aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/ufs/ufshcd.c
blob: 029da74bb2f5c1a0e43efd5ad7bd7d1dc521ec24 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
8293
8294
8295
8296
8297
8298
8299
8300
8301
8302
8303
8304
8305
8306
8307
8308
8309
8310
8311
8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
8324
8325
8326
8327
8328
8329
8330
8331
8332
8333
8334
8335
8336
8337
8338
8339
8340
8341
8342
8343
8344
8345
8346
8347
8348
8349
8350
8351
8352
8353
8354
8355
8356
8357
8358
8359
8360
8361
8362
8363
8364
8365
8366
8367
8368
8369
8370
8371
8372
8373
8374
8375
8376
8377
8378
8379
8380
8381
8382
8383
8384
8385
8386
8387
/*
 * Universal Flash Storage Host controller driver Core
 *
 * This code is based on drivers/scsi/ufs/ufshcd.c
 * Copyright (C) 2011-2013 Samsung India Software Operations
 * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
 *
 * Authors:
 *	Santosh Yaraganavi <santosh.sy@samsung.com>
 *	Vinayak Holikatti <h.vinayak@samsung.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * See the COPYING file in the top-level directory or visit
 * <http://www.gnu.org/licenses/gpl-2.0.html>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This program is provided "AS IS" and "WITH ALL FAULTS" and
 * without warranty of any kind. You are solely responsible for
 * determining the appropriateness of using and distributing
 * the program and assume all risks associated with your exercise
 * of rights with respect to the program, including but not limited
 * to infringement of third party rights, the risks and costs of
 * program errors, damage to or loss of data, programs or equipment,
 * and unavailability or interruption of operations. Under no
 * circumstances will the contributor of this Program be liable for
 * any damages of any kind arising from your use or distribution of
 * this program.
 *
 * The Linux Foundation chooses to take subject only to the GPLv2
 * license terms, and distributes only under these terms.
 */

#include <linux/async.h>
#include <linux/devfreq.h>
#include <linux/nls.h>
#include <linux/of.h>
#include <linux/bitfield.h>
#include "ufshcd.h"
#include "ufs_quirks.h"
#include "unipro.h"
#include "ufs-sysfs.h"
#include "ufs_bsg.h"

#define CREATE_TRACE_POINTS
#include <trace/events/ufs.h>

#define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
				 UTP_TASK_REQ_COMPL |\
				 UFSHCD_ERROR_MASK)
/* UIC command timeout, unit: ms */
#define UIC_CMD_TIMEOUT	500

/* NOP OUT retries waiting for NOP IN response */
#define NOP_OUT_RETRIES    10
/* Timeout after 30 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT    30 /* msecs */

/* Query request retries */
#define QUERY_REQ_RETRIES 3
/* Query request timeout */
#define QUERY_REQ_TIMEOUT 1500 /* 1.5 seconds */

/* Task management command timeout */
#define TM_CMD_TIMEOUT	100 /* msecs */

/* maximum number of retries for a general UIC command  */
#define UFS_UIC_COMMAND_RETRIES 3

/* maximum number of link-startup retries */
#define DME_LINKSTARTUP_RETRIES 3

/* Maximum retries for Hibern8 enter */
#define UIC_HIBERN8_ENTER_RETRIES 3

/* maximum number of reset retries before giving up */
#define MAX_HOST_RESET_RETRIES 5

/* Expose the flag value from utp_upiu_query.value */
#define MASK_QUERY_UPIU_FLAG_LOC 0xFF

/* Interrupt aggregation default timeout, unit: 40us */
#define INT_AGGR_DEF_TO	0x02

#define ufshcd_toggle_vreg(_dev, _vreg, _on)				\
	({                                                              \
		int _ret;                                               \
		if (_on)                                                \
			_ret = ufshcd_enable_vreg(_dev, _vreg);         \
		else                                                    \
			_ret = ufshcd_disable_vreg(_dev, _vreg);        \
		_ret;                                                   \
	})

#define ufshcd_hex_dump(prefix_str, buf, len) do {                       \
	size_t __len = (len);                                            \
	print_hex_dump(KERN_ERR, prefix_str,                             \
		       __len > 4 ? DUMP_PREFIX_OFFSET : DUMP_PREFIX_NONE,\
		       16, 4, buf, __len, false);                        \
} while (0)

int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
		     const char *prefix)
{
	u32 *regs;
	size_t pos;

	if (offset % 4 != 0 || len % 4 != 0) /* keep readl happy */
		return -EINVAL;

	regs = kzalloc(len, GFP_KERNEL);
	if (!regs)
		return -ENOMEM;

	for (pos = 0; pos < len; pos += 4)
		regs[pos / 4] = ufshcd_readl(hba, offset + pos);

	ufshcd_hex_dump(prefix, regs, len);
	kfree(regs);

	return 0;
}
EXPORT_SYMBOL_GPL(ufshcd_dump_regs);

enum {
	UFSHCD_MAX_CHANNEL	= 0,
	UFSHCD_MAX_ID		= 1,
	UFSHCD_CMD_PER_LUN	= 32,
	UFSHCD_CAN_QUEUE	= 32,
};

/* UFSHCD states */
enum {
	UFSHCD_STATE_RESET,
	UFSHCD_STATE_ERROR,
	UFSHCD_STATE_OPERATIONAL,
	UFSHCD_STATE_EH_SCHEDULED,
};

/* UFSHCD error handling flags */
enum {
	UFSHCD_EH_IN_PROGRESS = (1 << 0),
};

/* UFSHCD UIC layer error flags */
enum {
	UFSHCD_UIC_DL_PA_INIT_ERROR = (1 << 0), /* Data link layer error */
	UFSHCD_UIC_DL_NAC_RECEIVED_ERROR = (1 << 1), /* Data link layer error */
	UFSHCD_UIC_DL_TCx_REPLAY_ERROR = (1 << 2), /* Data link layer error */
	UFSHCD_UIC_NL_ERROR = (1 << 3), /* Network layer error */
	UFSHCD_UIC_TL_ERROR = (1 << 4), /* Transport Layer error */
	UFSHCD_UIC_DME_ERROR = (1 << 5), /* DME error */
};

#define ufshcd_set_eh_in_progress(h) \
	((h)->eh_flags |= UFSHCD_EH_IN_PROGRESS)
#define ufshcd_eh_in_progress(h) \
	((h)->eh_flags & UFSHCD_EH_IN_PROGRESS)
#define ufshcd_clear_eh_in_progress(h) \
	((h)->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)

#define ufshcd_set_ufs_dev_active(h) \
	((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
#define ufshcd_set_ufs_dev_sleep(h) \
	((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
#define ufshcd_set_ufs_dev_poweroff(h) \
	((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
#define ufshcd_is_ufs_dev_active(h) \
	((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
#define ufshcd_is_ufs_dev_sleep(h) \
	((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
#define ufshcd_is_ufs_dev_poweroff(h) \
	((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)

struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
	{UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	{UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE},
	{UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE},
	{UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE},
};

static inline enum ufs_dev_pwr_mode
ufs_get_pm_lvl_to_dev_pwr_mode(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].dev_state;
}

static inline enum uic_link_state
ufs_get_pm_lvl_to_link_pwr_state(enum ufs_pm_level lvl)
{
	return ufs_pm_lvl_states[lvl].link_state;
}

static inline enum ufs_pm_level
ufs_get_desired_pm_lvl_for_dev_link_state(enum ufs_dev_pwr_mode dev_state,
					enum uic_link_state link_state)
{
	enum ufs_pm_level lvl;

	for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++) {
		if ((ufs_pm_lvl_states[lvl].dev_state == dev_state) &&
			(ufs_pm_lvl_states[lvl].link_state == link_state))
			return lvl;
	}

	/* if no match found, return the level 0 */
	return UFS_PM_LVL_0;
}

static struct ufs_dev_fix ufs_fixups[] = {
	/* UFS cards deviations table */
	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS),
	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE),
	UFS_FIX(UFS_VENDOR_TOSHIBA, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
	UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9C8KBADG",
		UFS_DEVICE_QUIRK_PA_TACTIVATE),
	UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9D8KBADG",
		UFS_DEVICE_QUIRK_PA_TACTIVATE),
	UFS_FIX(UFS_VENDOR_SKHYNIX, UFS_ANY_MODEL,
		UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME),
	UFS_FIX(UFS_VENDOR_SKHYNIX, "hB8aL1" /*H28U62301AMR*/,
		UFS_DEVICE_QUIRK_HOST_VS_DEBUGSAVECONFIGTIME),

	END_FIX
};

static void ufshcd_tmc_handler(struct ufs_hba *hba);
static void ufshcd_async_scan(void *data, async_cookie_t cookie);
static int ufshcd_reset_and_restore(struct ufs_hba *hba);
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd);
static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag);
static void ufshcd_hba_exit(struct ufs_hba *hba);
static int ufshcd_probe_hba(struct ufs_hba *hba);
static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
				 bool skip_ref_clk);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba);
static void ufshcd_resume_clkscaling(struct ufs_hba *hba);
static void ufshcd_suspend_clkscaling(struct ufs_hba *hba);
static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba);
static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
static irqreturn_t ufshcd_intr(int irq, void *__hba);
static int ufshcd_change_power_mode(struct ufs_hba *hba,
			     struct ufs_pa_layer_attr *pwr_mode);
static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag)
{
	return tag >= 0 && tag < hba->nutrs;
}

static inline int ufshcd_enable_irq(struct ufs_hba *hba)
{
	int ret = 0;

	if (!hba->is_irq_enabled) {
		ret = request_irq(hba->irq, ufshcd_intr, IRQF_SHARED, UFSHCD,
				hba);
		if (ret)
			dev_err(hba->dev, "%s: request_irq failed, ret=%d\n",
				__func__, ret);
		hba->is_irq_enabled = true;
	}

	return ret;
}

static inline void ufshcd_disable_irq(struct ufs_hba *hba)
{
	if (hba->is_irq_enabled) {
		free_irq(hba->irq, hba);
		hba->is_irq_enabled = false;
	}
}

static void ufshcd_scsi_unblock_requests(struct ufs_hba *hba)
{
	if (atomic_dec_and_test(&hba->scsi_block_reqs_cnt))
		scsi_unblock_requests(hba->host);
}

static void ufshcd_scsi_block_requests(struct ufs_hba *hba)
{
	if (atomic_inc_return(&hba->scsi_block_reqs_cnt) == 1)
		scsi_block_requests(hba->host);
}

/* replace non-printable or non-ASCII characters with spaces */
static inline void ufshcd_remove_non_printable(char *val)
{
	if (!val)
		return;

	if (*val < 0x20 || *val > 0x7e)
		*val = ' ';
}

static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
		const char *str)
{
	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;

	trace_ufshcd_upiu(dev_name(hba->dev), str, &rq->header, &rq->sc.cdb);
}

static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba, unsigned int tag,
		const char *str)
{
	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;

	trace_ufshcd_upiu(dev_name(hba->dev), str, &rq->header, &rq->qr);
}

static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,
		const char *str)
{
	int off = (int)tag - hba->nutrs;
	struct utp_task_req_desc *descp = &hba->utmrdl_base_addr[off];

	trace_ufshcd_upiu(dev_name(hba->dev), str, &descp->req_header,
			&descp->input_param1);
}

static void ufshcd_add_command_trace(struct ufs_hba *hba,
		unsigned int tag, const char *str)
{
	sector_t lba = -1;
	u8 opcode = 0;
	u32 intr, doorbell;
	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
	int transfer_len = -1;

	if (!trace_ufshcd_command_enabled()) {
		/* trace UPIU W/O tracing command */
		if (lrbp->cmd)
			ufshcd_add_cmd_upiu_trace(hba, tag, str);
		return;
	}

	if (lrbp->cmd) { /* data phase exists */
		/* trace UPIU also */
		ufshcd_add_cmd_upiu_trace(hba, tag, str);
		opcode = (u8)(*lrbp->cmd->cmnd);
		if ((opcode == READ_10) || (opcode == WRITE_10)) {
			/*
			 * Currently we only fully trace read(10) and write(10)
			 * commands
			 */
			if (lrbp->cmd->request && lrbp->cmd->request->bio)
				lba =
				  lrbp->cmd->request->bio->bi_iter.bi_sector;
			transfer_len = be32_to_cpu(
				lrbp->ucd_req_ptr->sc.exp_data_transfer_len);
		}
	}

	intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
	doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	trace_ufshcd_command(dev_name(hba->dev), str, tag,
				doorbell, transfer_len, intr, lba, opcode);
}

static void ufshcd_print_clk_freqs(struct ufs_hba *hba)
{
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;

	if (list_empty(head))
		return;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk) && clki->min_freq &&
				clki->max_freq)
			dev_err(hba->dev, "clk: %s, rate: %u\n",
					clki->name, clki->curr_freq);
	}
}

static void ufshcd_print_uic_err_hist(struct ufs_hba *hba,
		struct ufs_uic_err_reg_hist *err_hist, char *err_name)
{
	int i;
	bool found = false;

	for (i = 0; i < UIC_ERR_REG_HIST_LENGTH; i++) {
		int p = (i + err_hist->pos) % UIC_ERR_REG_HIST_LENGTH;

		if (err_hist->reg[p] == 0)
			continue;
		dev_err(hba->dev, "%s[%d] = 0x%x at %lld us\n", err_name, i,
			err_hist->reg[p], ktime_to_us(err_hist->tstamp[p]));
		found = true;
	}

	if (!found)
		dev_err(hba->dev, "No record of %s uic errors\n", err_name);
}

static void ufshcd_print_host_regs(struct ufs_hba *hba)
{
	ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");
	dev_err(hba->dev, "hba->ufs_version = 0x%x, hba->capabilities = 0x%x\n",
		hba->ufs_version, hba->capabilities);
	dev_err(hba->dev,
		"hba->outstanding_reqs = 0x%x, hba->outstanding_tasks = 0x%x\n",
		(u32)hba->outstanding_reqs, (u32)hba->outstanding_tasks);
	dev_err(hba->dev,
		"last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt = %d\n",
		ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp),
		hba->ufs_stats.hibern8_exit_cnt);

	ufshcd_print_uic_err_hist(hba, &hba->ufs_stats.pa_err, "pa_err");
	ufshcd_print_uic_err_hist(hba, &hba->ufs_stats.dl_err, "dl_err");
	ufshcd_print_uic_err_hist(hba, &hba->ufs_stats.nl_err, "nl_err");
	ufshcd_print_uic_err_hist(hba, &hba->ufs_stats.tl_err, "tl_err");
	ufshcd_print_uic_err_hist(hba, &hba->ufs_stats.dme_err, "dme_err");

	ufshcd_print_clk_freqs(hba);

	if (hba->vops && hba->vops->dbg_register_dump)
		hba->vops->dbg_register_dump(hba);
}

static
void ufshcd_print_trs(struct ufs_hba *hba, unsigned long bitmap, bool pr_prdt)
{
	struct ufshcd_lrb *lrbp;
	int prdt_length;
	int tag;

	for_each_set_bit(tag, &bitmap, hba->nutrs) {
		lrbp = &hba->lrb[tag];

		dev_err(hba->dev, "UPIU[%d] - issue time %lld us\n",
				tag, ktime_to_us(lrbp->issue_time_stamp));
		dev_err(hba->dev, "UPIU[%d] - complete time %lld us\n",
				tag, ktime_to_us(lrbp->compl_time_stamp));
		dev_err(hba->dev,
			"UPIU[%d] - Transfer Request Descriptor phys@0x%llx\n",
			tag, (u64)lrbp->utrd_dma_addr);

		ufshcd_hex_dump("UPIU TRD: ", lrbp->utr_descriptor_ptr,
				sizeof(struct utp_transfer_req_desc));
		dev_err(hba->dev, "UPIU[%d] - Request UPIU phys@0x%llx\n", tag,
			(u64)lrbp->ucd_req_dma_addr);
		ufshcd_hex_dump("UPIU REQ: ", lrbp->ucd_req_ptr,
				sizeof(struct utp_upiu_req));
		dev_err(hba->dev, "UPIU[%d] - Response UPIU phys@0x%llx\n", tag,
			(u64)lrbp->ucd_rsp_dma_addr);
		ufshcd_hex_dump("UPIU RSP: ", lrbp->ucd_rsp_ptr,
				sizeof(struct utp_upiu_rsp));

		prdt_length = le16_to_cpu(
			lrbp->utr_descriptor_ptr->prd_table_length);
		dev_err(hba->dev,
			"UPIU[%d] - PRDT - %d entries  phys@0x%llx\n",
			tag, prdt_length,
			(u64)lrbp->ucd_prdt_dma_addr);

		if (pr_prdt)
			ufshcd_hex_dump("UPIU PRDT: ", lrbp->ucd_prdt_ptr,
				sizeof(struct ufshcd_sg_entry) * prdt_length);
	}
}

static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap)
{
	int tag;

	for_each_set_bit(tag, &bitmap, hba->nutmrs) {
		struct utp_task_req_desc *tmrdp = &hba->utmrdl_base_addr[tag];

		dev_err(hba->dev, "TM[%d] - Task Management Header\n", tag);
		ufshcd_hex_dump("", tmrdp, sizeof(*tmrdp));
	}
}

static void ufshcd_print_host_state(struct ufs_hba *hba)
{
	dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state);
	dev_err(hba->dev, "lrb in use=0x%lx, outstanding reqs=0x%lx tasks=0x%lx\n",
		hba->lrb_in_use, hba->outstanding_reqs, hba->outstanding_tasks);
	dev_err(hba->dev, "saved_err=0x%x, saved_uic_err=0x%x\n",
		hba->saved_err, hba->saved_uic_err);
	dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	dev_err(hba->dev, "PM in progress=%d, sys. suspended=%d\n",
		hba->pm_op_in_progress, hba->is_sys_suspended);
	dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
		hba->auto_bkops_enabled, hba->host->host_self_blocked);
	dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state);
	dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n",
		hba->eh_flags, hba->req_abort_count);
	dev_err(hba->dev, "Host capabilities=0x%x, caps=0x%x\n",
		hba->capabilities, hba->caps);
	dev_err(hba->dev, "quirks=0x%x, dev. quirks=0x%x\n", hba->quirks,
		hba->dev_quirks);
}

/**
 * ufshcd_print_pwr_info - print power params as saved in hba
 * power info
 * @hba: per-adapter instance
 */
static void ufshcd_print_pwr_info(struct ufs_hba *hba)
{
	static const char * const names[] = {
		"INVALID MODE",
		"FAST MODE",
		"SLOW_MODE",
		"INVALID MODE",
		"FASTAUTO_MODE",
		"SLOWAUTO_MODE",
		"INVALID MODE",
	};

	dev_err(hba->dev, "%s:[RX, TX]: gear=[%d, %d], lane[%d, %d], pwr[%s, %s], rate = %d\n",
		 __func__,
		 hba->pwr_info.gear_rx, hba->pwr_info.gear_tx,
		 hba->pwr_info.lane_rx, hba->pwr_info.lane_tx,
		 names[hba->pwr_info.pwr_rx],
		 names[hba->pwr_info.pwr_tx],
		 hba->pwr_info.hs_rate);
}

/*
 * ufshcd_wait_for_register - wait for register value to change
 * @hba - per-adapter interface
 * @reg - mmio register offset
 * @mask - mask to apply to read register value
 * @val - wait condition
 * @interval_us - polling interval in microsecs
 * @timeout_ms - timeout in millisecs
 * @can_sleep - perform sleep or just spin
 *
 * Returns -ETIMEDOUT on error, zero on success
 */
int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
				u32 val, unsigned long interval_us,
				unsigned long timeout_ms, bool can_sleep)
{
	int err = 0;
	unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);

	/* ignore bits that we don't intend to wait on */
	val = val & mask;

	while ((ufshcd_readl(hba, reg) & mask) != val) {
		if (can_sleep)
			usleep_range(interval_us, interval_us + 50);
		else
			udelay(interval_us);
		if (time_after(jiffies, timeout)) {
			if ((ufshcd_readl(hba, reg) & mask) != val)
				err = -ETIMEDOUT;
			break;
		}
	}

	return err;
}

/**
 * ufshcd_get_intr_mask - Get the interrupt bit mask
 * @hba: Pointer to adapter instance
 *
 * Returns interrupt bit mask per version
 */
static inline u32 ufshcd_get_intr_mask(struct ufs_hba *hba)
{
	u32 intr_mask = 0;

	switch (hba->ufs_version) {
	case UFSHCI_VERSION_10:
		intr_mask = INTERRUPT_MASK_ALL_VER_10;
		break;
	case UFSHCI_VERSION_11:
	case UFSHCI_VERSION_20:
		intr_mask = INTERRUPT_MASK_ALL_VER_11;
		break;
	case UFSHCI_VERSION_21:
	default:
		intr_mask = INTERRUPT_MASK_ALL_VER_21;
		break;
	}

	return intr_mask;
}

/**
 * ufshcd_get_ufs_version - Get the UFS version supported by the HBA
 * @hba: Pointer to adapter instance
 *
 * Returns UFSHCI version supported by the controller
 */
static inline u32 ufshcd_get_ufs_version(struct ufs_hba *hba)
{
	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION)
		return ufshcd_vops_get_ufs_hci_version(hba);

	return ufshcd_readl(hba, REG_UFS_VERSION);
}

/**
 * ufshcd_is_device_present - Check if any device connected to
 *			      the host controller
 * @hba: pointer to adapter instance
 *
 * Returns true if device present, false if no device detected
 */
static inline bool ufshcd_is_device_present(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
						DEVICE_PRESENT) ? true : false;
}

/**
 * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status
 * @lrbp: pointer to local command reference block
 *
 * This function is used to get the OCS field from UTRD
 * Returns the OCS field in the UTRD
 */
static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp)
{
	return le32_to_cpu(lrbp->utr_descriptor_ptr->header.dword_2) & MASK_OCS;
}

/**
 * ufshcd_get_tm_free_slot - get a free slot for task management request
 * @hba: per adapter instance
 * @free_slot: pointer to variable with available slot value
 *
 * Get a free tag and lock it until ufshcd_put_tm_slot() is called.
 * Returns 0 if free slot is not available, else return 1 with tag value
 * in @free_slot.
 */
static bool ufshcd_get_tm_free_slot(struct ufs_hba *hba, int *free_slot)
{
	int tag;
	bool ret = false;

	if (!free_slot)
		goto out;

	do {
		tag = find_first_zero_bit(&hba->tm_slots_in_use, hba->nutmrs);
		if (tag >= hba->nutmrs)
			goto out;
	} while (test_and_set_bit_lock(tag, &hba->tm_slots_in_use));

	*free_slot = tag;
	ret = true;
out:
	return ret;
}

static inline void ufshcd_put_tm_slot(struct ufs_hba *hba, int slot)
{
	clear_bit_unlock(slot, &hba->tm_slots_in_use);
}

/**
 * ufshcd_utrl_clear - Clear a bit in UTRLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
{
	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
		ufshcd_writel(hba, (1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
	else
		ufshcd_writel(hba, ~(1 << pos),
				REG_UTP_TRANSFER_REQ_LIST_CLEAR);
}

/**
 * ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
 * @hba: per adapter instance
 * @pos: position of the bit to be cleared
 */
static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
{
	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
		ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
	else
		ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
}

/**
 * ufshcd_outstanding_req_clear - Clear a bit in outstanding request field
 * @hba: per adapter instance
 * @tag: position of the bit to be cleared
 */
static inline void ufshcd_outstanding_req_clear(struct ufs_hba *hba, int tag)
{
	__clear_bit(tag, &hba->outstanding_reqs);
}

/**
 * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
 * @reg: Register value of host controller status
 *
 * Returns integer, 0 on Success and positive value if failed
 */
static inline int ufshcd_get_lists_status(u32 reg)
{
	return !((reg & UFSHCD_STATUS_READY) == UFSHCD_STATUS_READY);
}

/**
 * ufshcd_get_uic_cmd_result - Get the UIC command result
 * @hba: Pointer to adapter instance
 *
 * This function gets the result of UIC command completion
 * Returns 0 on success, non zero value on error
 */
static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
{
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_2) &
	       MASK_UIC_COMMAND_RESULT;
}

/**
 * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
 * @hba: Pointer to adapter instance
 *
 * This function gets UIC command argument3
 * Returns 0 on success, non zero value on error
 */
static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
{
	return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
}

/**
 * ufshcd_get_req_rsp - returns the TR response transaction type
 * @ucd_rsp_ptr: pointer to response UPIU
 */
static inline int
ufshcd_get_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24;
}

/**
 * ufshcd_get_rsp_upiu_result - Get the result from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * This function gets the response status and scsi_status from response UPIU
 * Returns the response result code.
 */
static inline int
ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT;
}

/*
 * ufshcd_get_rsp_upiu_data_seg_len - Get the data segment length
 *				from response UPIU
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * Return the data segment length.
 */
static inline unsigned int
ufshcd_get_rsp_upiu_data_seg_len(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
		MASK_RSP_UPIU_DATA_SEG_LEN;
}

/**
 * ufshcd_is_exception_event - Check if the device raised an exception event
 * @ucd_rsp_ptr: pointer to response UPIU
 *
 * The function checks if the device raised an exception event indicated in
 * the Device Information field of response UPIU.
 *
 * Returns true if exception is raised, false otherwise.
 */
static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
{
	return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
			MASK_RSP_EXCEPTION_EVENT ? true : false;
}

/**
 * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
 * @hba: per adapter instance
 */
static inline void
ufshcd_reset_intr_aggr(struct ufs_hba *hba)
{
	ufshcd_writel(hba, INT_AGGR_ENABLE |
		      INT_AGGR_COUNTER_AND_TIMER_RESET,
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
 * @hba: per adapter instance
 * @cnt: Interrupt aggregation counter threshold
 * @tmout: Interrupt aggregation timeout value
 */
static inline void
ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
{
	ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
		      INT_AGGR_COUNTER_THLD_VAL(cnt) |
		      INT_AGGR_TIMEOUT_VAL(tmout),
		      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_disable_intr_aggr - Disables interrupt aggregation.
 * @hba: per adapter instance
 */
static inline void ufshcd_disable_intr_aggr(struct ufs_hba *hba)
{
	ufshcd_writel(hba, 0, REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
}

/**
 * ufshcd_enable_run_stop_reg - Enable run-stop registers,
 *			When run-stop registers are set to 1, it indicates the
 *			host controller that it can process the requests
 * @hba: per adapter instance
 */
static void ufshcd_enable_run_stop_reg(struct ufs_hba *hba)
{
	ufshcd_writel(hba, UTP_TASK_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TASK_REQ_LIST_RUN_STOP);
	ufshcd_writel(hba, UTP_TRANSFER_REQ_LIST_RUN_STOP_BIT,
		      REG_UTP_TRANSFER_REQ_LIST_RUN_STOP);
}

/**
 * ufshcd_hba_start - Start controller initialization sequence
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_start(struct ufs_hba *hba)
{
	ufshcd_writel(hba, CONTROLLER_ENABLE, REG_CONTROLLER_ENABLE);
}

/**
 * ufshcd_is_hba_active - Get controller state
 * @hba: per adapter instance
 *
 * Returns false if controller is active, true otherwise
 */
static inline bool ufshcd_is_hba_active(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & CONTROLLER_ENABLE)
		? false : true;
}

u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
{
	/* HCI version 1.0 and 1.1 supports UniPro 1.41 */
	if ((hba->ufs_version == UFSHCI_VERSION_10) ||
	    (hba->ufs_version == UFSHCI_VERSION_11))
		return UFS_UNIPRO_VER_1_41;
	else
		return UFS_UNIPRO_VER_1_6;
}
EXPORT_SYMBOL(ufshcd_get_local_unipro_ver);

static bool ufshcd_is_unipro_pa_params_tuning_req(struct ufs_hba *hba)
{
	/*
	 * If both host and device support UniPro ver1.6 or later, PA layer
	 * parameters tuning happens during link startup itself.
	 *
	 * We can manually tune PA layer parameters if either host or device
	 * doesn't support UniPro ver 1.6 or later. But to keep manual tuning
	 * logic simple, we will only do manual tuning if local unipro version
	 * doesn't support ver1.6 or later.
	 */
	if (ufshcd_get_local_unipro_ver(hba) < UFS_UNIPRO_VER_1_6)
		return true;
	else
		return false;
}

static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;
	ktime_t start = ktime_get();
	bool clk_state_changed = false;

	if (list_empty(head))
		goto out;

	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
	if (ret)
		return ret;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
			if (scale_up && clki->max_freq) {
				if (clki->curr_freq == clki->max_freq)
					continue;

				clk_state_changed = true;
				ret = clk_set_rate(clki->clk, clki->max_freq);
				if (ret) {
					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
						__func__, clki->name,
						clki->max_freq, ret);
					break;
				}
				trace_ufshcd_clk_scaling(dev_name(hba->dev),
						"scaled up", clki->name,
						clki->curr_freq,
						clki->max_freq);

				clki->curr_freq = clki->max_freq;

			} else if (!scale_up && clki->min_freq) {
				if (clki->curr_freq == clki->min_freq)
					continue;

				clk_state_changed = true;
				ret = clk_set_rate(clki->clk, clki->min_freq);
				if (ret) {
					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
						__func__, clki->name,
						clki->min_freq, ret);
					break;
				}
				trace_ufshcd_clk_scaling(dev_name(hba->dev),
						"scaled down", clki->name,
						clki->curr_freq,
						clki->min_freq);
				clki->curr_freq = clki->min_freq;
			}
		}
		dev_dbg(hba->dev, "%s: clk: %s, rate: %lu\n", __func__,
				clki->name, clk_get_rate(clki->clk));
	}

	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);

out:
	if (clk_state_changed)
		trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
			(scale_up ? "up" : "down"),
			ktime_to_us(ktime_sub(ktime_get(), start)), ret);
	return ret;
}

/**
 * ufshcd_is_devfreq_scaling_required - check if scaling is required or not
 * @hba: per adapter instance
 * @scale_up: True if scaling up and false if scaling down
 *
 * Returns true if scaling is required, false otherwise.
 */
static bool ufshcd_is_devfreq_scaling_required(struct ufs_hba *hba,
					       bool scale_up)
{
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;

	if (list_empty(head))
		return false;

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
			if (scale_up && clki->max_freq) {
				if (clki->curr_freq == clki->max_freq)
					continue;
				return true;
			} else if (!scale_up && clki->min_freq) {
				if (clki->curr_freq == clki->min_freq)
					continue;
				return true;
			}
		}
	}

	return false;
}

static int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba,
					u64 wait_timeout_us)
{
	unsigned long flags;
	int ret = 0;
	u32 tm_doorbell;
	u32 tr_doorbell;
	bool timeout = false, do_last_check = false;
	ktime_t start;

	ufshcd_hold(hba, false);
	spin_lock_irqsave(hba->host->host_lock, flags);
	/*
	 * Wait for all the outstanding tasks/transfer requests.
	 * Verify by checking the doorbell registers are clear.
	 */
	start = ktime_get();
	do {
		if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL) {
			ret = -EBUSY;
			goto out;
		}

		tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
		tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
		if (!tm_doorbell && !tr_doorbell) {
			timeout = false;
			break;
		} else if (do_last_check) {
			break;
		}

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		schedule();
		if (ktime_to_us(ktime_sub(ktime_get(), start)) >
		    wait_timeout_us) {
			timeout = true;
			/*
			 * We might have scheduled out for long time so make
			 * sure to check if doorbells are cleared by this time
			 * or not.
			 */
			do_last_check = true;
		}
		spin_lock_irqsave(hba->host->host_lock, flags);
	} while (tm_doorbell || tr_doorbell);

	if (timeout) {
		dev_err(hba->dev,
			"%s: timedout waiting for doorbell to clear (tm=0x%x, tr=0x%x)\n",
			__func__, tm_doorbell, tr_doorbell);
		ret = -EBUSY;
	}
out:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_release(hba);
	return ret;
}

/**
 * ufshcd_scale_gear - scale up/down UFS gear
 * @hba: per adapter instance
 * @scale_up: True for scaling up gear and false for scaling down
 *
 * Returns 0 for success,
 * Returns -EBUSY if scaling can't happen at this time
 * Returns non-zero for any other errors
 */
static int ufshcd_scale_gear(struct ufs_hba *hba, bool scale_up)
{
	#define UFS_MIN_GEAR_TO_SCALE_DOWN	UFS_HS_G1
	int ret = 0;
	struct ufs_pa_layer_attr new_pwr_info;

	if (scale_up) {
		memcpy(&new_pwr_info, &hba->clk_scaling.saved_pwr_info.info,
		       sizeof(struct ufs_pa_layer_attr));
	} else {
		memcpy(&new_pwr_info, &hba->pwr_info,
		       sizeof(struct ufs_pa_layer_attr));

		if (hba->pwr_info.gear_tx > UFS_MIN_GEAR_TO_SCALE_DOWN
		    || hba->pwr_info.gear_rx > UFS_MIN_GEAR_TO_SCALE_DOWN) {
			/* save the current power mode */
			memcpy(&hba->clk_scaling.saved_pwr_info.info,
				&hba->pwr_info,
				sizeof(struct ufs_pa_layer_attr));

			/* scale down gear */
			new_pwr_info.gear_tx = UFS_MIN_GEAR_TO_SCALE_DOWN;
			new_pwr_info.gear_rx = UFS_MIN_GEAR_TO_SCALE_DOWN;
		}
	}

	/* check if the power mode needs to be changed or not? */
	ret = ufshcd_change_power_mode(hba, &new_pwr_info);

	if (ret)
		dev_err(hba->dev, "%s: failed err %d, old gear: (tx %d rx %d), new gear: (tx %d rx %d)",
			__func__, ret,
			hba->pwr_info.gear_tx, hba->pwr_info.gear_rx,
			new_pwr_info.gear_tx, new_pwr_info.gear_rx);

	return ret;
}

static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba)
{
	#define DOORBELL_CLR_TOUT_US		(1000 * 1000) /* 1 sec */
	int ret = 0;
	/*
	 * make sure that there are no outstanding requests when
	 * clock scaling is in progress
	 */
	ufshcd_scsi_block_requests(hba);
	down_write(&hba->clk_scaling_lock);
	if (ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) {
		ret = -EBUSY;
		up_write(&hba->clk_scaling_lock);
		ufshcd_scsi_unblock_requests(hba);
	}

	return ret;
}

static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba)
{
	up_write(&hba->clk_scaling_lock);
	ufshcd_scsi_unblock_requests(hba);
}

/**
 * ufshcd_devfreq_scale - scale up/down UFS clocks and gear
 * @hba: per adapter instance
 * @scale_up: True for scaling up and false for scalin down
 *
 * Returns 0 for success,
 * Returns -EBUSY if scaling can't happen at this time
 * Returns non-zero for any other errors
 */
static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
{
	int ret = 0;

	/* let's not get into low power until clock scaling is completed */
	ufshcd_hold(hba, false);

	ret = ufshcd_clock_scaling_prepare(hba);
	if (ret)
		return ret;

	/* scale down the gear before scaling down clocks */
	if (!scale_up) {
		ret = ufshcd_scale_gear(hba, false);
		if (ret)
			goto out;
	}

	ret = ufshcd_scale_clks(hba, scale_up);
	if (ret) {
		if (!scale_up)
			ufshcd_scale_gear(hba, true);
		goto out;
	}

	/* scale up the gear after scaling up clocks */
	if (scale_up) {
		ret = ufshcd_scale_gear(hba, true);
		if (ret) {
			ufshcd_scale_clks(hba, false);
			goto out;
		}
	}

	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);

out:
	ufshcd_clock_scaling_unprepare(hba);
	ufshcd_release(hba);
	return ret;
}

static void ufshcd_clk_scaling_suspend_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
					   clk_scaling.suspend_work);
	unsigned long irq_flags;

	spin_lock_irqsave(hba->host->host_lock, irq_flags);
	if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		return;
	}
	hba->clk_scaling.is_suspended = true;
	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

	__ufshcd_suspend_clkscaling(hba);
}

static void ufshcd_clk_scaling_resume_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
					   clk_scaling.resume_work);
	unsigned long irq_flags;

	spin_lock_irqsave(hba->host->host_lock, irq_flags);
	if (!hba->clk_scaling.is_suspended) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		return;
	}
	hba->clk_scaling.is_suspended = false;
	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

	devfreq_resume_device(hba->devfreq);
}

static int ufshcd_devfreq_target(struct device *dev,
				unsigned long *freq, u32 flags)
{
	int ret = 0;
	struct ufs_hba *hba = dev_get_drvdata(dev);
	ktime_t start;
	bool scale_up, sched_clk_scaling_suspend_work = false;
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;
	unsigned long irq_flags;

	if (!ufshcd_is_clkscaling_supported(hba))
		return -EINVAL;

	spin_lock_irqsave(hba->host->host_lock, irq_flags);
	if (ufshcd_eh_in_progress(hba)) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		return 0;
	}

	if (!hba->clk_scaling.active_reqs)
		sched_clk_scaling_suspend_work = true;

	if (list_empty(clk_list)) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		goto out;
	}

	clki = list_first_entry(&hba->clk_list_head, struct ufs_clk_info, list);
	scale_up = (*freq == clki->max_freq) ? true : false;
	if (!ufshcd_is_devfreq_scaling_required(hba, scale_up)) {
		spin_unlock_irqrestore(hba->host->host_lock, irq_flags);
		ret = 0;
		goto out; /* no state change required */
	}
	spin_unlock_irqrestore(hba->host->host_lock, irq_flags);

	start = ktime_get();
	ret = ufshcd_devfreq_scale(hba, scale_up);

	trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
		(scale_up ? "up" : "down"),
		ktime_to_us(ktime_sub(ktime_get(), start)), ret);

out:
	if (sched_clk_scaling_suspend_work)
		queue_work(hba->clk_scaling.workq,
			   &hba->clk_scaling.suspend_work);

	return ret;
}


static int ufshcd_devfreq_get_dev_status(struct device *dev,
		struct devfreq_dev_status *stat)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;
	unsigned long flags;

	if (!ufshcd_is_clkscaling_supported(hba))
		return -EINVAL;

	memset(stat, 0, sizeof(*stat));

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!scaling->window_start_t)
		goto start_window;

	if (scaling->is_busy_started)
		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
					scaling->busy_start_t));

	stat->total_time = jiffies_to_usecs((long)jiffies -
				(long)scaling->window_start_t);
	stat->busy_time = scaling->tot_busy_t;
start_window:
	scaling->window_start_t = jiffies;
	scaling->tot_busy_t = 0;

	if (hba->outstanding_reqs) {
		scaling->busy_start_t = ktime_get();
		scaling->is_busy_started = true;
	} else {
		scaling->busy_start_t = 0;
		scaling->is_busy_started = false;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return 0;
}

static struct devfreq_dev_profile ufs_devfreq_profile = {
	.polling_ms	= 100,
	.target		= ufshcd_devfreq_target,
	.get_dev_status	= ufshcd_devfreq_get_dev_status,
};

static int ufshcd_devfreq_init(struct ufs_hba *hba)
{
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;
	struct devfreq *devfreq;
	int ret;

	/* Skip devfreq if we don't have any clocks in the list */
	if (list_empty(clk_list))
		return 0;

	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
	dev_pm_opp_add(hba->dev, clki->min_freq, 0);
	dev_pm_opp_add(hba->dev, clki->max_freq, 0);

	devfreq = devfreq_add_device(hba->dev,
			&ufs_devfreq_profile,
			DEVFREQ_GOV_SIMPLE_ONDEMAND,
			NULL);
	if (IS_ERR(devfreq)) {
		ret = PTR_ERR(devfreq);
		dev_err(hba->dev, "Unable to register with devfreq %d\n", ret);

		dev_pm_opp_remove(hba->dev, clki->min_freq);
		dev_pm_opp_remove(hba->dev, clki->max_freq);
		return ret;
	}

	hba->devfreq = devfreq;

	return 0;
}

static void ufshcd_devfreq_remove(struct ufs_hba *hba)
{
	struct list_head *clk_list = &hba->clk_list_head;
	struct ufs_clk_info *clki;

	if (!hba->devfreq)
		return;

	devfreq_remove_device(hba->devfreq);
	hba->devfreq = NULL;

	clki = list_first_entry(clk_list, struct ufs_clk_info, list);
	dev_pm_opp_remove(hba->dev, clki->min_freq);
	dev_pm_opp_remove(hba->dev, clki->max_freq);
}

static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
	unsigned long flags;

	devfreq_suspend_device(hba->devfreq);
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_scaling.window_start_t = 0;
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

static void ufshcd_suspend_clkscaling(struct ufs_hba *hba)
{
	unsigned long flags;
	bool suspend = false;

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!hba->clk_scaling.is_suspended) {
		suspend = true;
		hba->clk_scaling.is_suspended = true;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (suspend)
		__ufshcd_suspend_clkscaling(hba);
}

static void ufshcd_resume_clkscaling(struct ufs_hba *hba)
{
	unsigned long flags;
	bool resume = false;

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_scaling.is_suspended) {
		resume = true;
		hba->clk_scaling.is_suspended = false;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (resume)
		devfreq_resume_device(hba->devfreq);
}

static ssize_t ufshcd_clkscale_enable_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n", hba->clk_scaling.is_allowed);
}

static ssize_t ufshcd_clkscale_enable_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	u32 value;
	int err;

	if (kstrtou32(buf, 0, &value))
		return -EINVAL;

	value = !!value;
	if (value == hba->clk_scaling.is_allowed)
		goto out;

	pm_runtime_get_sync(hba->dev);
	ufshcd_hold(hba, false);

	cancel_work_sync(&hba->clk_scaling.suspend_work);
	cancel_work_sync(&hba->clk_scaling.resume_work);

	hba->clk_scaling.is_allowed = value;

	if (value) {
		ufshcd_resume_clkscaling(hba);
	} else {
		ufshcd_suspend_clkscaling(hba);
		err = ufshcd_devfreq_scale(hba, true);
		if (err)
			dev_err(hba->dev, "%s: failed to scale clocks up %d\n",
					__func__, err);
	}

	ufshcd_release(hba);
	pm_runtime_put_sync(hba->dev);
out:
	return count;
}

static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba)
{
	hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show;
	hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store;
	sysfs_attr_init(&hba->clk_scaling.enable_attr.attr);
	hba->clk_scaling.enable_attr.attr.name = "clkscale_enable";
	hba->clk_scaling.enable_attr.attr.mode = 0644;
	if (device_create_file(hba->dev, &hba->clk_scaling.enable_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n");
}

static void ufshcd_ungate_work(struct work_struct *work)
{
	int ret;
	unsigned long flags;
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.ungate_work);

	cancel_delayed_work_sync(&hba->clk_gating.gate_work);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == CLKS_ON) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		goto unblock_reqs;
	}

	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_setup_clocks(hba, true);

	/* Exit from hibern8 */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		/* Prevent gating in this path */
		hba->clk_gating.is_suspended = true;
		if (ufshcd_is_link_hibern8(hba)) {
			ret = ufshcd_uic_hibern8_exit(hba);
			if (ret)
				dev_err(hba->dev, "%s: hibern8 exit failed %d\n",
					__func__, ret);
			else
				ufshcd_set_link_active(hba);
		}
		hba->clk_gating.is_suspended = false;
	}
unblock_reqs:
	ufshcd_scsi_unblock_requests(hba);
}

/**
 * ufshcd_hold - Enable clocks that were gated earlier due to ufshcd_release.
 * Also, exit from hibern8 mode and set the link as active.
 * @hba: per adapter instance
 * @async: This indicates whether caller should ungate clocks asynchronously.
 */
int ufshcd_hold(struct ufs_hba *hba, bool async)
{
	int rc = 0;
	unsigned long flags;

	if (!ufshcd_is_clkgating_allowed(hba))
		goto out;
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.active_reqs++;

	if (ufshcd_eh_in_progress(hba)) {
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		return 0;
	}

start:
	switch (hba->clk_gating.state) {
	case CLKS_ON:
		/*
		 * Wait for the ungate work to complete if in progress.
		 * Though the clocks may be in ON state, the link could
		 * still be in hibner8 state if hibern8 is allowed
		 * during clock gating.
		 * Make sure we exit hibern8 state also in addition to
		 * clocks being ON.
		 */
		if (ufshcd_can_hibern8_during_gating(hba) &&
		    ufshcd_is_link_hibern8(hba)) {
			spin_unlock_irqrestore(hba->host->host_lock, flags);
			flush_work(&hba->clk_gating.ungate_work);
			spin_lock_irqsave(hba->host->host_lock, flags);
			goto start;
		}
		break;
	case REQ_CLKS_OFF:
		if (cancel_delayed_work(&hba->clk_gating.gate_work)) {
			hba->clk_gating.state = CLKS_ON;
			trace_ufshcd_clk_gating(dev_name(hba->dev),
						hba->clk_gating.state);
			break;
		}
		/*
		 * If we are here, it means gating work is either done or
		 * currently running. Hence, fall through to cancel gating
		 * work and to enable clocks.
		 */
		/* fallthrough */
	case CLKS_OFF:
		ufshcd_scsi_block_requests(hba);
		hba->clk_gating.state = REQ_CLKS_ON;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
		queue_work(hba->clk_gating.clk_gating_workq,
			   &hba->clk_gating.ungate_work);
		/*
		 * fall through to check if we should wait for this
		 * work to be done or not.
		 */
		/* fallthrough */
	case REQ_CLKS_ON:
		if (async) {
			rc = -EAGAIN;
			hba->clk_gating.active_reqs--;
			break;
		}

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		flush_work(&hba->clk_gating.ungate_work);
		/* Make sure state is CLKS_ON before returning */
		spin_lock_irqsave(hba->host->host_lock, flags);
		goto start;
	default:
		dev_err(hba->dev, "%s: clk gating is in invalid state %d\n",
				__func__, hba->clk_gating.state);
		break;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return rc;
}
EXPORT_SYMBOL_GPL(ufshcd_hold);

static void ufshcd_gate_work(struct work_struct *work)
{
	struct ufs_hba *hba = container_of(work, struct ufs_hba,
			clk_gating.gate_work.work);
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	/*
	 * In case you are here to cancel this work the gating state
	 * would be marked as REQ_CLKS_ON. In this case save time by
	 * skipping the gating work and exit after changing the clock
	 * state to CLKS_ON.
	 */
	if (hba->clk_gating.is_suspended ||
		(hba->clk_gating.state == REQ_CLKS_ON)) {
		hba->clk_gating.state = CLKS_ON;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
		goto rel_lock;
	}

	if (hba->clk_gating.active_reqs
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| hba->lrb_in_use || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done)
		goto rel_lock;

	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* put the link into hibern8 mode before turning off clocks */
	if (ufshcd_can_hibern8_during_gating(hba)) {
		if (ufshcd_uic_hibern8_enter(hba)) {
			hba->clk_gating.state = CLKS_ON;
			trace_ufshcd_clk_gating(dev_name(hba->dev),
						hba->clk_gating.state);
			goto out;
		}
		ufshcd_set_link_hibern8(hba);
	}

	if (!ufshcd_is_link_active(hba))
		ufshcd_setup_clocks(hba, false);
	else
		/* If link is active, device ref_clk can't be switched off */
		__ufshcd_setup_clocks(hba, false, true);

	/*
	 * In case you are here to cancel this work the gating state
	 * would be marked as REQ_CLKS_ON. In this case keep the state
	 * as REQ_CLKS_ON which would anyway imply that clocks are off
	 * and a request to turn them on is pending. By doing this way,
	 * we keep the state machine in tact and this would ultimately
	 * prevent from doing cancel work multiple times when there are
	 * new requests arriving before the current cancel work is done.
	 */
	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->clk_gating.state == REQ_CLKS_OFF) {
		hba->clk_gating.state = CLKS_OFF;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
	}
rel_lock:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	return;
}

/* host lock must be held before calling this variant */
static void __ufshcd_release(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.active_reqs--;

	if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended
		|| hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL
		|| hba->lrb_in_use || hba->outstanding_tasks
		|| hba->active_uic_cmd || hba->uic_async_done
		|| ufshcd_eh_in_progress(hba))
		return;

	hba->clk_gating.state = REQ_CLKS_OFF;
	trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
	queue_delayed_work(hba->clk_gating.clk_gating_workq,
			   &hba->clk_gating.gate_work,
			   msecs_to_jiffies(hba->clk_gating.delay_ms));
}

void ufshcd_release(struct ufs_hba *hba)
{
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	__ufshcd_release(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}
EXPORT_SYMBOL_GPL(ufshcd_release);

static ssize_t ufshcd_clkgate_delay_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%lu\n", hba->clk_gating.delay_ms);
}

static ssize_t ufshcd_clkgate_delay_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	unsigned long flags, value;

	if (kstrtoul(buf, 0, &value))
		return -EINVAL;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->clk_gating.delay_ms = value;
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return count;
}

static ssize_t ufshcd_clkgate_enable_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n", hba->clk_gating.is_enabled);
}

static ssize_t ufshcd_clkgate_enable_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct ufs_hba *hba = dev_get_drvdata(dev);
	unsigned long flags;
	u32 value;

	if (kstrtou32(buf, 0, &value))
		return -EINVAL;

	value = !!value;
	if (value == hba->clk_gating.is_enabled)
		goto out;

	if (value) {
		ufshcd_release(hba);
	} else {
		spin_lock_irqsave(hba->host->host_lock, flags);
		hba->clk_gating.active_reqs++;
		spin_unlock_irqrestore(hba->host->host_lock, flags);
	}

	hba->clk_gating.is_enabled = value;
out:
	return count;
}

static void ufshcd_init_clk_scaling(struct ufs_hba *hba)
{
	char wq_name[sizeof("ufs_clkscaling_00")];

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	INIT_WORK(&hba->clk_scaling.suspend_work,
		  ufshcd_clk_scaling_suspend_work);
	INIT_WORK(&hba->clk_scaling.resume_work,
		  ufshcd_clk_scaling_resume_work);

	snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d",
		 hba->host->host_no);
	hba->clk_scaling.workq = create_singlethread_workqueue(wq_name);

	ufshcd_clkscaling_init_sysfs(hba);
}

static void ufshcd_exit_clk_scaling(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	destroy_workqueue(hba->clk_scaling.workq);
	ufshcd_devfreq_remove(hba);
}

static void ufshcd_init_clk_gating(struct ufs_hba *hba)
{
	char wq_name[sizeof("ufs_clk_gating_00")];

	if (!ufshcd_is_clkgating_allowed(hba))
		return;

	hba->clk_gating.delay_ms = 150;
	INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work);
	INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work);

	snprintf(wq_name, ARRAY_SIZE(wq_name), "ufs_clk_gating_%d",
		 hba->host->host_no);
	hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name,
							   WQ_MEM_RECLAIM);

	hba->clk_gating.is_enabled = true;

	hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show;
	hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store;
	sysfs_attr_init(&hba->clk_gating.delay_attr.attr);
	hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms";
	hba->clk_gating.delay_attr.attr.mode = 0644;
	if (device_create_file(hba->dev, &hba->clk_gating.delay_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n");

	hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show;
	hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store;
	sysfs_attr_init(&hba->clk_gating.enable_attr.attr);
	hba->clk_gating.enable_attr.attr.name = "clkgate_enable";
	hba->clk_gating.enable_attr.attr.mode = 0644;
	if (device_create_file(hba->dev, &hba->clk_gating.enable_attr))
		dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n");
}

static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
	if (!ufshcd_is_clkgating_allowed(hba))
		return;
	device_remove_file(hba->dev, &hba->clk_gating.delay_attr);
	device_remove_file(hba->dev, &hba->clk_gating.enable_attr);
	cancel_work_sync(&hba->clk_gating.ungate_work);
	cancel_delayed_work_sync(&hba->clk_gating.gate_work);
	destroy_workqueue(hba->clk_gating.clk_gating_workq);
}

/* Must be called with host lock acquired */
static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba)
{
	bool queue_resume_work = false;

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	if (!hba->clk_scaling.active_reqs++)
		queue_resume_work = true;

	if (!hba->clk_scaling.is_allowed || hba->pm_op_in_progress)
		return;

	if (queue_resume_work)
		queue_work(hba->clk_scaling.workq,
			   &hba->clk_scaling.resume_work);

	if (!hba->clk_scaling.window_start_t) {
		hba->clk_scaling.window_start_t = jiffies;
		hba->clk_scaling.tot_busy_t = 0;
		hba->clk_scaling.is_busy_started = false;
	}

	if (!hba->clk_scaling.is_busy_started) {
		hba->clk_scaling.busy_start_t = ktime_get();
		hba->clk_scaling.is_busy_started = true;
	}
}

static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba)
{
	struct ufs_clk_scaling *scaling = &hba->clk_scaling;

	if (!ufshcd_is_clkscaling_supported(hba))
		return;

	if (!hba->outstanding_reqs && scaling->is_busy_started) {
		scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(),
					scaling->busy_start_t));
		scaling->busy_start_t = 0;
		scaling->is_busy_started = false;
	}
}
/**
 * ufshcd_send_command - Send SCSI or device management commands
 * @hba: per adapter instance
 * @task_tag: Task tag of the command
 */
static inline
void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
{
	hba->lrb[task_tag].issue_time_stamp = ktime_get();
	hba->lrb[task_tag].compl_time_stamp = ktime_set(0, 0);
	ufshcd_clk_scaling_start_busy(hba);
	__set_bit(task_tag, &hba->outstanding_reqs);
	ufshcd_writel(hba, 1 << task_tag, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	/* Make sure that doorbell is committed immediately */
	wmb();
	ufshcd_add_command_trace(hba, task_tag, "send");
}

/**
 * ufshcd_copy_sense_data - Copy sense data in case of check condition
 * @lrbp: pointer to local reference block
 */
static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
{
	int len;
	if (lrbp->sense_buffer &&
	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
		int len_to_copy;

		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
		len_to_copy = min_t(int, UFS_SENSE_SIZE, len);

		memcpy(lrbp->sense_buffer, lrbp->ucd_rsp_ptr->sr.sense_data,
		       len_to_copy);
	}
}

/**
 * ufshcd_copy_query_response() - Copy the Query Response and the data
 * descriptor
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static
int ufshcd_copy_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	memcpy(&query_res->upiu_res, &lrbp->ucd_rsp_ptr->qr, QUERY_OSF_SIZE);

	/* Get the descriptor */
	if (hba->dev_cmd.query.descriptor &&
	    lrbp->ucd_rsp_ptr->qr.opcode == UPIU_QUERY_OPCODE_READ_DESC) {
		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr +
				GENERAL_UPIU_REQUEST_SIZE;
		u16 resp_len;
		u16 buf_len;

		/* data segment length */
		resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
						MASK_QUERY_DATA_SEG_LEN;
		buf_len = be16_to_cpu(
				hba->dev_cmd.query.request.upiu_req.length);
		if (likely(buf_len >= resp_len)) {
			memcpy(hba->dev_cmd.query.descriptor, descp, resp_len);
		} else {
			dev_warn(hba->dev,
				"%s: Response size is bigger than buffer",
				__func__);
			return -EINVAL;
		}
	}

	return 0;
}

/**
 * ufshcd_hba_capabilities - Read controller capabilities
 * @hba: per adapter instance
 */
static inline void ufshcd_hba_capabilities(struct ufs_hba *hba)
{
	hba->capabilities = ufshcd_readl(hba, REG_CONTROLLER_CAPABILITIES);

	/* nutrs and nutmrs are 0 based values */
	hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
	hba->nutmrs =
	((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
}

/**
 * ufshcd_ready_for_uic_cmd - Check if controller is ready
 *                            to accept UIC commands
 * @hba: per adapter instance
 * Return true on success, else false
 */
static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
{
	if (ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY)
		return true;
	else
		return false;
}

/**
 * ufshcd_get_upmcrs - Get the power mode change request status
 * @hba: Pointer to adapter instance
 *
 * This function gets the UPMCRS field of HCS register
 * Returns value of UPMCRS field
 */
static inline u8 ufshcd_get_upmcrs(struct ufs_hba *hba)
{
	return (ufshcd_readl(hba, REG_CONTROLLER_STATUS) >> 8) & 0x7;
}

/**
 * ufshcd_dispatch_uic_cmd - Dispatch UIC commands to unipro layers
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Mutex must be held.
 */
static inline void
ufshcd_dispatch_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	WARN_ON(hba->active_uic_cmd);

	hba->active_uic_cmd = uic_cmd;

	/* Write Args */
	ufshcd_writel(hba, uic_cmd->argument1, REG_UIC_COMMAND_ARG_1);
	ufshcd_writel(hba, uic_cmd->argument2, REG_UIC_COMMAND_ARG_2);
	ufshcd_writel(hba, uic_cmd->argument3, REG_UIC_COMMAND_ARG_3);

	/* Write UIC Cmd */
	ufshcd_writel(hba, uic_cmd->command & COMMAND_OPCODE_MASK,
		      REG_UIC_COMMAND);
}

/**
 * ufshcd_wait_for_uic_cmd - Wait complectioin of UIC command
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Must be called with mutex held.
 * Returns 0 only if success.
 */
static int
ufshcd_wait_for_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
	unsigned long flags;

	if (wait_for_completion_timeout(&uic_cmd->done,
					msecs_to_jiffies(UIC_CMD_TIMEOUT)))
		ret = uic_cmd->argument2 & MASK_UIC_COMMAND_RESULT;
	else
		ret = -ETIMEDOUT;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->active_uic_cmd = NULL;
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return ret;
}

/**
 * __ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 * @completion: initialize the completion only if this is set to true
 *
 * Identical to ufshcd_send_uic_cmd() expect mutex. Must be called
 * with mutex held and host_lock locked.
 * Returns 0 only if success.
 */
static int
__ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd,
		      bool completion)
{
	if (!ufshcd_ready_for_uic_cmd(hba)) {
		dev_err(hba->dev,
			"Controller not ready to accept UIC commands\n");
		return -EIO;
	}

	if (completion)
		init_completion(&uic_cmd->done);

	ufshcd_dispatch_uic_cmd(hba, uic_cmd);

	return 0;
}

/**
 * ufshcd_send_uic_cmd - Send UIC commands and retrieve the result
 * @hba: per adapter instance
 * @uic_cmd: UIC command
 *
 * Returns 0 only if success.
 */
int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
{
	int ret;
	unsigned long flags;

	ufshcd_hold(hba, false);
	mutex_lock(&hba->uic_cmd_mutex);
	ufshcd_add_delay_before_dme_cmd(hba);

	spin_lock_irqsave(hba->host->host_lock, flags);
	ret = __ufshcd_send_uic_cmd(hba, uic_cmd, true);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	if (!ret)
		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);

	mutex_unlock(&hba->uic_cmd_mutex);

	ufshcd_release(hba);
	return ret;
}

/**
 * ufshcd_map_sg - Map scatter-gather list to prdt
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 *
 * Returns 0 in case of success, non-zero value in case of failure
 */
static int ufshcd_map_sg(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufshcd_sg_entry *prd_table;
	struct scatterlist *sg;
	struct scsi_cmnd *cmd;
	int sg_segments;
	int i;

	cmd = lrbp->cmd;
	sg_segments = scsi_dma_map(cmd);
	if (sg_segments < 0)
		return sg_segments;

	if (sg_segments) {
		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
			lrbp->utr_descriptor_ptr->prd_table_length =
				cpu_to_le16((u16)(sg_segments *
					sizeof(struct ufshcd_sg_entry)));
		else
			lrbp->utr_descriptor_ptr->prd_table_length =
				cpu_to_le16((u16) (sg_segments));

		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;

		scsi_for_each_sg(cmd, sg, sg_segments, i) {
			prd_table[i].size  =
				cpu_to_le32(((u32) sg_dma_len(sg))-1);
			prd_table[i].base_addr =
				cpu_to_le32(lower_32_bits(sg->dma_address));
			prd_table[i].upper_addr =
				cpu_to_le32(upper_32_bits(sg->dma_address));
			prd_table[i].reserved = 0;
		}
	} else {
		lrbp->utr_descriptor_ptr->prd_table_length = 0;
	}

	return 0;
}

/**
 * ufshcd_enable_intr - enable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_enable_intr(struct ufs_hba *hba, u32 intrs)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == UFSHCI_VERSION_10) {
		u32 rw;
		rw = set & INTERRUPT_MASK_RW_VER_10;
		set = rw | ((set ^ intrs) & intrs);
	} else {
		set |= intrs;
	}

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_disable_intr - disable interrupts
 * @hba: per adapter instance
 * @intrs: interrupt bits
 */
static void ufshcd_disable_intr(struct ufs_hba *hba, u32 intrs)
{
	u32 set = ufshcd_readl(hba, REG_INTERRUPT_ENABLE);

	if (hba->ufs_version == UFSHCI_VERSION_10) {
		u32 rw;
		rw = (set & INTERRUPT_MASK_RW_VER_10) &
			~(intrs & INTERRUPT_MASK_RW_VER_10);
		set = rw | ((set & intrs) & ~INTERRUPT_MASK_RW_VER_10);

	} else {
		set &= ~intrs;
	}

	ufshcd_writel(hba, set, REG_INTERRUPT_ENABLE);
}

/**
 * ufshcd_prepare_req_desc_hdr() - Fills the requests header
 * descriptor according to request
 * @lrbp: pointer to local reference block
 * @upiu_flags: flags required in the header
 * @cmd_dir: requests data direction
 */
static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
			u32 *upiu_flags, enum dma_data_direction cmd_dir)
{
	struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
	u32 data_direction;
	u32 dword_0;

	if (cmd_dir == DMA_FROM_DEVICE) {
		data_direction = UTP_DEVICE_TO_HOST;
		*upiu_flags = UPIU_CMD_FLAGS_READ;
	} else if (cmd_dir == DMA_TO_DEVICE) {
		data_direction = UTP_HOST_TO_DEVICE;
		*upiu_flags = UPIU_CMD_FLAGS_WRITE;
	} else {
		data_direction = UTP_NO_DATA_TRANSFER;
		*upiu_flags = UPIU_CMD_FLAGS_NONE;
	}

	dword_0 = data_direction | (lrbp->command_type
				<< UPIU_COMMAND_TYPE_OFFSET);
	if (lrbp->intr_cmd)
		dword_0 |= UTP_REQ_DESC_INT_CMD;

	/* Transfer request descriptor header fields */
	req_desc->header.dword_0 = cpu_to_le32(dword_0);
	/* dword_1 is reserved, hence it is set to 0 */
	req_desc->header.dword_1 = 0;
	/*
	 * assigning invalid value for command status. Controller
	 * updates OCS on command completion, with the command
	 * status
	 */
	req_desc->header.dword_2 =
		cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
	/* dword_3 is reserved, hence it is set to 0 */
	req_desc->header.dword_3 = 0;

	req_desc->prd_table_length = 0;
}

/**
 * ufshcd_prepare_utp_scsi_cmd_upiu() - fills the utp_transfer_req_desc,
 * for scsi commands
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static
void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
	unsigned short cdb_len;

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
				UPIU_TRANSACTION_COMMAND, upiu_flags,
				lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
				UPIU_COMMAND_SET_TYPE_SCSI, 0, 0, 0);

	/* Total EHS length and Data segment length will be zero */
	ucd_req_ptr->header.dword_2 = 0;

	ucd_req_ptr->sc.exp_data_transfer_len =
		cpu_to_be32(lrbp->cmd->sdb.length);

	cdb_len = min_t(unsigned short, lrbp->cmd->cmd_len, UFS_CDB_SIZE);
	memset(ucd_req_ptr->sc.cdb, 0, UFS_CDB_SIZE);
	memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd, cdb_len);

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

/**
 * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
 * for query requsts
 * @hba: UFS hba
 * @lrbp: local reference block pointer
 * @upiu_flags: flags
 */
static void ufshcd_prepare_utp_query_req_upiu(struct ufs_hba *hba,
				struct ufshcd_lrb *lrbp, u32 upiu_flags)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
	struct ufs_query *query = &hba->dev_cmd.query;
	u16 len = be16_to_cpu(query->request.upiu_req.length);

	/* Query request header */
	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_QUERY_REQ, upiu_flags,
			lrbp->lun, lrbp->task_tag);
	ucd_req_ptr->header.dword_1 = UPIU_HEADER_DWORD(
			0, query->request.query_func, 0, 0);

	/* Data segment length only need for WRITE_DESC */
	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
		ucd_req_ptr->header.dword_2 =
			UPIU_HEADER_DWORD(0, 0, (len >> 8), (u8)len);
	else
		ucd_req_ptr->header.dword_2 = 0;

	/* Copy the Query Request buffer as is */
	memcpy(&ucd_req_ptr->qr, &query->request.upiu_req,
			QUERY_OSF_SIZE);

	/* Copy the Descriptor */
	if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC)
		memcpy(ucd_req_ptr + 1, query->descriptor, len);

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp)
{
	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;

	memset(ucd_req_ptr, 0, sizeof(struct utp_upiu_req));

	/* command descriptor fields */
	ucd_req_ptr->header.dword_0 =
		UPIU_HEADER_DWORD(
			UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag);
	/* clear rest of the fields of basic header */
	ucd_req_ptr->header.dword_1 = 0;
	ucd_req_ptr->header.dword_2 = 0;

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
}

/**
 * ufshcd_comp_devman_upiu - UFS Protocol Information Unit(UPIU)
 *			     for Device Management Purposes
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int ufshcd_comp_devman_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	u32 upiu_flags;
	int ret = 0;

	if ((hba->ufs_version == UFSHCI_VERSION_10) ||
	    (hba->ufs_version == UFSHCI_VERSION_11))
		lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
	else
		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

	ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
	if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
		ufshcd_prepare_utp_query_req_upiu(hba, lrbp, upiu_flags);
	else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP)
		ufshcd_prepare_utp_nop_upiu(lrbp);
	else
		ret = -EINVAL;

	return ret;
}

/**
 * ufshcd_comp_scsi_upiu - UFS Protocol Information Unit(UPIU)
 *			   for SCSI Purposes
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	u32 upiu_flags;
	int ret = 0;

	if ((hba->ufs_version == UFSHCI_VERSION_10) ||
	    (hba->ufs_version == UFSHCI_VERSION_11))
		lrbp->command_type = UTP_CMD_TYPE_SCSI;
	else
		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;

	if (likely(lrbp->cmd)) {
		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
						lrbp->cmd->sc_data_direction);
		ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
	} else {
		ret = -EINVAL;
	}

	return ret;
}

/**
 * ufshcd_upiu_wlun_to_scsi_wlun - maps UPIU W-LUN id to SCSI W-LUN ID
 * @upiu_wlun_id: UPIU W-LUN id
 *
 * Returns SCSI W-LUN id
 */
static inline u16 ufshcd_upiu_wlun_to_scsi_wlun(u8 upiu_wlun_id)
{
	return (upiu_wlun_id & ~UFS_UPIU_WLUN_ID) | SCSI_W_LUN_BASE;
}

/**
 * ufshcd_queuecommand - main entry point for SCSI requests
 * @host: SCSI host pointer
 * @cmd: command from SCSI Midlayer
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
{
	struct ufshcd_lrb *lrbp;
	struct ufs_hba *hba;
	unsigned long flags;
	int tag;
	int err = 0;

	hba = shost_priv(host);

	tag = cmd->request->tag;
	if (!ufshcd_valid_tag(hba, tag)) {
		dev_err(hba->dev,
			"%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p",
			__func__, tag, cmd, cmd->request);
		BUG();
	}

	if (!down_read_trylock(&hba->clk_scaling_lock))
		return SCSI_MLQUEUE_HOST_BUSY;

	spin_lock_irqsave(hba->host->host_lock, flags);
	switch (hba->ufshcd_state) {
	case UFSHCD_STATE_OPERATIONAL:
		break;
	case UFSHCD_STATE_EH_SCHEDULED:
	case UFSHCD_STATE_RESET:
		err = SCSI_MLQUEUE_HOST_BUSY;
		goto out_unlock;
	case UFSHCD_STATE_ERROR:
		set_host_byte(cmd, DID_ERROR);
		cmd->scsi_done(cmd);
		goto out_unlock;
	default:
		dev_WARN_ONCE(hba->dev, 1, "%s: invalid state %d\n",
				__func__, hba->ufshcd_state);
		set_host_byte(cmd, DID_BAD_TARGET);
		cmd->scsi_done(cmd);
		goto out_unlock;
	}

	/* if error handling is in progress, don't issue commands */
	if (ufshcd_eh_in_progress(hba)) {
		set_host_byte(cmd, DID_ERROR);
		cmd->scsi_done(cmd);
		goto out_unlock;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	hba->req_abort_count = 0;

	/* acquire the tag to make sure device cmds don't use it */
	if (test_and_set_bit_lock(tag, &hba->lrb_in_use)) {
		/*
		 * Dev manage command in progress, requeue the command.
		 * Requeuing the command helps in cases where the request *may*
		 * find different tag instead of waiting for dev manage command
		 * completion.
		 */
		err = SCSI_MLQUEUE_HOST_BUSY;
		goto out;
	}

	err = ufshcd_hold(hba, true);
	if (err) {
		err = SCSI_MLQUEUE_HOST_BUSY;
		clear_bit_unlock(tag, &hba->lrb_in_use);
		goto out;
	}
	WARN_ON(hba->clk_gating.state != CLKS_ON);

	lrbp = &hba->lrb[tag];

	WARN_ON(lrbp->cmd);
	lrbp->cmd = cmd;
	lrbp->sense_bufflen = UFS_SENSE_SIZE;
	lrbp->sense_buffer = cmd->sense_buffer;
	lrbp->task_tag = tag;
	lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
	lrbp->intr_cmd = !ufshcd_is_intr_aggr_allowed(hba) ? true : false;
	lrbp->req_abort_skip = false;

	ufshcd_comp_scsi_upiu(hba, lrbp);

	err = ufshcd_map_sg(hba, lrbp);
	if (err) {
		lrbp->cmd = NULL;
		clear_bit_unlock(tag, &hba->lrb_in_use);
		goto out;
	}
	/* Make sure descriptors are ready before ringing the doorbell */
	wmb();

	/* issue command to the controller */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_vops_setup_xfer_req(hba, tag, (lrbp->cmd ? true : false));
	ufshcd_send_command(hba, tag);
out_unlock:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
out:
	up_read(&hba->clk_scaling_lock);
	return err;
}

static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
{
	lrbp->cmd = NULL;
	lrbp->sense_bufflen = 0;
	lrbp->sense_buffer = NULL;
	lrbp->task_tag = tag;
	lrbp->lun = 0; /* device management cmd is not specific to any LUN */
	lrbp->intr_cmd = true; /* No interrupt aggregation */
	hba->dev_cmd.type = cmd_type;

	return ufshcd_comp_devman_upiu(hba, lrbp);
}

static int
ufshcd_clear_cmd(struct ufs_hba *hba, int tag)
{
	int err = 0;
	unsigned long flags;
	u32 mask = 1 << tag;

	/* clear outstanding transaction before retry */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_utrl_clear(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/*
	 * wait for for h/w to clear corresponding bit in door-bell.
	 * max. wait is 1 sec.
	 */
	err = ufshcd_wait_for_register(hba,
			REG_UTP_TRANSFER_REQ_DOOR_BELL,
			mask, ~mask, 1000, 1000, true);

	return err;
}

static int
ufshcd_check_query_response(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	struct ufs_query_res *query_res = &hba->dev_cmd.query.response;

	/* Get the UPIU response */
	query_res->response = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr) >>
				UPIU_RSP_CODE_OFFSET;
	return query_res->response;
}

/**
 * ufshcd_dev_cmd_completion() - handles device management command responses
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block
 */
static int
ufshcd_dev_cmd_completion(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int resp;
	int err = 0;

	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
	resp = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);

	switch (resp) {
	case UPIU_TRANSACTION_NOP_IN:
		if (hba->dev_cmd.type != DEV_CMD_TYPE_NOP) {
			err = -EINVAL;
			dev_err(hba->dev, "%s: unexpected response %x\n",
					__func__, resp);
		}
		break;
	case UPIU_TRANSACTION_QUERY_RSP:
		err = ufshcd_check_query_response(hba, lrbp);
		if (!err)
			err = ufshcd_copy_query_response(hba, lrbp);
		break;
	case UPIU_TRANSACTION_REJECT_UPIU:
		/* TODO: handle Reject UPIU Response */
		err = -EPERM;
		dev_err(hba->dev, "%s: Reject UPIU not fully implemented\n",
				__func__);
		break;
	default:
		err = -EINVAL;
		dev_err(hba->dev, "%s: Invalid device management cmd response: %x\n",
				__func__, resp);
		break;
	}

	return err;
}

static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
		struct ufshcd_lrb *lrbp, int max_timeout)
{
	int err = 0;
	unsigned long time_left;
	unsigned long flags;

	time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
			msecs_to_jiffies(max_timeout));

	/* Make sure descriptors are ready before ringing the doorbell */
	wmb();
	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->dev_cmd.complete = NULL;
	if (likely(time_left)) {
		err = ufshcd_get_tr_ocs(lrbp);
		if (!err)
			err = ufshcd_dev_cmd_completion(hba, lrbp);
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (!time_left) {
		err = -ETIMEDOUT;
		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
			__func__, lrbp->task_tag);
		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
			/* successfully cleared the command, retry if needed */
			err = -EAGAIN;
		/*
		 * in case of an error, after clearing the doorbell,
		 * we also need to clear the outstanding_request
		 * field in hba
		 */
		ufshcd_outstanding_req_clear(hba, lrbp->task_tag);
	}

	return err;
}

/**
 * ufshcd_get_dev_cmd_tag - Get device management command tag
 * @hba: per-adapter instance
 * @tag_out: pointer to variable with available slot value
 *
 * Get a free slot and lock it until device management command
 * completes.
 *
 * Returns false if free slot is unavailable for locking, else
 * return true with tag value in @tag.
 */
static bool ufshcd_get_dev_cmd_tag(struct ufs_hba *hba, int *tag_out)
{
	int tag;
	bool ret = false;
	unsigned long tmp;

	if (!tag_out)
		goto out;

	do {
		tmp = ~hba->lrb_in_use;
		tag = find_last_bit(&tmp, hba->nutrs);
		if (tag >= hba->nutrs)
			goto out;
	} while (test_and_set_bit_lock(tag, &hba->lrb_in_use));

	*tag_out = tag;
	ret = true;
out:
	return ret;
}

static inline void ufshcd_put_dev_cmd_tag(struct ufs_hba *hba, int tag)
{
	clear_bit_unlock(tag, &hba->lrb_in_use);
}

/**
 * ufshcd_exec_dev_cmd - API for sending device management requests
 * @hba: UFS hba
 * @cmd_type: specifies the type (NOP, Query...)
 * @timeout: time in seconds
 *
 * NOTE: Since there is only one available tag for device management commands,
 * it is expected you hold the hba->dev_cmd.lock mutex.
 */
static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
		enum dev_cmd_type cmd_type, int timeout)
{
	struct ufshcd_lrb *lrbp;
	int err;
	int tag;
	struct completion wait;
	unsigned long flags;

	down_read(&hba->clk_scaling_lock);

	/*
	 * Get free slot, sleep if slots are unavailable.
	 * Even though we use wait_event() which sleeps indefinitely,
	 * the maximum wait time is bounded by SCSI request timeout.
	 */
	wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));

	init_completion(&wait);
	lrbp = &hba->lrb[tag];
	WARN_ON(lrbp->cmd);
	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
	if (unlikely(err))
		goto out_put_tag;

	hba->dev_cmd.complete = &wait;

	ufshcd_add_query_upiu_trace(hba, tag, "query_send");
	/* Make sure descriptors are ready before ringing the doorbell */
	wmb();
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_vops_setup_xfer_req(hba, tag, (lrbp->cmd ? true : false));
	ufshcd_send_command(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);

	ufshcd_add_query_upiu_trace(hba, tag,
			err ? "query_complete_err" : "query_complete");

out_put_tag:
	ufshcd_put_dev_cmd_tag(hba, tag);
	wake_up(&hba->dev_cmd.tag_wq);
	up_read(&hba->clk_scaling_lock);
	return err;
}

/**
 * ufshcd_init_query() - init the query response and request parameters
 * @hba: per-adapter instance
 * @request: address of the request pointer to be initialized
 * @response: address of the response pointer to be initialized
 * @opcode: operation to perform
 * @idn: flag idn to access
 * @index: LU number to access
 * @selector: query/flag/descriptor further identification
 */
static inline void ufshcd_init_query(struct ufs_hba *hba,
		struct ufs_query_req **request, struct ufs_query_res **response,
		enum query_opcode opcode, u8 idn, u8 index, u8 selector)
{
	*request = &hba->dev_cmd.query.request;
	*response = &hba->dev_cmd.query.response;
	memset(*request, 0, sizeof(struct ufs_query_req));
	memset(*response, 0, sizeof(struct ufs_query_res));
	(*request)->upiu_req.opcode = opcode;
	(*request)->upiu_req.idn = idn;
	(*request)->upiu_req.index = index;
	(*request)->upiu_req.selector = selector;
}

static int ufshcd_query_flag_retry(struct ufs_hba *hba,
	enum query_opcode opcode, enum flag_idn idn, bool *flag_res)
{
	int ret;
	int retries;

	for (retries = 0; retries < QUERY_REQ_RETRIES; retries++) {
		ret = ufshcd_query_flag(hba, opcode, idn, flag_res);
		if (ret)
			dev_dbg(hba->dev,
				"%s: failed with error %d, retries %d\n",
				__func__, ret, retries);
		else
			break;
	}

	if (ret)
		dev_err(hba->dev,
			"%s: query attribute, opcode %d, idn %d, failed with error %d after %d retires\n",
			__func__, opcode, idn, ret, retries);
	return ret;
}

/**
 * ufshcd_query_flag() - API function for sending flag query requests
 * @hba: per-adapter instance
 * @opcode: flag query to perform
 * @idn: flag idn to access
 * @flag_res: the flag value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
 */
int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
			enum flag_idn idn, bool *flag_res)
{
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err, index = 0, selector = 0;
	int timeout = QUERY_REQ_TIMEOUT;

	BUG_ON(!hba);

	ufshcd_hold(hba, false);
	mutex_lock(&hba->dev_cmd.lock);
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);

	switch (opcode) {
	case UPIU_QUERY_OPCODE_SET_FLAG:
	case UPIU_QUERY_OPCODE_CLEAR_FLAG:
	case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_FLAG:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		if (!flag_res) {
			/* No dummy reads */
			dev_err(hba->dev, "%s: Invalid argument for read request\n",
					__func__);
			err = -EINVAL;
			goto out_unlock;
		}
		break;
	default:
		dev_err(hba->dev,
			"%s: Expected query flag opcode but got = %d\n",
			__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, timeout);

	if (err) {
		dev_err(hba->dev,
			"%s: Sending flag query for idn %d failed, err = %d\n",
			__func__, idn, err);
		goto out_unlock;
	}

	if (flag_res)
		*flag_res = (be32_to_cpu(response->upiu_res.value) &
				MASK_QUERY_UPIU_FLAG_LOC) & 0x1;

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
	ufshcd_release(hba);
	return err;
}

/**
 * ufshcd_query_attr - API function for sending attribute requests
 * @hba: per-adapter instance
 * @opcode: attribute opcode
 * @idn: attribute idn to access
 * @index: index field
 * @selector: selector field
 * @attr_val: the attribute value after the query request completes
 *
 * Returns 0 for success, non-zero in case of failure
*/
int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
		      enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
{
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err;

	BUG_ON(!hba);

	ufshcd_hold(hba, false);
	if (!attr_val) {
		dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out;
	}

	mutex_lock(&hba->dev_cmd.lock);
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);

	switch (opcode) {
	case UPIU_QUERY_OPCODE_WRITE_ATTR:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		request->upiu_req.value = cpu_to_be32(*attr_val);
		break;
	case UPIU_QUERY_OPCODE_READ_ATTR:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		break;
	default:
		dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);

	if (err) {
		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
				__func__, opcode, idn, index, err);
		goto out_unlock;
	}

	*attr_val = be32_to_cpu(response->upiu_res.value);

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
out:
	ufshcd_release(hba);
	return err;
}

/**
 * ufshcd_query_attr_retry() - API function for sending query
 * attribute with retries
 * @hba: per-adapter instance
 * @opcode: attribute opcode
 * @idn: attribute idn to access
 * @index: index field
 * @selector: selector field
 * @attr_val: the attribute value after the query request
 * completes
 *
 * Returns 0 for success, non-zero in case of failure
*/
static int ufshcd_query_attr_retry(struct ufs_hba *hba,
	enum query_opcode opcode, enum attr_idn idn, u8 index, u8 selector,
	u32 *attr_val)
{
	int ret = 0;
	u32 retries;

	 for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
		ret = ufshcd_query_attr(hba, opcode, idn, index,
						selector, attr_val);
		if (ret)
			dev_dbg(hba->dev, "%s: failed with error %d, retries %d\n",
				__func__, ret, retries);
		else
			break;
	}

	if (ret)
		dev_err(hba->dev,
			"%s: query attribute, idn %d, failed with error %d after %d retires\n",
			__func__, idn, ret, QUERY_REQ_RETRIES);
	return ret;
}

static int __ufshcd_query_descriptor(struct ufs_hba *hba,
			enum query_opcode opcode, enum desc_idn idn, u8 index,
			u8 selector, u8 *desc_buf, int *buf_len)
{
	struct ufs_query_req *request = NULL;
	struct ufs_query_res *response = NULL;
	int err;

	BUG_ON(!hba);

	ufshcd_hold(hba, false);
	if (!desc_buf) {
		dev_err(hba->dev, "%s: descriptor buffer required for opcode 0x%x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out;
	}

	if (*buf_len < QUERY_DESC_MIN_SIZE || *buf_len > QUERY_DESC_MAX_SIZE) {
		dev_err(hba->dev, "%s: descriptor buffer size (%d) is out of range\n",
				__func__, *buf_len);
		err = -EINVAL;
		goto out;
	}

	mutex_lock(&hba->dev_cmd.lock);
	ufshcd_init_query(hba, &request, &response, opcode, idn, index,
			selector);
	hba->dev_cmd.query.descriptor = desc_buf;
	request->upiu_req.length = cpu_to_be16(*buf_len);

	switch (opcode) {
	case UPIU_QUERY_OPCODE_WRITE_DESC:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
		break;
	case UPIU_QUERY_OPCODE_READ_DESC:
		request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
		break;
	default:
		dev_err(hba->dev,
				"%s: Expected query descriptor opcode but got = 0x%.2x\n",
				__func__, opcode);
		err = -EINVAL;
		goto out_unlock;
	}

	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);

	if (err) {
		dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
				__func__, opcode, idn, index, err);
		goto out_unlock;
	}

	hba->dev_cmd.query.descriptor = NULL;
	*buf_len = be16_to_cpu(response->upiu_res.length);

out_unlock:
	mutex_unlock(&hba->dev_cmd.lock);
out:
	ufshcd_release(hba);
	return err;
}

/**
 * ufshcd_query_descriptor_retry - API function for sending descriptor requests
 * @hba: per-adapter instance
 * @opcode: attribute opcode
 * @idn: attribute idn to access
 * @index: index field
 * @selector: selector field
 * @desc_buf: the buffer that contains the descriptor
 * @buf_len: length parameter passed to the device
 *
 * Returns 0 for success, non-zero in case of failure.
 * The buf_len parameter will contain, on return, the length parameter
 * received on the response.
 */
int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
				  enum query_opcode opcode,
				  enum desc_idn idn, u8 index,
				  u8 selector,
				  u8 *desc_buf, int *buf_len)
{
	int err;
	int retries;

	for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
		err = __ufshcd_query_descriptor(hba, opcode, idn, index,
						selector, desc_buf, buf_len);
		if (!err || err == -EINVAL)
			break;
	}

	return err;
}

/**
 * ufshcd_read_desc_length - read the specified descriptor length from header
 * @hba: Pointer to adapter instance
 * @desc_id: descriptor idn value
 * @desc_index: descriptor index
 * @desc_length: pointer to variable to read the length of descriptor
 *
 * Return 0 in case of success, non-zero otherwise
 */
static int ufshcd_read_desc_length(struct ufs_hba *hba,
	enum desc_idn desc_id,
	int desc_index,
	int *desc_length)
{
	int ret;
	u8 header[QUERY_DESC_HDR_SIZE];
	int header_len = QUERY_DESC_HDR_SIZE;

	if (desc_id >= QUERY_DESC_IDN_MAX)
		return -EINVAL;

	ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
					desc_id, desc_index, 0, header,
					&header_len);

	if (ret) {
		dev_err(hba->dev, "%s: Failed to get descriptor header id %d",
			__func__, desc_id);
		return ret;
	} else if (desc_id != header[QUERY_DESC_DESC_TYPE_OFFSET]) {
		dev_warn(hba->dev, "%s: descriptor header id %d and desc_id %d mismatch",
			__func__, header[QUERY_DESC_DESC_TYPE_OFFSET],
			desc_id);
		ret = -EINVAL;
	}

	*desc_length = header[QUERY_DESC_LENGTH_OFFSET];
	return ret;

}

/**
 * ufshcd_map_desc_id_to_length - map descriptor IDN to its length
 * @hba: Pointer to adapter instance
 * @desc_id: descriptor idn value
 * @desc_len: mapped desc length (out)
 *
 * Return 0 in case of success, non-zero otherwise
 */
int ufshcd_map_desc_id_to_length(struct ufs_hba *hba,
	enum desc_idn desc_id, int *desc_len)
{
	switch (desc_id) {
	case QUERY_DESC_IDN_DEVICE:
		*desc_len = hba->desc_size.dev_desc;
		break;
	case QUERY_DESC_IDN_POWER:
		*desc_len = hba->desc_size.pwr_desc;
		break;
	case QUERY_DESC_IDN_GEOMETRY:
		*desc_len = hba->desc_size.geom_desc;
		break;
	case QUERY_DESC_IDN_CONFIGURATION:
		*desc_len = hba->desc_size.conf_desc;
		break;
	case QUERY_DESC_IDN_UNIT:
		*desc_len = hba->desc_size.unit_desc;
		break;
	case QUERY_DESC_IDN_INTERCONNECT:
		*desc_len = hba->desc_size.interc_desc;
		break;
	case QUERY_DESC_IDN_STRING:
		*desc_len = QUERY_DESC_MAX_SIZE;
		break;
	case QUERY_DESC_IDN_HEALTH:
		*desc_len = hba->desc_size.hlth_desc;
		break;
	case QUERY_DESC_IDN_RFU_0:
	case QUERY_DESC_IDN_RFU_1:
		*desc_len = 0;
		break;
	default:
		*desc_len = 0;
		return -EINVAL;
	}
	return 0;
}
EXPORT_SYMBOL(ufshcd_map_desc_id_to_length);

/**
 * ufshcd_read_desc_param - read the specified descriptor parameter
 * @hba: Pointer to adapter instance
 * @desc_id: descriptor idn value
 * @desc_index: descriptor index
 * @param_offset: offset of the parameter to read
 * @param_read_buf: pointer to buffer where parameter would be read
 * @param_size: sizeof(param_read_buf)
 *
 * Return 0 in case of success, non-zero otherwise
 */
int ufshcd_read_desc_param(struct ufs_hba *hba,
			   enum desc_idn desc_id,
			   int desc_index,
			   u8 param_offset,
			   u8 *param_read_buf,
			   u8 param_size)
{
	int ret;
	u8 *desc_buf;
	int buff_len;
	bool is_kmalloc = true;

	/* Safety check */
	if (desc_id >= QUERY_DESC_IDN_MAX || !param_size)
		return -EINVAL;

	/* Get the max length of descriptor from structure filled up at probe
	 * time.
	 */
	ret = ufshcd_map_desc_id_to_length(hba, desc_id, &buff_len);

	/* Sanity checks */
	if (ret || !buff_len) {
		dev_err(hba->dev, "%s: Failed to get full descriptor length",
			__func__);
		return ret;
	}

	/* Check whether we need temp memory */
	if (param_offset != 0 || param_size < buff_len) {
		desc_buf = kmalloc(buff_len, GFP_KERNEL);
		if (!desc_buf)
			return -ENOMEM;
	} else {
		desc_buf = param_read_buf;
		is_kmalloc = false;
	}

	/* Request for full descriptor */
	ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
					desc_id, desc_index, 0,
					desc_buf, &buff_len);

	if (ret) {
		dev_err(hba->dev, "%s: Failed reading descriptor. desc_id %d, desc_index %d, param_offset %d, ret %d",
			__func__, desc_id, desc_index, param_offset, ret);
		goto out;
	}

	/* Sanity check */
	if (desc_buf[QUERY_DESC_DESC_TYPE_OFFSET] != desc_id) {
		dev_err(hba->dev, "%s: invalid desc_id %d in descriptor header",
			__func__, desc_buf[QUERY_DESC_DESC_TYPE_OFFSET]);
		ret = -EINVAL;
		goto out;
	}

	/* Check wherher we will not copy more data, than available */
	if (is_kmalloc && param_size > buff_len)
		param_size = buff_len;

	if (is_kmalloc)
		memcpy(param_read_buf, &desc_buf[param_offset], param_size);
out:
	if (is_kmalloc)
		kfree(desc_buf);
	return ret;
}

static inline int ufshcd_read_desc(struct ufs_hba *hba,
				   enum desc_idn desc_id,
				   int desc_index,
				   u8 *buf,
				   u32 size)
{
	return ufshcd_read_desc_param(hba, desc_id, desc_index, 0, buf, size);
}

static inline int ufshcd_read_power_desc(struct ufs_hba *hba,
					 u8 *buf,
					 u32 size)
{
	return ufshcd_read_desc(hba, QUERY_DESC_IDN_POWER, 0, buf, size);
}

static int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size)
{
	return ufshcd_read_desc(hba, QUERY_DESC_IDN_DEVICE, 0, buf, size);
}

/**
 * ufshcd_read_string_desc - read string descriptor
 * @hba: pointer to adapter instance
 * @desc_index: descriptor index
 * @buf: pointer to buffer where descriptor would be read
 * @size: size of buf
 * @ascii: if true convert from unicode to ascii characters
 *
 * Return 0 in case of success, non-zero otherwise
 */
int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index,
			    u8 *buf, u32 size, bool ascii)
{
	int err = 0;

	err = ufshcd_read_desc(hba,
				QUERY_DESC_IDN_STRING, desc_index, buf, size);

	if (err) {
		dev_err(hba->dev, "%s: reading String Desc failed after %d retries. err = %d\n",
			__func__, QUERY_REQ_RETRIES, err);
		goto out;
	}

	if (ascii) {
		int desc_len;
		int ascii_len;
		int i;
		char *buff_ascii;

		desc_len = buf[0];
		/* remove header and divide by 2 to move from UTF16 to UTF8 */
		ascii_len = (desc_len - QUERY_DESC_HDR_SIZE) / 2 + 1;
		if (size < ascii_len + QUERY_DESC_HDR_SIZE) {
			dev_err(hba->dev, "%s: buffer allocated size is too small\n",
					__func__);
			err = -ENOMEM;
			goto out;
		}

		buff_ascii = kmalloc(ascii_len, GFP_KERNEL);
		if (!buff_ascii) {
			err = -ENOMEM;
			goto out;
		}

		/*
		 * the descriptor contains string in UTF16 format
		 * we need to convert to utf-8 so it can be displayed
		 */
		utf16s_to_utf8s((wchar_t *)&buf[QUERY_DESC_HDR_SIZE],
				desc_len - QUERY_DESC_HDR_SIZE,
				UTF16_BIG_ENDIAN, buff_ascii, ascii_len);

		/* replace non-printable or non-ASCII characters with spaces */
		for (i = 0; i < ascii_len; i++)
			ufshcd_remove_non_printable(&buff_ascii[i]);

		memset(buf + QUERY_DESC_HDR_SIZE, 0,
				size - QUERY_DESC_HDR_SIZE);
		memcpy(buf + QUERY_DESC_HDR_SIZE, buff_ascii, ascii_len);
		buf[QUERY_DESC_LENGTH_OFFSET] = ascii_len + QUERY_DESC_HDR_SIZE;
		kfree(buff_ascii);
	}
out:
	return err;
}

/**
 * ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
 * @hba: Pointer to adapter instance
 * @lun: lun id
 * @param_offset: offset of the parameter to read
 * @param_read_buf: pointer to buffer where parameter would be read
 * @param_size: sizeof(param_read_buf)
 *
 * Return 0 in case of success, non-zero otherwise
 */
static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
					      int lun,
					      enum unit_desc_param param_offset,
					      u8 *param_read_buf,
					      u32 param_size)
{
	/*
	 * Unit descriptors are only available for general purpose LUs (LUN id
	 * from 0 to 7) and RPMB Well known LU.
	 */
	if (!ufs_is_valid_unit_desc_lun(lun))
		return -EOPNOTSUPP;

	return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
				      param_offset, param_read_buf, param_size);
}

/**
 * ufshcd_memory_alloc - allocate memory for host memory space data structures
 * @hba: per adapter instance
 *
 * 1. Allocate DMA memory for Command Descriptor array
 *	Each command descriptor consist of Command UPIU, Response UPIU and PRDT
 * 2. Allocate DMA memory for UTP Transfer Request Descriptor List (UTRDL).
 * 3. Allocate DMA memory for UTP Task Management Request Descriptor List
 *	(UTMRDL)
 * 4. Allocate memory for local reference block(lrb).
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_memory_alloc(struct ufs_hba *hba)
{
	size_t utmrdl_size, utrdl_size, ucdl_size;

	/* Allocate memory for UTP command descriptors */
	ucdl_size = (sizeof(struct utp_transfer_cmd_desc) * hba->nutrs);
	hba->ucdl_base_addr = dmam_alloc_coherent(hba->dev,
						  ucdl_size,
						  &hba->ucdl_dma_addr,
						  GFP_KERNEL);

	/*
	 * UFSHCI requires UTP command descriptor to be 128 byte aligned.
	 * make sure hba->ucdl_dma_addr is aligned to PAGE_SIZE
	 * if hba->ucdl_dma_addr is aligned to PAGE_SIZE, then it will
	 * be aligned to 128 bytes as well
	 */
	if (!hba->ucdl_base_addr ||
	    WARN_ON(hba->ucdl_dma_addr & (PAGE_SIZE - 1))) {
		dev_err(hba->dev,
			"Command Descriptor Memory allocation failed\n");
		goto out;
	}

	/*
	 * Allocate memory for UTP Transfer descriptors
	 * UFSHCI requires 1024 byte alignment of UTRD
	 */
	utrdl_size = (sizeof(struct utp_transfer_req_desc) * hba->nutrs);
	hba->utrdl_base_addr = dmam_alloc_coherent(hba->dev,
						   utrdl_size,
						   &hba->utrdl_dma_addr,
						   GFP_KERNEL);
	if (!hba->utrdl_base_addr ||
	    WARN_ON(hba->utrdl_dma_addr & (PAGE_SIZE - 1))) {
		dev_err(hba->dev,
			"Transfer Descriptor Memory allocation failed\n");
		goto out;
	}

	/*
	 * Allocate memory for UTP Task Management descriptors
	 * UFSHCI requires 1024 byte alignment of UTMRD
	 */
	utmrdl_size = sizeof(struct utp_task_req_desc) * hba->nutmrs;
	hba->utmrdl_base_addr = dmam_alloc_coherent(hba->dev,
						    utmrdl_size,
						    &hba->utmrdl_dma_addr,
						    GFP_KERNEL);
	if (!hba->utmrdl_base_addr ||
	    WARN_ON(hba->utmrdl_dma_addr & (PAGE_SIZE - 1))) {
		dev_err(hba->dev,
		"Task Management Descriptor Memory allocation failed\n");
		goto out;
	}

	/* Allocate memory for local reference block */
	hba->lrb = devm_kcalloc(hba->dev,
				hba->nutrs, sizeof(struct ufshcd_lrb),
				GFP_KERNEL);
	if (!hba->lrb) {
		dev_err(hba->dev, "LRB Memory allocation failed\n");
		goto out;
	}
	return 0;
out:
	return -ENOMEM;
}

/**
 * ufshcd_host_memory_configure - configure local reference block with
 *				memory offsets
 * @hba: per adapter instance
 *
 * Configure Host memory space
 * 1. Update Corresponding UTRD.UCDBA and UTRD.UCDBAU with UCD DMA
 * address.
 * 2. Update each UTRD with Response UPIU offset, Response UPIU length
 * and PRDT offset.
 * 3. Save the corresponding addresses of UTRD, UCD.CMD, UCD.RSP and UCD.PRDT
 * into local reference block.
 */
static void ufshcd_host_memory_configure(struct ufs_hba *hba)
{
	struct utp_transfer_cmd_desc *cmd_descp;
	struct utp_transfer_req_desc *utrdlp;
	dma_addr_t cmd_desc_dma_addr;
	dma_addr_t cmd_desc_element_addr;
	u16 response_offset;
	u16 prdt_offset;
	int cmd_desc_size;
	int i;

	utrdlp = hba->utrdl_base_addr;
	cmd_descp = hba->ucdl_base_addr;

	response_offset =
		offsetof(struct utp_transfer_cmd_desc, response_upiu);
	prdt_offset =
		offsetof(struct utp_transfer_cmd_desc, prd_table);

	cmd_desc_size = sizeof(struct utp_transfer_cmd_desc);
	cmd_desc_dma_addr = hba->ucdl_dma_addr;

	for (i = 0; i < hba->nutrs; i++) {
		/* Configure UTRD with command descriptor base address */
		cmd_desc_element_addr =
				(cmd_desc_dma_addr + (cmd_desc_size * i));
		utrdlp[i].command_desc_base_addr_lo =
				cpu_to_le32(lower_32_bits(cmd_desc_element_addr));
		utrdlp[i].command_desc_base_addr_hi =
				cpu_to_le32(upper_32_bits(cmd_desc_element_addr));

		/* Response upiu and prdt offset should be in double words */
		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
			utrdlp[i].response_upiu_offset =
				cpu_to_le16(response_offset);
			utrdlp[i].prd_table_offset =
				cpu_to_le16(prdt_offset);
			utrdlp[i].response_upiu_length =
				cpu_to_le16(ALIGNED_UPIU_SIZE);
		} else {
			utrdlp[i].response_upiu_offset =
				cpu_to_le16((response_offset >> 2));
			utrdlp[i].prd_table_offset =
				cpu_to_le16((prdt_offset >> 2));
			utrdlp[i].response_upiu_length =
				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
		}

		hba->lrb[i].utr_descriptor_ptr = (utrdlp + i);
		hba->lrb[i].utrd_dma_addr = hba->utrdl_dma_addr +
				(i * sizeof(struct utp_transfer_req_desc));
		hba->lrb[i].ucd_req_ptr =
			(struct utp_upiu_req *)(cmd_descp + i);
		hba->lrb[i].ucd_req_dma_addr = cmd_desc_element_addr;
		hba->lrb[i].ucd_rsp_ptr =
			(struct utp_upiu_rsp *)cmd_descp[i].response_upiu;
		hba->lrb[i].ucd_rsp_dma_addr = cmd_desc_element_addr +
				response_offset;
		hba->lrb[i].ucd_prdt_ptr =
			(struct ufshcd_sg_entry *)cmd_descp[i].prd_table;
		hba->lrb[i].ucd_prdt_dma_addr = cmd_desc_element_addr +
				prdt_offset;
	}
}

/**
 * ufshcd_dme_link_startup - Notify Unipro to perform link startup
 * @hba: per adapter instance
 *
 * UIC_CMD_DME_LINK_STARTUP command must be issued to Unipro layer,
 * in order to initialize the Unipro link startup procedure.
 * Once the Unipro links are up, the device connected to the controller
 * is detected.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_link_startup(struct ufs_hba *hba)
{
	struct uic_command uic_cmd = {0};
	int ret;

	uic_cmd.command = UIC_CMD_DME_LINK_STARTUP;

	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
	if (ret)
		dev_dbg(hba->dev,
			"dme-link-startup: error code %d\n", ret);
	return ret;
}
/**
 * ufshcd_dme_reset - UIC command for DME_RESET
 * @hba: per adapter instance
 *
 * DME_RESET command is issued in order to reset UniPro stack.
 * This function now deal with cold reset.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_reset(struct ufs_hba *hba)
{
	struct uic_command uic_cmd = {0};
	int ret;

	uic_cmd.command = UIC_CMD_DME_RESET;

	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
	if (ret)
		dev_err(hba->dev,
			"dme-reset: error code %d\n", ret);

	return ret;
}

/**
 * ufshcd_dme_enable - UIC command for DME_ENABLE
 * @hba: per adapter instance
 *
 * DME_ENABLE command is issued in order to enable UniPro stack.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_dme_enable(struct ufs_hba *hba)
{
	struct uic_command uic_cmd = {0};
	int ret;

	uic_cmd.command = UIC_CMD_DME_ENABLE;

	ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
	if (ret)
		dev_err(hba->dev,
			"dme-reset: error code %d\n", ret);

	return ret;
}

static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba)
{
	#define MIN_DELAY_BEFORE_DME_CMDS_US	1000
	unsigned long min_sleep_time_us;

	if (!(hba->quirks & UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS))
		return;

	/*
	 * last_dme_cmd_tstamp will be 0 only for 1st call to
	 * this function
	 */
	if (unlikely(!ktime_to_us(hba->last_dme_cmd_tstamp))) {
		min_sleep_time_us = MIN_DELAY_BEFORE_DME_CMDS_US;
	} else {
		unsigned long delta =
			(unsigned long) ktime_to_us(
				ktime_sub(ktime_get(),
				hba->last_dme_cmd_tstamp));

		if (delta < MIN_DELAY_BEFORE_DME_CMDS_US)
			min_sleep_time_us =
				MIN_DELAY_BEFORE_DME_CMDS_US - delta;
		else
			return; /* no more delay required */
	}

	/* allow sleep for extra 50us if needed */
	usleep_range(min_sleep_time_us, min_sleep_time_us + 50);
}

/**
 * ufshcd_dme_set_attr - UIC command for DME_SET, DME_PEER_SET
 * @hba: per adapter instance
 * @attr_sel: uic command argument1
 * @attr_set: attribute set type as uic command argument2
 * @mib_val: setting value as uic command argument3
 * @peer: indicate whether peer or local
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
			u8 attr_set, u32 mib_val, u8 peer)
{
	struct uic_command uic_cmd = {0};
	static const char *const action[] = {
		"dme-set",
		"dme-peer-set"
	};
	const char *set = action[!!peer];
	int ret;
	int retries = UFS_UIC_COMMAND_RETRIES;

	uic_cmd.command = peer ?
		UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
	uic_cmd.argument1 = attr_sel;
	uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
	uic_cmd.argument3 = mib_val;

	do {
		/* for peer attributes we retry upon failure */
		ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
		if (ret)
			dev_dbg(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
				set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
	} while (ret && peer && --retries);

	if (ret)
		dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x failed %d retries\n",
			set, UIC_GET_ATTR_ID(attr_sel), mib_val,
			UFS_UIC_COMMAND_RETRIES - retries);

	return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_set_attr);

/**
 * ufshcd_dme_get_attr - UIC command for DME_GET, DME_PEER_GET
 * @hba: per adapter instance
 * @attr_sel: uic command argument1
 * @mib_val: the value of the attribute as returned by the UIC command
 * @peer: indicate whether peer or local
 *
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
			u32 *mib_val, u8 peer)
{
	struct uic_command uic_cmd = {0};
	static const char *const action[] = {
		"dme-get",
		"dme-peer-get"
	};
	const char *get = action[!!peer];
	int ret;
	int retries = UFS_UIC_COMMAND_RETRIES;
	struct ufs_pa_layer_attr orig_pwr_info;
	struct ufs_pa_layer_attr temp_pwr_info;
	bool pwr_mode_change = false;

	if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)) {
		orig_pwr_info = hba->pwr_info;
		temp_pwr_info = orig_pwr_info;

		if (orig_pwr_info.pwr_tx == FAST_MODE ||
		    orig_pwr_info.pwr_rx == FAST_MODE) {
			temp_pwr_info.pwr_tx = FASTAUTO_MODE;
			temp_pwr_info.pwr_rx = FASTAUTO_MODE;
			pwr_mode_change = true;
		} else if (orig_pwr_info.pwr_tx == SLOW_MODE ||
		    orig_pwr_info.pwr_rx == SLOW_MODE) {
			temp_pwr_info.pwr_tx = SLOWAUTO_MODE;
			temp_pwr_info.pwr_rx = SLOWAUTO_MODE;
			pwr_mode_change = true;
		}
		if (pwr_mode_change) {
			ret = ufshcd_change_power_mode(hba, &temp_pwr_info);
			if (ret)
				goto out;
		}
	}

	uic_cmd.command = peer ?
		UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
	uic_cmd.argument1 = attr_sel;

	do {
		/* for peer attributes we retry upon failure */
		ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
		if (ret)
			dev_dbg(hba->dev, "%s: attr-id 0x%x error code %d\n",
				get, UIC_GET_ATTR_ID(attr_sel), ret);
	} while (ret && peer && --retries);

	if (ret)
		dev_err(hba->dev, "%s: attr-id 0x%x failed %d retries\n",
			get, UIC_GET_ATTR_ID(attr_sel),
			UFS_UIC_COMMAND_RETRIES - retries);

	if (mib_val && !ret)
		*mib_val = uic_cmd.argument3;

	if (peer && (hba->quirks & UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE)
	    && pwr_mode_change)
		ufshcd_change_power_mode(hba, &orig_pwr_info);
out:
	return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);

/**
 * ufshcd_uic_pwr_ctrl - executes UIC commands (which affects the link power
 * state) and waits for it to take effect.
 *
 * @hba: per adapter instance
 * @cmd: UIC command to execute
 *
 * DME operations like DME_SET(PA_PWRMODE), DME_HIBERNATE_ENTER &
 * DME_HIBERNATE_EXIT commands take some time to take its effect on both host
 * and device UniPro link and hence it's final completion would be indicated by
 * dedicated status bits in Interrupt Status register (UPMS, UHES, UHXS) in
 * addition to normal UIC command completion Status (UCCS). This function only
 * returns after the relevant status bits indicate the completion.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
{
	struct completion uic_async_done;
	unsigned long flags;
	u8 status;
	int ret;
	bool reenable_intr = false;

	mutex_lock(&hba->uic_cmd_mutex);
	init_completion(&uic_async_done);
	ufshcd_add_delay_before_dme_cmd(hba);

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->uic_async_done = &uic_async_done;
	if (ufshcd_readl(hba, REG_INTERRUPT_ENABLE) & UIC_COMMAND_COMPL) {
		ufshcd_disable_intr(hba, UIC_COMMAND_COMPL);
		/*
		 * Make sure UIC command completion interrupt is disabled before
		 * issuing UIC command.
		 */
		wmb();
		reenable_intr = true;
	}
	ret = __ufshcd_send_uic_cmd(hba, cmd, false);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	if (ret) {
		dev_err(hba->dev,
			"pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
			cmd->command, cmd->argument3, ret);
		goto out;
	}

	if (!wait_for_completion_timeout(hba->uic_async_done,
					 msecs_to_jiffies(UIC_CMD_TIMEOUT))) {
		dev_err(hba->dev,
			"pwr ctrl cmd 0x%x with mode 0x%x completion timeout\n",
			cmd->command, cmd->argument3);
		ret = -ETIMEDOUT;
		goto out;
	}

	status = ufshcd_get_upmcrs(hba);
	if (status != PWR_LOCAL) {
		dev_err(hba->dev,
			"pwr ctrl cmd 0x%x failed, host upmcrs:0x%x\n",
			cmd->command, status);
		ret = (status != PWR_OK) ? status : -1;
	}
out:
	if (ret) {
		ufshcd_print_host_state(hba);
		ufshcd_print_pwr_info(hba);
		ufshcd_print_host_regs(hba);
	}

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->active_uic_cmd = NULL;
	hba->uic_async_done = NULL;
	if (reenable_intr)
		ufshcd_enable_intr(hba, UIC_COMMAND_COMPL);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	mutex_unlock(&hba->uic_cmd_mutex);

	return ret;
}

/**
 * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage
 *				using DME_SET primitives.
 * @hba: per adapter instance
 * @mode: powr mode value
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_uic_change_pwr_mode(struct ufs_hba *hba, u8 mode)
{
	struct uic_command uic_cmd = {0};
	int ret;

	if (hba->quirks & UFSHCD_QUIRK_BROKEN_PA_RXHSUNTERMCAP) {
		ret = ufshcd_dme_set(hba,
				UIC_ARG_MIB_SEL(PA_RXHSUNTERMCAP, 0), 1);
		if (ret) {
			dev_err(hba->dev, "%s: failed to enable PA_RXHSUNTERMCAP ret %d\n",
						__func__, ret);
			goto out;
		}
	}

	uic_cmd.command = UIC_CMD_DME_SET;
	uic_cmd.argument1 = UIC_ARG_MIB(PA_PWRMODE);
	uic_cmd.argument3 = mode;
	ufshcd_hold(hba, false);
	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
	ufshcd_release(hba);

out:
	return ret;
}

static int ufshcd_link_recovery(struct ufs_hba *hba)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(hba->host->host_lock, flags);
	hba->ufshcd_state = UFSHCD_STATE_RESET;
	ufshcd_set_eh_in_progress(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	ret = ufshcd_host_reset_and_restore(hba);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (ret)
		hba->ufshcd_state = UFSHCD_STATE_ERROR;
	ufshcd_clear_eh_in_progress(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (ret)
		dev_err(hba->dev, "%s: link recovery failed, err %d",
			__func__, ret);

	return ret;
}

static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
{
	int ret;
	struct uic_command uic_cmd = {0};
	ktime_t start = ktime_get();

	ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER, PRE_CHANGE);

	uic_cmd.command = UIC_CMD_DME_HIBER_ENTER;
	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
	trace_ufshcd_profile_hibern8(dev_name(hba->dev), "enter",
			     ktime_to_us(ktime_sub(ktime_get(), start)), ret);

	if (ret) {
		dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n",
			__func__, ret);

		/*
		 * If link recovery fails then return error so that caller
		 * don't retry the hibern8 enter again.
		 */
		if (ufshcd_link_recovery(hba))
			ret = -ENOLINK;
	} else
		ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER,
								POST_CHANGE);

	return ret;
}

static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba)
{
	int ret = 0, retries;

	for (retries = UIC_HIBERN8_ENTER_RETRIES; retries > 0; retries--) {
		ret = __ufshcd_uic_hibern8_enter(hba);
		if (!ret || ret == -ENOLINK)
			goto out;
	}
out:
	return ret;
}

static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba)
{
	struct uic_command uic_cmd = {0};
	int ret;
	ktime_t start = ktime_get();

	ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT, PRE_CHANGE);

	uic_cmd.command = UIC_CMD_DME_HIBER_EXIT;
	ret = ufshcd_uic_pwr_ctrl(hba, &uic_cmd);
	trace_ufshcd_profile_hibern8(dev_name(hba->dev), "exit",
			     ktime_to_us(ktime_sub(ktime_get(), start)), ret);

	if (ret) {
		dev_err(hba->dev, "%s: hibern8 exit failed. ret = %d\n",
			__func__, ret);
		ret = ufshcd_link_recovery(hba);
	} else {
		ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT,
								POST_CHANGE);
		hba->ufs_stats.last_hibern8_exit_tstamp = ktime_get();
		hba->ufs_stats.hibern8_exit_cnt++;
	}

	return ret;
}

static void ufshcd_auto_hibern8_enable(struct ufs_hba *hba)
{
	unsigned long flags;

	if (!ufshcd_is_auto_hibern8_supported(hba) || !hba->ahit)
		return;

	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_writel(hba, hba->ahit, REG_AUTO_HIBERNATE_IDLE_TIMER);
	spin_unlock_irqrestore(hba->host->host_lock, flags);
}

 /**
 * ufshcd_init_pwr_info - setting the POR (power on reset)
 * values in hba power info
 * @hba: per-adapter instance
 */
static void ufshcd_init_pwr_info(struct ufs_hba *hba)
{
	hba->pwr_info.gear_rx = UFS_PWM_G1;
	hba->pwr_info.gear_tx = UFS_PWM_G1;
	hba->pwr_info.lane_rx = 1;
	hba->pwr_info.lane_tx = 1;
	hba->pwr_info.pwr_rx = SLOWAUTO_MODE;
	hba->pwr_info.pwr_tx = SLOWAUTO_MODE;
	hba->pwr_info.hs_rate = 0;
}

/**
 * ufshcd_get_max_pwr_mode - reads the max power mode negotiated with device
 * @hba: per-adapter instance
 */
static int ufshcd_get_max_pwr_mode(struct ufs_hba *hba)
{
	struct ufs_pa_layer_attr *pwr_info = &hba->max_pwr_info.info;

	if (hba->max_pwr_info.is_valid)
		return 0;

	pwr_info->pwr_tx = FAST_MODE;
	pwr_info->pwr_rx = FAST_MODE;
	pwr_info->hs_rate = PA_HS_MODE_B;

	/* Get the connected lane count */
	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDRXDATALANES),
			&pwr_info->lane_rx);
	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
			&pwr_info->lane_tx);

	if (!pwr_info->lane_rx || !pwr_info->lane_tx) {
		dev_err(hba->dev, "%s: invalid connected lanes value. rx=%d, tx=%d\n",
				__func__,
				pwr_info->lane_rx,
				pwr_info->lane_tx);
		return -EINVAL;
	}

	/*
	 * First, get the maximum gears of HS speed.
	 * If a zero value, it means there is no HSGEAR capability.
	 * Then, get the maximum gears of PWM speed.
	 */
	ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR), &pwr_info->gear_rx);
	if (!pwr_info->gear_rx) {
		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
				&pwr_info->gear_rx);
		if (!pwr_info->gear_rx) {
			dev_err(hba->dev, "%s: invalid max pwm rx gear read = %d\n",
				__func__, pwr_info->gear_rx);
			return -EINVAL;
		}
		pwr_info->pwr_rx = SLOW_MODE;
	}

	ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXHSGEAR),
			&pwr_info->gear_tx);
	if (!pwr_info->gear_tx) {
		ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_MAXRXPWMGEAR),
				&pwr_info->gear_tx);
		if (!pwr_info->gear_tx) {
			dev_err(hba->dev, "%s: invalid max pwm tx gear read = %d\n",
				__func__, pwr_info->gear_tx);
			return -EINVAL;
		}
		pwr_info->pwr_tx = SLOW_MODE;
	}

	hba->max_pwr_info.is_valid = true;
	return 0;
}

static int ufshcd_change_power_mode(struct ufs_hba *hba,
			     struct ufs_pa_layer_attr *pwr_mode)
{
	int ret;

	/* if already configured to the requested pwr_mode */
	if (pwr_mode->gear_rx == hba->pwr_info.gear_rx &&
	    pwr_mode->gear_tx == hba->pwr_info.gear_tx &&
	    pwr_mode->lane_rx == hba->pwr_info.lane_rx &&
	    pwr_mode->lane_tx == hba->pwr_info.lane_tx &&
	    pwr_mode->pwr_rx == hba->pwr_info.pwr_rx &&
	    pwr_mode->pwr_tx == hba->pwr_info.pwr_tx &&
	    pwr_mode->hs_rate == hba->pwr_info.hs_rate) {
		dev_dbg(hba->dev, "%s: power already configured\n", __func__);
		return 0;
	}

	/*
	 * Configure attributes for power mode change with below.
	 * - PA_RXGEAR, PA_ACTIVERXDATALANES, PA_RXTERMINATION,
	 * - PA_TXGEAR, PA_ACTIVETXDATALANES, PA_TXTERMINATION,
	 * - PA_HSSERIES
	 */
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), pwr_mode->gear_rx);
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
			pwr_mode->lane_rx);
	if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
			pwr_mode->pwr_rx == FAST_MODE)
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), TRUE);
	else
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), FALSE);

	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), pwr_mode->gear_tx);
	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
			pwr_mode->lane_tx);
	if (pwr_mode->pwr_tx == FASTAUTO_MODE ||
			pwr_mode->pwr_tx == FAST_MODE)
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), TRUE);
	else
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), FALSE);

	if (pwr_mode->pwr_rx == FASTAUTO_MODE ||
	    pwr_mode->pwr_tx == FASTAUTO_MODE ||
	    pwr_mode->pwr_rx == FAST_MODE ||
	    pwr_mode->pwr_tx == FAST_MODE)
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
						pwr_mode->hs_rate);

	ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
			| pwr_mode->pwr_tx);

	if (ret) {
		dev_err(hba->dev,
			"%s: power mode change failed %d\n", __func__, ret);
	} else {
		ufshcd_vops_pwr_change_notify(hba, POST_CHANGE, NULL,
								pwr_mode);

		memcpy(&hba->pwr_info, pwr_mode,
			sizeof(struct ufs_pa_layer_attr));
	}

	return ret;
}

/**
 * ufshcd_config_pwr_mode - configure a new power mode
 * @hba: per-adapter instance
 * @desired_pwr_mode: desired power configuration
 */
int ufshcd_config_pwr_mode(struct ufs_hba *hba,
		struct ufs_pa_layer_attr *desired_pwr_mode)
{
	struct ufs_pa_layer_attr final_params = { 0 };
	int ret;

	ret = ufshcd_vops_pwr_change_notify(hba, PRE_CHANGE,
					desired_pwr_mode, &final_params);

	if (ret)
		memcpy(&final_params, desired_pwr_mode, sizeof(final_params));

	ret = ufshcd_change_power_mode(hba, &final_params);
	if (!ret)
		ufshcd_print_pwr_info(hba);

	return ret;
}
EXPORT_SYMBOL_GPL(ufshcd_config_pwr_mode);

/**
 * ufshcd_complete_dev_init() - checks device readiness
 * @hba: per-adapter instance
 *
 * Set fDeviceInit flag and poll until device toggles it.
 */
static int ufshcd_complete_dev_init(struct ufs_hba *hba)
{
	int i;
	int err;
	bool flag_res = 1;

	err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
		QUERY_FLAG_IDN_FDEVICEINIT, NULL);
	if (err) {
		dev_err(hba->dev,
			"%s setting fDeviceInit flag failed with error %d\n",
			__func__, err);
		goto out;
	}

	/* poll for max. 1000 iterations for fDeviceInit flag to clear */
	for (i = 0; i < 1000 && !err && flag_res; i++)
		err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
			QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);

	if (err)
		dev_err(hba->dev,
			"%s reading fDeviceInit flag failed with error %d\n",
			__func__, err);
	else if (flag_res)
		dev_err(hba->dev,
			"%s fDeviceInit was not cleared by the device\n",
			__func__);

out:
	return err;
}

/**
 * ufshcd_make_hba_operational - Make UFS controller operational
 * @hba: per adapter instance
 *
 * To bring UFS host controller to operational state,
 * 1. Enable required interrupts
 * 2. Configure interrupt aggregation
 * 3. Program UTRL and UTMRL base address
 * 4. Configure run-stop-registers
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_make_hba_operational(struct ufs_hba *hba)
{
	int err = 0;
	u32 reg;

	/* Enable required interrupts */
	ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);

	/* Configure interrupt aggregation */
	if (ufshcd_is_intr_aggr_allowed(hba))
		ufshcd_config_intr_aggr(hba, hba->nutrs - 1, INT_AGGR_DEF_TO);
	else
		ufshcd_disable_intr_aggr(hba);

	/* Configure UTRL and UTMRL base address registers */
	ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
			REG_UTP_TRANSFER_REQ_LIST_BASE_L);
	ufshcd_writel(hba, upper_32_bits(hba->utrdl_dma_addr),
			REG_UTP_TRANSFER_REQ_LIST_BASE_H);
	ufshcd_writel(hba, lower_32_bits(hba->utmrdl_dma_addr),
			REG_UTP_TASK_REQ_LIST_BASE_L);
	ufshcd_writel(hba, upper_32_bits(hba->utmrdl_dma_addr),
			REG_UTP_TASK_REQ_LIST_BASE_H);

	/*
	 * Make sure base address and interrupt setup are updated before
	 * enabling the run/stop registers below.
	 */
	wmb();

	/*
	 * UCRDY, UTMRLDY and UTRLRDY bits must be 1
	 */
	reg = ufshcd_readl(hba, REG_CONTROLLER_STATUS);
	if (!(ufshcd_get_lists_status(reg))) {
		ufshcd_enable_run_stop_reg(hba);
	} else {
		dev_err(hba->dev,
			"Host controller not ready to process requests");
		err = -EIO;
		goto out;
	}

out:
	return err;
}

/**
 * ufshcd_hba_stop - Send controller to reset state
 * @hba: per adapter instance
 * @can_sleep: perform sleep or just spin
 */
static inline void ufshcd_hba_stop(struct ufs_hba *hba, bool can_sleep)
{
	int err;

	ufshcd_writel(hba, CONTROLLER_DISABLE,  REG_CONTROLLER_ENABLE);
	err = ufshcd_wait_for_register(hba, REG_CONTROLLER_ENABLE,
					CONTROLLER_ENABLE, CONTROLLER_DISABLE,
					10, 1, can_sleep);
	if (err)
		dev_err(hba->dev, "%s: Controller disable failed\n", __func__);
}

/**
 * ufshcd_hba_execute_hce - initialize the controller
 * @hba: per adapter instance
 *
 * The controller resets itself and controller firmware initialization
 * sequence kicks off. When controller is ready it will set
 * the Host Controller Enable bit to 1.
 *
 * Returns 0 on success, non-zero value on failure
 */
static int ufshcd_hba_execute_hce(struct ufs_hba *hba)
{
	int retry;

	/*
	 * msleep of 1 and 5 used in this function might result in msleep(20),
	 * but it was necessary to send the UFS FPGA to reset mode during
	 * development and testing of this driver. msleep can be changed to
	 * mdelay and retry count can be reduced based on the controller.
	 */
	if (!ufshcd_is_hba_active(hba))
		/* change controller state to "reset state" */
		ufshcd_hba_stop(hba, true);

	/* UniPro link is disabled at this point */
	ufshcd_set_link_off(hba);

	ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);

	/* start controller initialization sequence */
	ufshcd_hba_start(hba);

	/*
	 * To initialize a UFS host controller HCE bit must be set to 1.
	 * During initialization the HCE bit value changes from 1->0->1.
	 * When the host controller completes initialization sequence
	 * it sets the value of HCE bit to 1. The same HCE bit is read back
	 * to check if the controller has completed initialization sequence.
	 * So without this delay the value HCE = 1, set in the previous
	 * instruction might be read back.
	 * This delay can be changed based on the controller.
	 */
	msleep(1);

	/* wait for the host controller to complete initialization */
	retry = 10;
	while (ufshcd_is_hba_active(hba)) {
		if (retry) {
			retry--;
		} else {
			dev_err(hba->dev,
				"Controller enable failed\n");
			return -EIO;
		}
		msleep(5);
	}

	/* enable UIC related interrupts */
	ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);

	ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);

	return 0;
}

static int ufshcd_hba_enable(struct ufs_hba *hba)
{
	int ret;

	if (hba->quirks & UFSHCI_QUIRK_BROKEN_HCE) {
		ufshcd_set_link_off(hba);
		ufshcd_vops_hce_enable_notify(hba, PRE_CHANGE);

		/* enable UIC related interrupts */
		ufshcd_enable_intr(hba, UFSHCD_UIC_MASK);
		ret = ufshcd_dme_reset(hba);
		if (!ret) {
			ret = ufshcd_dme_enable(hba);
			if (!ret)
				ufshcd_vops_hce_enable_notify(hba, POST_CHANGE);
			if (ret)
				dev_err(hba->dev,
					"Host controller enable failed with non-hce\n");
		}
	} else {
		ret = ufshcd_hba_execute_hce(hba);
	}

	return ret;
}
static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)
{
	int tx_lanes, i, err = 0;

	if (!peer)
		ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
			       &tx_lanes);
	else
		ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
				    &tx_lanes);
	for (i = 0; i < tx_lanes; i++) {
		if (!peer)
			err = ufshcd_dme_set(hba,
				UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
					0);
		else
			err = ufshcd_dme_peer_set(hba,
				UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
					0);
		if (err) {
			dev_err(hba->dev, "%s: TX LCC Disable failed, peer = %d, lane = %d, err = %d",
				__func__, peer, i, err);
			break;
		}
	}

	return err;
}

static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba)
{
	return ufshcd_disable_tx_lcc(hba, true);
}

/**
 * ufshcd_link_startup - Initialize unipro link startup
 * @hba: per adapter instance
 *
 * Returns 0 for success, non-zero in case of failure
 */
static int ufshcd_link_startup(struct ufs_hba *hba)
{
	int ret;
	int retries = DME_LINKSTARTUP_RETRIES;
	bool link_startup_again = false;

	/*
	 * If UFS device isn't active then we will have to issue link startup
	 * 2 times to make sure the device state move to active.
	 */
	if (!ufshcd_is_ufs_dev_active(hba))
		link_startup_again = true;

link_startup:
	do {
		ufshcd_vops_link_startup_notify(hba, PRE_CHANGE);

		ret = ufshcd_dme_link_startup(hba);

		/* check if device is detected by inter-connect layer */
		if (!ret && !ufshcd_is_device_present(hba)) {
			dev_err(hba->dev, "%s: Device not present\n", __func__);
			ret = -ENXIO;
			goto out;
		}

		/*
		 * DME link lost indication is only received when link is up,
		 * but we can't be sure if the link is up until link startup
		 * succeeds. So reset the local Uni-Pro and try again.
		 */
		if (ret && ufshcd_hba_enable(hba))
			goto out;
	} while (ret && retries--);

	if (ret)
		/* failed to get the link up... retire */
		goto out;

	if (link_startup_again) {
		link_startup_again = false;
		retries = DME_LINKSTARTUP_RETRIES;
		goto link_startup;
	}

	/* Mark that link is up in PWM-G1, 1-lane, SLOW-AUTO mode */
	ufshcd_init_pwr_info(hba);
	ufshcd_print_pwr_info(hba);

	if (hba->quirks & UFSHCD_QUIRK_BROKEN_LCC) {
		ret = ufshcd_disable_device_tx_lcc(hba);
		if (ret)
			goto out;
	}

	/* Include any host controller configuration via UIC commands */
	ret = ufshcd_vops_link_startup_notify(hba, POST_CHANGE);
	if (ret)
		goto out;

	ret = ufshcd_make_hba_operational(hba);
out:
	if (ret) {
		dev_err(hba->dev, "link startup failed %d\n", ret);
		ufshcd_print_host_state(hba);
		ufshcd_print_pwr_info(hba);
		ufshcd_print_host_regs(hba);
	}
	return ret;
}

/**
 * ufshcd_verify_dev_init() - Verify device initialization
 * @hba: per-adapter instance
 *
 * Send NOP OUT UPIU and wait for NOP IN response to check whether the
 * device Transport Protocol (UTP) layer is ready after a reset.
 * If the UTP layer at the device side is not initialized, it may
 * not respond with NOP IN UPIU within timeout of %NOP_OUT_TIMEOUT
 * and we retry sending NOP OUT for %NOP_OUT_RETRIES iterations.
 */
static int ufshcd_verify_dev_init(struct ufs_hba *hba)
{
	int err = 0;
	int retries;

	ufshcd_hold(hba, false);
	mutex_lock(&hba->dev_cmd.lock);
	for (retries = NOP_OUT_RETRIES; retries > 0; retries--) {
		err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_NOP,
					       NOP_OUT_TIMEOUT);

		if (!err || err == -ETIMEDOUT)
			break;

		dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
	}
	mutex_unlock(&hba->dev_cmd.lock);
	ufshcd_release(hba);

	if (err)
		dev_err(hba->dev, "%s: NOP OUT failed %d\n", __func__, err);
	return err;
}

/**
 * ufshcd_set_queue_depth - set lun queue depth
 * @sdev: pointer to SCSI device
 *
 * Read bLUQueueDepth value and activate scsi tagged command
 * queueing. For WLUN, queue depth is set to 1. For best-effort
 * cases (bLUQueueDepth = 0) the queue depth is set to a maximum
 * value that host can queue.
 */
static void ufshcd_set_queue_depth(struct scsi_device *sdev)
{
	int ret = 0;
	u8 lun_qdepth;
	struct ufs_hba *hba;

	hba = shost_priv(sdev->host);

	lun_qdepth = hba->nutrs;
	ret = ufshcd_read_unit_desc_param(hba,
					  ufshcd_scsi_to_upiu_lun(sdev->lun),
					  UNIT_DESC_PARAM_LU_Q_DEPTH,
					  &lun_qdepth,
					  sizeof(lun_qdepth));

	/* Some WLUN doesn't support unit descriptor */
	if (ret == -EOPNOTSUPP)
		lun_qdepth = 1;
	else if (!lun_qdepth)
		/* eventually, we can figure out the real queue depth */
		lun_qdepth = hba->nutrs;
	else
		lun_qdepth = min_t(int, lun_qdepth, hba->nutrs);

	dev_dbg(hba->dev, "%s: activate tcq with queue depth %d\n",
			__func__, lun_qdepth);
	scsi_change_queue_depth(sdev, lun_qdepth);
}

/*
 * ufshcd_get_lu_wp - returns the "b_lu_write_protect" from UNIT DESCRIPTOR
 * @hba: per-adapter instance
 * @lun: UFS device lun id
 * @b_lu_write_protect: pointer to buffer to hold the LU's write protect info
 *
 * Returns 0 in case of success and b_lu_write_protect status would be returned
 * @b_lu_write_protect parameter.
 * Returns -ENOTSUPP if reading b_lu_write_protect is not supported.
 * Returns -EINVAL in case of invalid parameters passed to this function.
 */
static int ufshcd_get_lu_wp(struct ufs_hba *hba,
			    u8 lun,
			    u8 *b_lu_write_protect)
{
	int ret;

	if (!b_lu_write_protect)
		ret = -EINVAL;
	/*
	 * According to UFS device spec, RPMB LU can't be write
	 * protected so skip reading bLUWriteProtect parameter for
	 * it. For other W-LUs, UNIT DESCRIPTOR is not available.
	 */
	else if (lun >= UFS_UPIU_MAX_GENERAL_LUN)
		ret = -ENOTSUPP;
	else
		ret = ufshcd_read_unit_desc_param(hba,
					  lun,
					  UNIT_DESC_PARAM_LU_WR_PROTECT,
					  b_lu_write_protect,
					  sizeof(*b_lu_write_protect));
	return ret;
}

/**
 * ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
 * status
 * @hba: per-adapter instance
 * @sdev: pointer to SCSI device
 *
 */
static inline void ufshcd_get_lu_power_on_wp_status(struct ufs_hba *hba,
						    struct scsi_device *sdev)
{
	if (hba->dev_info.f_power_on_wp_en &&
	    !hba->dev_info.is_lu_power_on_wp) {
		u8 b_lu_write_protect;

		if (!ufshcd_get_lu_wp(hba, ufshcd_scsi_to_upiu_lun(sdev->lun),
				      &b_lu_write_protect) &&
		    (b_lu_write_protect == UFS_LU_POWER_ON_WP))
			hba->dev_info.is_lu_power_on_wp = true;
	}
}

/**
 * ufshcd_slave_alloc - handle initial SCSI device configurations
 * @sdev: pointer to SCSI device
 *
 * Returns success
 */
static int ufshcd_slave_alloc(struct scsi_device *sdev)
{
	struct ufs_hba *hba;

	hba = shost_priv(sdev->host);

	/* Mode sense(6) is not supported by UFS, so use Mode sense(10) */
	sdev->use_10_for_ms = 1;

	/* allow SCSI layer to restart the device in case of errors */
	sdev->allow_restart = 1;

	/* REPORT SUPPORTED OPERATION CODES is not supported */
	sdev->no_report_opcodes = 1;

	/* WRITE_SAME command is not supported */
	sdev->no_write_same = 1;

	ufshcd_set_queue_depth(sdev);

	ufshcd_get_lu_power_on_wp_status(hba, sdev);

	return 0;
}

/**
 * ufshcd_change_queue_depth - change queue depth
 * @sdev: pointer to SCSI device
 * @depth: required depth to set
 *
 * Change queue depth and make sure the max. limits are not crossed.
 */
static int ufshcd_change_queue_depth(struct scsi_device *sdev, int depth)
{
	struct ufs_hba *hba = shost_priv(sdev->host);

	if (depth > hba->nutrs)
		depth = hba->nutrs;
	return scsi_change_queue_depth(sdev, depth);
}

/**
 * ufshcd_slave_configure - adjust SCSI device configurations
 * @sdev: pointer to SCSI device
 */
static int ufshcd_slave_configure(struct scsi_device *sdev)
{
	struct request_queue *q = sdev->request_queue;

	blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
	return 0;
}

/**
 * ufshcd_slave_destroy - remove SCSI device configurations
 * @sdev: pointer to SCSI device
 */
static void ufshcd_slave_destroy(struct scsi_device *sdev)
{
	struct ufs_hba *hba;

	hba = shost_priv(sdev->host);
	/* Drop the reference as it won't be needed anymore */
	if (ufshcd_scsi_to_upiu_lun(sdev->lun) == UFS_UPIU_UFS_DEVICE_WLUN) {
		unsigned long flags;

		spin_lock_irqsave(hba->host->host_lock, flags);
		hba->sdev_ufs_device = NULL;
		spin_unlock_irqrestore(hba->host->host_lock, flags);
	}
}

/**
 * ufshcd_scsi_cmd_status - Update SCSI command result based on SCSI status
 * @lrbp: pointer to local reference block of completed command
 * @scsi_status: SCSI command status
 *
 * Returns value base on SCSI command status
 */
static inline int
ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status)
{
	int result = 0;

	switch (scsi_status) {
	case SAM_STAT_CHECK_CONDITION:
		ufshcd_copy_sense_data(lrbp);
		/* fallthrough */
	case SAM_STAT_GOOD:
		result |= DID_OK << 16 |
			  COMMAND_COMPLETE << 8 |
			  scsi_status;
		break;
	case SAM_STAT_TASK_SET_FULL:
	case SAM_STAT_BUSY:
	case SAM_STAT_TASK_ABORTED:
		ufshcd_copy_sense_data(lrbp);
		result |= scsi_status;
		break;
	default:
		result |= DID_ERROR << 16;
		break;
	} /* end of switch */

	return result;
}

/**
 * ufshcd_transfer_rsp_status - Get overall status of the response
 * @hba: per adapter instance
 * @lrbp: pointer to local reference block of completed command
 *
 * Returns result of the command to notify SCSI midlayer
 */
static inline int
ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
{
	int result = 0;
	int scsi_status;
	int ocs;

	/* overall command status of utrd */
	ocs = ufshcd_get_tr_ocs(lrbp);

	switch (ocs) {
	case OCS_SUCCESS:
		result = ufshcd_get_req_rsp(lrbp->ucd_rsp_ptr);
		hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);
		switch (result) {
		case UPIU_TRANSACTION_RESPONSE:
			/*
			 * get the response UPIU result to extract
			 * the SCSI command status
			 */
			result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr);

			/*
			 * get the result based on SCSI status response
			 * to notify the SCSI midlayer of the command status
			 */
			scsi_status = result & MASK_SCSI_STATUS;
			result = ufshcd_scsi_cmd_status(lrbp, scsi_status);

			/*
			 * Currently we are only supporting BKOPs exception
			 * events hence we can ignore BKOPs exception event
			 * during power management callbacks. BKOPs exception
			 * event is not expected to be raised in runtime suspend
			 * callback as it allows the urgent bkops.
			 * During system suspend, we are anyway forcefully
			 * disabling the bkops and if urgent bkops is needed
			 * it will be enabled on system resume. Long term
			 * solution could be to abort the system suspend if
			 * UFS device needs urgent BKOPs.
			 */
			if (!hba->pm_op_in_progress &&
			    ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
				schedule_work(&hba->eeh_work);
			break;
		case UPIU_TRANSACTION_REJECT_UPIU:
			/* TODO: handle Reject UPIU Response */
			result = DID_ERROR << 16;
			dev_err(hba->dev,
				"Reject UPIU not fully implemented\n");
			break;
		default:
			dev_err(hba->dev,
				"Unexpected request response code = %x\n",
				result);
			result = DID_ERROR << 16;
			break;
		}
		break;
	case OCS_ABORTED:
		result |= DID_ABORT << 16;
		break;
	case OCS_INVALID_COMMAND_STATUS:
		result |= DID_REQUEUE << 16;
		break;
	case OCS_INVALID_CMD_TABLE_ATTR:
	case OCS_INVALID_PRDT_ATTR:
	case OCS_MISMATCH_DATA_BUF_SIZE:
	case OCS_MISMATCH_RESP_UPIU_SIZE:
	case OCS_PEER_COMM_FAILURE:
	case OCS_FATAL_ERROR:
	default:
		result |= DID_ERROR << 16;
		dev_err(hba->dev,
				"OCS error from controller = %x for tag %d\n",
				ocs, lrbp->task_tag);
		ufshcd_print_host_regs(hba);
		ufshcd_print_host_state(hba);
		break;
	} /* end of switch */

	if (host_byte(result) != DID_OK)
		ufshcd_print_trs(hba, 1 << lrbp->task_tag, true);
	return result;
}

/**
 * ufshcd_uic_cmd_compl - handle completion of uic command
 * @hba: per adapter instance
 * @intr_status: interrupt status generated by the controller
 */
static void ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
{
	if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) {
		hba->active_uic_cmd->argument2 |=
			ufshcd_get_uic_cmd_result(hba);
		hba->active_uic_cmd->argument3 =
			ufshcd_get_dme_attr_val(hba);
		complete(&hba->active_uic_cmd->done);
	}

	if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done)
		complete(hba->uic_async_done);
}

/**
 * __ufshcd_transfer_req_compl - handle SCSI and query command completion
 * @hba: per adapter instance
 * @completed_reqs: requests to complete
 */
static void __ufshcd_transfer_req_compl(struct ufs_hba *hba,
					unsigned long completed_reqs)
{
	struct ufshcd_lrb *lrbp;
	struct scsi_cmnd *cmd;
	int result;
	int index;

	for_each_set_bit(index, &completed_reqs, hba->nutrs) {
		lrbp = &hba->lrb[index];
		cmd = lrbp->cmd;
		if (cmd) {
			ufshcd_add_command_trace(hba, index, "complete");
			result = ufshcd_transfer_rsp_status(hba, lrbp);
			scsi_dma_unmap(cmd);
			cmd->result = result;
			/* Mark completed command as NULL in LRB */
			lrbp->cmd = NULL;
			clear_bit_unlock(index, &hba->lrb_in_use);
			/* Do not touch lrbp after scsi done */
			cmd->scsi_done(cmd);
			__ufshcd_release(hba);
		} else if (lrbp->command_type == UTP_CMD_TYPE_DEV_MANAGE ||
			lrbp->command_type == UTP_CMD_TYPE_UFS_STORAGE) {
			if (hba->dev_cmd.complete) {
				ufshcd_add_command_trace(hba, index,
						"dev_complete");
				complete(hba->dev_cmd.complete);
			}
		}
		if (ufshcd_is_clkscaling_supported(hba))
			hba->clk_scaling.active_reqs--;

		lrbp->compl_time_stamp = ktime_get();
	}

	/* clear corresponding bits of completed commands */
	hba->outstanding_reqs ^= completed_reqs;

	ufshcd_clk_scaling_update_busy(hba);

	/* we might have free'd some tags above */
	wake_up(&hba->dev_cmd.tag_wq);
}

/**
 * ufshcd_transfer_req_compl - handle SCSI and query command completion
 * @hba: per adapter instance
 */
static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
{
	unsigned long completed_reqs;
	u32 tr_doorbell;

	/* Resetting interrupt aggregation counters first and reading the
	 * DOOR_BELL afterward allows us to handle all the completed requests.
	 * In order to prevent other interrupts starvation the DB is read once
	 * after reset. The down side of this solution is the possibility of
	 * false interrupt if device completes another request after resetting
	 * aggregation and before reading the DB.
	 */
	if (ufshcd_is_intr_aggr_allowed(hba) &&
	    !(hba->quirks & UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR))
		ufshcd_reset_intr_aggr(hba);

	tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	completed_reqs = tr_doorbell ^ hba->outstanding_reqs;

	__ufshcd_transfer_req_compl(hba, completed_reqs);
}

/**
 * ufshcd_disable_ee - disable exception event
 * @hba: per-adapter instance
 * @mask: exception event to disable
 *
 * Disables exception event in the device so that the EVENT_ALERT
 * bit is not set.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_disable_ee(struct ufs_hba *hba, u16 mask)
{
	int err = 0;
	u32 val;

	if (!(hba->ee_ctrl_mask & mask))
		goto out;

	val = hba->ee_ctrl_mask & ~mask;
	val &= MASK_EE_STATUS;
	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
			QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
	if (!err)
		hba->ee_ctrl_mask &= ~mask;
out:
	return err;
}

/**
 * ufshcd_enable_ee - enable exception event
 * @hba: per-adapter instance
 * @mask: exception event to enable
 *
 * Enable corresponding exception event in the device to allow
 * device to alert host in critical scenarios.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_enable_ee(struct ufs_hba *hba, u16 mask)
{
	int err = 0;
	u32 val;

	if (hba->ee_ctrl_mask & mask)
		goto out;

	val = hba->ee_ctrl_mask | mask;
	val &= MASK_EE_STATUS;
	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
			QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
	if (!err)
		hba->ee_ctrl_mask |= mask;
out:
	return err;
}

/**
 * ufshcd_enable_auto_bkops - Allow device managed BKOPS
 * @hba: per-adapter instance
 *
 * Allow device to manage background operations on its own. Enabling
 * this might lead to inconsistent latencies during normal data transfers
 * as the device is allowed to manage its own way of handling background
 * operations.
 *
 * Returns zero on success, non-zero on failure.
 */
static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
{
	int err = 0;

	if (hba->auto_bkops_enabled)
		goto out;

	err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
			QUERY_FLAG_IDN_BKOPS_EN, NULL);
	if (err) {
		dev_err(hba->dev, "%s: failed to enable bkops %d\n",
				__func__, err);
		goto out;
	}

	hba->auto_bkops_enabled = true;
	trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Enabled");

	/* No need of URGENT_BKOPS exception from the device */
	err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
	if (err)
		dev_err(hba->dev, "%s: failed to disable exception event %d\n",
				__func__, err);
out:
	return err;
}

/**
 * ufshcd_disable_auto_bkops - block device in doing background operations
 * @hba: per-adapter instance
 *
 * Disabling background operations improves command response latency but
 * has drawback of device moving into critical state where the device is
 * not-operable. Make sure to call ufshcd_enable_auto_bkops() whenever the
 * host is idle so that BKOPS are managed effectively without any negative
 * impacts.
 *
 * Returns zero on success, non-zero on failure.
 */
static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
{
	int err = 0;

	if (!hba->auto_bkops_enabled)
		goto out;

	/*
	 * If host assisted BKOPs is to be enabled, make sure
	 * urgent bkops exception is allowed.
	 */
	err = ufshcd_enable_ee(hba, MASK_EE_URGENT_BKOPS);
	if (err) {
		dev_err(hba->dev, "%s: failed to enable exception event %d\n",
				__func__, err);
		goto out;
	}

	err = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
			QUERY_FLAG_IDN_BKOPS_EN, NULL);
	if (err) {
		dev_err(hba->dev, "%s: failed to disable bkops %d\n",
				__func__, err);
		ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
		goto out;
	}

	hba->auto_bkops_enabled = false;
	trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Disabled");
out:
	return err;
}

/**
 * ufshcd_force_reset_auto_bkops - force reset auto bkops state
 * @hba: per adapter instance
 *
 * After a device reset the device may toggle the BKOPS_EN flag
 * to default value. The s/w tracking variables should be updated
 * as well. This function would change the auto-bkops state based on
 * UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND.
 */
static void ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
{
	if (ufshcd_keep_autobkops_enabled_except_suspend(hba)) {
		hba->auto_bkops_enabled = false;
		hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
		ufshcd_enable_auto_bkops(hba);
	} else {
		hba->auto_bkops_enabled = true;
		hba->ee_ctrl_mask &= ~MASK_EE_URGENT_BKOPS;
		ufshcd_disable_auto_bkops(hba);
	}
}

static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
{
	return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
			QUERY_ATTR_IDN_BKOPS_STATUS, 0, 0, status);
}

/**
 * ufshcd_bkops_ctrl - control the auto bkops based on current bkops status
 * @hba: per-adapter instance
 * @status: bkops_status value
 *
 * Read the bkops_status from the UFS device and Enable fBackgroundOpsEn
 * flag in the device to permit background operations if the device
 * bkops_status is greater than or equal to "status" argument passed to
 * this function, disable otherwise.
 *
 * Returns 0 for success, non-zero in case of failure.
 *
 * NOTE: Caller of this function can check the "hba->auto_bkops_enabled" flag
 * to know whether auto bkops is enabled or disabled after this function
 * returns control to it.
 */
static int ufshcd_bkops_ctrl(struct ufs_hba *hba,
			     enum bkops_status status)
{
	int err;
	u32 curr_status = 0;

	err = ufshcd_get_bkops_status(hba, &curr_status);
	if (err) {
		dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
				__func__, err);
		goto out;
	} else if (curr_status > BKOPS_STATUS_MAX) {
		dev_err(hba->dev, "%s: invalid BKOPS status %d\n",
				__func__, curr_status);
		err = -EINVAL;
		goto out;
	}

	if (curr_status >= status)
		err = ufshcd_enable_auto_bkops(hba);
	else
		err = ufshcd_disable_auto_bkops(hba);
out:
	return err;
}

/**
 * ufshcd_urgent_bkops - handle urgent bkops exception event
 * @hba: per-adapter instance
 *
 * Enable fBackgroundOpsEn flag in the device to permit background
 * operations.
 *
 * If BKOPs is enabled, this function returns 0, 1 if the bkops in not enabled
 * and negative error value for any other failure.
 */
static int ufshcd_urgent_bkops(struct ufs_hba *hba)
{
	return ufshcd_bkops_ctrl(hba, hba->urgent_bkops_lvl);
}

static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
{
	return ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
			QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
}

static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
{
	int err;
	u32 curr_status = 0;

	if (hba->is_urgent_bkops_lvl_checked)
		goto enable_auto_bkops;

	err = ufshcd_get_bkops_status(hba, &curr_status);
	if (err) {
		dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
				__func__, err);
		goto out;
	}

	/*
	 * We are seeing that some devices are raising the urgent bkops
	 * exception events even when BKOPS status doesn't indicate performace
	 * impacted or critical. Handle these device by determining their urgent
	 * bkops status at runtime.
	 */
	if (curr_status < BKOPS_STATUS_PERF_IMPACT) {
		dev_err(hba->dev, "%s: device raised urgent BKOPS exception for bkops status %d\n",
				__func__, curr_status);
		/* update the current status as the urgent bkops level */
		hba->urgent_bkops_lvl = curr_status;
		hba->is_urgent_bkops_lvl_checked = true;
	}

enable_auto_bkops:
	err = ufshcd_enable_auto_bkops(hba);
out:
	if (err < 0)
		dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
				__func__, err);
}

/**
 * ufshcd_exception_event_handler - handle exceptions raised by device
 * @work: pointer to work data
 *
 * Read bExceptionEventStatus attribute from the device and handle the
 * exception event accordingly.
 */
static void ufshcd_exception_event_handler(struct work_struct *work)
{
	struct ufs_hba *hba;
	int err;
	u32 status = 0;
	hba = container_of(work, struct ufs_hba, eeh_work);

	pm_runtime_get_sync(hba->dev);
	scsi_block_requests(hba->host);
	err = ufshcd_get_ee_status(hba, &status);
	if (err) {
		dev_err(hba->dev, "%s: failed to get exception status %d\n",
				__func__, err);
		goto out;
	}

	status &= hba->ee_ctrl_mask;

	if (status & MASK_EE_URGENT_BKOPS)
		ufshcd_bkops_exception_event_handler(hba);

out:
	scsi_unblock_requests(hba->host);
	pm_runtime_put_sync(hba->dev);
	return;
}

/* Complete requests that have door-bell cleared */
static void ufshcd_complete_requests(struct ufs_hba *hba)
{
	ufshcd_transfer_req_compl(hba);
	ufshcd_tmc_handler(hba);
}

/**
 * ufshcd_quirk_dl_nac_errors - This function checks if error handling is
 *				to recover from the DL NAC errors or not.
 * @hba: per-adapter instance
 *
 * Returns true if error handling is required, false otherwise
 */
static bool ufshcd_quirk_dl_nac_errors(struct ufs_hba *hba)
{
	unsigned long flags;
	bool err_handling = true;

	spin_lock_irqsave(hba->host->host_lock, flags);
	/*
	 * UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS only workaround the
	 * device fatal error and/or DL NAC & REPLAY timeout errors.
	 */
	if (hba->saved_err & (CONTROLLER_FATAL_ERROR | SYSTEM_BUS_FATAL_ERROR))
		goto out;

	if ((hba->saved_err & DEVICE_FATAL_ERROR) ||
	    ((hba->saved_err & UIC_ERROR) &&
	     (hba->saved_uic_err & UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))
		goto out;

	if ((hba->saved_err & UIC_ERROR) &&
	    (hba->saved_uic_err & UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)) {
		int err;
		/*
		 * wait for 50ms to see if we can get any other errors or not.
		 */
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		msleep(50);
		spin_lock_irqsave(hba->host->host_lock, flags);

		/*
		 * now check if we have got any other severe errors other than
		 * DL NAC error?
		 */
		if ((hba->saved_err & INT_FATAL_ERRORS) ||
		    ((hba->saved_err & UIC_ERROR) &&
		    (hba->saved_uic_err & ~UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)))
			goto out;

		/*
		 * As DL NAC is the only error received so far, send out NOP
		 * command to confirm if link is still active or not.
		 *   - If we don't get any response then do error recovery.
		 *   - If we get response then clear the DL NAC error bit.
		 */

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		err = ufshcd_verify_dev_init(hba);
		spin_lock_irqsave(hba->host->host_lock, flags);

		if (err)
			goto out;

		/* Link seems to be alive hence ignore the DL NAC errors */
		if (hba->saved_uic_err == UFSHCD_UIC_DL_NAC_RECEIVED_ERROR)
			hba->saved_err &= ~UIC_ERROR;
		/* clear NAC error */
		hba->saved_uic_err &= ~UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
		if (!hba->saved_uic_err) {
			err_handling = false;
			goto out;
		}
	}
out:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	return err_handling;
}

/**
 * ufshcd_err_handler - handle UFS errors that require s/w attention
 * @work: pointer to work structure
 */
static void ufshcd_err_handler(struct work_struct *work)
{
	struct ufs_hba *hba;
	unsigned long flags;
	u32 err_xfer = 0;
	u32 err_tm = 0;
	int err = 0;
	int tag;
	bool needs_reset = false;

	hba = container_of(work, struct ufs_hba, eh_work);

	pm_runtime_get_sync(hba->dev);
	ufshcd_hold(hba, false);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (hba->ufshcd_state == UFSHCD_STATE_RESET)
		goto out;

	hba->ufshcd_state = UFSHCD_STATE_RESET;
	ufshcd_set_eh_in_progress(hba);

	/* Complete requests that have door-bell cleared by h/w */
	ufshcd_complete_requests(hba);

	if (hba->dev_quirks & UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
		bool ret;

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		/* release the lock as ufshcd_quirk_dl_nac_errors() may sleep */
		ret = ufshcd_quirk_dl_nac_errors(hba);
		spin_lock_irqsave(hba->host->host_lock, flags);
		if (!ret)
			goto skip_err_handling;
	}
	if ((hba->saved_err & INT_FATAL_ERRORS) ||
	    (hba->saved_err & UFSHCD_UIC_HIBERN8_MASK) ||
	    ((hba->saved_err & UIC_ERROR) &&
	    (hba->saved_uic_err & (UFSHCD_UIC_DL_PA_INIT_ERROR |
				   UFSHCD_UIC_DL_NAC_RECEIVED_ERROR |
				   UFSHCD_UIC_DL_TCx_REPLAY_ERROR))))
		needs_reset = true;

	/*
	 * if host reset is required then skip clearing the pending
	 * transfers forcefully because they will automatically get
	 * cleared after link startup.
	 */
	if (needs_reset)
		goto skip_pending_xfer_clear;

	/* release lock as clear command might sleep */
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	/* Clear pending transfer requests */
	for_each_set_bit(tag, &hba->outstanding_reqs, hba->nutrs) {
		if (ufshcd_clear_cmd(hba, tag)) {
			err_xfer = true;
			goto lock_skip_pending_xfer_clear;
		}
	}

	/* Clear pending task management requests */
	for_each_set_bit(tag, &hba->outstanding_tasks, hba->nutmrs) {
		if (ufshcd_clear_tm_cmd(hba, tag)) {
			err_tm = true;
			goto lock_skip_pending_xfer_clear;
		}
	}

lock_skip_pending_xfer_clear:
	spin_lock_irqsave(hba->host->host_lock, flags);

	/* Complete the requests that are cleared by s/w */
	ufshcd_complete_requests(hba);

	if (err_xfer || err_tm)
		needs_reset = true;

skip_pending_xfer_clear:
	/* Fatal errors need reset */
	if (needs_reset) {
		unsigned long max_doorbells = (1UL << hba->nutrs) - 1;

		/*
		 * ufshcd_reset_and_restore() does the link reinitialization
		 * which will need atleast one empty doorbell slot to send the
		 * device management commands (NOP and query commands).
		 * If there is no slot empty at this moment then free up last
		 * slot forcefully.
		 */
		if (hba->outstanding_reqs == max_doorbells)
			__ufshcd_transfer_req_compl(hba,
						    (1UL << (hba->nutrs - 1)));

		spin_unlock_irqrestore(hba->host->host_lock, flags);
		err = ufshcd_reset_and_restore(hba);
		spin_lock_irqsave(hba->host->host_lock, flags);
		if (err) {
			dev_err(hba->dev, "%s: reset and restore failed\n",
					__func__);
			hba->ufshcd_state = UFSHCD_STATE_ERROR;
		}
		/*
		 * Inform scsi mid-layer that we did reset and allow to handle
		 * Unit Attention properly.
		 */
		scsi_report_bus_reset(hba->host, 0);
		hba->saved_err = 0;
		hba->saved_uic_err = 0;
	}

skip_err_handling:
	if (!needs_reset) {
		hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
		if (hba->saved_err || hba->saved_uic_err)
			dev_err_ratelimited(hba->dev, "%s: exit: saved_err 0x%x saved_uic_err 0x%x",
			    __func__, hba->saved_err, hba->saved_uic_err);
	}

	ufshcd_clear_eh_in_progress(hba);

out:
	spin_unlock_irqrestore(hba->host->host_lock, flags);
	ufshcd_scsi_unblock_requests(hba);
	ufshcd_release(hba);
	pm_runtime_put_sync(hba->dev);
}

static void ufshcd_update_uic_reg_hist(struct ufs_uic_err_reg_hist *reg_hist,
		u32 reg)
{
	reg_hist->reg[reg_hist->pos] = reg;
	reg_hist->tstamp[reg_hist->pos] = ktime_get();
	reg_hist->pos = (reg_hist->pos + 1) % UIC_ERR_REG_HIST_LENGTH;
}

/**
 * ufshcd_update_uic_error - check and set fatal UIC error flags.
 * @hba: per-adapter instance
 */
static void ufshcd_update_uic_error(struct ufs_hba *hba)
{
	u32 reg;

	/* PHY layer lane error */
	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
	/* Ignore LINERESET indication, as this is not an error */
	if ((reg & UIC_PHY_ADAPTER_LAYER_ERROR) &&
			(reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)) {
		/*
		 * To know whether this error is fatal or not, DB timeout
		 * must be checked but this error is handled separately.
		 */
		dev_dbg(hba->dev, "%s: UIC Lane error reported\n", __func__);
		ufshcd_update_uic_reg_hist(&hba->ufs_stats.pa_err, reg);
	}

	/* PA_INIT_ERROR is fatal and needs UIC reset */
	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
	if (reg)
		ufshcd_update_uic_reg_hist(&hba->ufs_stats.dl_err, reg);

	if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
		hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;
	else if (hba->dev_quirks &
		   UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
		if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED)
			hba->uic_error |=
				UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
		else if (reg & UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT)
			hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR;
	}

	/* UIC NL/TL/DME errors needs software retry */
	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER);
	if (reg) {
		ufshcd_update_uic_reg_hist(&hba->ufs_stats.nl_err, reg);
		hba->uic_error |= UFSHCD_UIC_NL_ERROR;
	}

	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER);
	if (reg) {
		ufshcd_update_uic_reg_hist(&hba->ufs_stats.tl_err, reg);
		hba->uic_error |= UFSHCD_UIC_TL_ERROR;
	}

	reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME);
	if (reg) {
		ufshcd_update_uic_reg_hist(&hba->ufs_stats.dme_err, reg);
		hba->uic_error |= UFSHCD_UIC_DME_ERROR;
	}

	dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n",
			__func__, hba->uic_error);
}

static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba,
					 u32 intr_mask)
{
	if (!ufshcd_is_auto_hibern8_supported(hba))
		return false;

	if (!(intr_mask & UFSHCD_UIC_HIBERN8_MASK))
		return false;

	if (hba->active_uic_cmd &&
	    (hba->active_uic_cmd->command == UIC_CMD_DME_HIBER_ENTER ||
	    hba->active_uic_cmd->command == UIC_CMD_DME_HIBER_EXIT))
		return false;

	return true;
}

/**
 * ufshcd_check_errors - Check for errors that need s/w attention
 * @hba: per-adapter instance
 */
static void ufshcd_check_errors(struct ufs_hba *hba)
{
	bool queue_eh_work = false;

	if (hba->errors & INT_FATAL_ERRORS)
		queue_eh_work = true;

	if (hba->errors & UIC_ERROR) {
		hba->uic_error = 0;
		ufshcd_update_uic_error(hba);
		if (hba->uic_error)
			queue_eh_work = true;
	}

	if (hba->errors & UFSHCD_UIC_HIBERN8_MASK) {
		dev_err(hba->dev,
			"%s: Auto Hibern8 %s failed - status: 0x%08x, upmcrs: 0x%08x\n",
			__func__, (hba->errors & UIC_HIBERNATE_ENTER) ?
			"Enter" : "Exit",
			hba->errors, ufshcd_get_upmcrs(hba));
		queue_eh_work = true;
	}

	if (queue_eh_work) {
		/*
		 * update the transfer error masks to sticky bits, let's do this
		 * irrespective of current ufshcd_state.
		 */
		hba->saved_err |= hba->errors;
		hba->saved_uic_err |= hba->uic_error;

		/* handle fatal errors only when link is functional */
		if (hba->ufshcd_state == UFSHCD_STATE_OPERATIONAL) {
			/* block commands from scsi mid-layer */
			ufshcd_scsi_block_requests(hba);

			hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED;

			/* dump controller state before resetting */
			if (hba->saved_err & (INT_FATAL_ERRORS | UIC_ERROR)) {
				bool pr_prdt = !!(hba->saved_err &
						SYSTEM_BUS_FATAL_ERROR);

				dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n",
					__func__, hba->saved_err,
					hba->saved_uic_err);

				ufshcd_print_host_regs(hba);
				ufshcd_print_pwr_info(hba);
				ufshcd_print_tmrs(hba, hba->outstanding_tasks);
				ufshcd_print_trs(hba, hba->outstanding_reqs,
							pr_prdt);
			}
			schedule_work(&hba->eh_work);
		}
	}
	/*
	 * if (!queue_eh_work) -
	 * Other errors are either non-fatal where host recovers
	 * itself without s/w intervention or errors that will be
	 * handled by the SCSI core layer.
	 */
}

/**
 * ufshcd_tmc_handler - handle task management function completion
 * @hba: per adapter instance
 */
static void ufshcd_tmc_handler(struct ufs_hba *hba)
{
	u32 tm_doorbell;

	tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
	hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks;
	wake_up(&hba->tm_wq);
}

/**
 * ufshcd_sl_intr - Interrupt service routine
 * @hba: per adapter instance
 * @intr_status: contains interrupts generated by the controller
 */
static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
{
	hba->errors = UFSHCD_ERROR_MASK & intr_status;

	if (ufshcd_is_auto_hibern8_error(hba, intr_status))
		hba->errors |= (UFSHCD_UIC_HIBERN8_MASK & intr_status);

	if (hba->errors)
		ufshcd_check_errors(hba);

	if (intr_status & UFSHCD_UIC_MASK)
		ufshcd_uic_cmd_compl(hba, intr_status);

	if (intr_status & UTP_TASK_REQ_COMPL)
		ufshcd_tmc_handler(hba);

	if (intr_status & UTP_TRANSFER_REQ_COMPL)
		ufshcd_transfer_req_compl(hba);
}

/**
 * ufshcd_intr - Main interrupt service routine
 * @irq: irq number
 * @__hba: pointer to adapter instance
 *
 * Returns IRQ_HANDLED - If interrupt is valid
 *		IRQ_NONE - If invalid interrupt
 */
static irqreturn_t ufshcd_intr(int irq, void *__hba)
{
	u32 intr_status, enabled_intr_status;
	irqreturn_t retval = IRQ_NONE;
	struct ufs_hba *hba = __hba;
	int retries = hba->nutrs;

	spin_lock(hba->host->host_lock);
	intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);

	/*
	 * There could be max of hba->nutrs reqs in flight and in worst case
	 * if the reqs get finished 1 by 1 after the interrupt status is
	 * read, make sure we handle them by checking the interrupt status
	 * again in a loop until we process all of the reqs before returning.
	 */
	do {
		enabled_intr_status =
			intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
		if (intr_status)
			ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
		if (enabled_intr_status) {
			ufshcd_sl_intr(hba, enabled_intr_status);
			retval = IRQ_HANDLED;
		}

		intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
	} while (intr_status && --retries);

	spin_unlock(hba->host->host_lock);
	return retval;
}

static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag)
{
	int err = 0;
	u32 mask = 1 << tag;
	unsigned long flags;

	if (!test_bit(tag, &hba->outstanding_tasks))
		goto out;

	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_utmrl_clear(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* poll for max. 1 sec to clear door bell register by h/w */
	err = ufshcd_wait_for_register(hba,
			REG_UTP_TASK_REQ_DOOR_BELL,
			mask, 0, 1000, 1000, true);
out:
	return err;
}

static int __ufshcd_issue_tm_cmd(struct ufs_hba *hba,
		struct utp_task_req_desc *treq, u8 tm_function)
{
	struct Scsi_Host *host = hba->host;
	unsigned long flags;
	int free_slot, task_tag, err;

	/*
	 * Get free slot, sleep if slots are unavailable.
	 * Even though we use wait_event() which sleeps indefinitely,
	 * the maximum wait time is bounded by %TM_CMD_TIMEOUT.
	 */
	wait_event(hba->tm_tag_wq, ufshcd_get_tm_free_slot(hba, &free_slot));
	ufshcd_hold(hba, false);

	spin_lock_irqsave(host->host_lock, flags);
	task_tag = hba->nutrs + free_slot;

	treq->req_header.dword_0 |= cpu_to_be32(task_tag);

	memcpy(hba->utmrdl_base_addr + free_slot, treq, sizeof(*treq));
	ufshcd_vops_setup_task_mgmt(hba, free_slot, tm_function);

	/* send command to the controller */
	__set_bit(free_slot, &hba->outstanding_tasks);

	/* Make sure descriptors are ready before ringing the task doorbell */
	wmb();

	ufshcd_writel(hba, 1 << free_slot, REG_UTP_TASK_REQ_DOOR_BELL);
	/* Make sure that doorbell is committed immediately */
	wmb();

	spin_unlock_irqrestore(host->host_lock, flags);

	ufshcd_add_tm_upiu_trace(hba, task_tag, "tm_send");

	/* wait until the task management command is completed */
	err = wait_event_timeout(hba->tm_wq,
			test_bit(free_slot, &hba->tm_condition),
			msecs_to_jiffies(TM_CMD_TIMEOUT));
	if (!err) {
		ufshcd_add_tm_upiu_trace(hba, task_tag, "tm_complete_err");
		dev_err(hba->dev, "%s: task management cmd 0x%.2x timed-out\n",
				__func__, tm_function);
		if (ufshcd_clear_tm_cmd(hba, free_slot))
			dev_WARN(hba->dev, "%s: unable clear tm cmd (slot %d) after timeout\n",
					__func__, free_slot);
		err = -ETIMEDOUT;
	} else {
		err = 0;
		memcpy(treq, hba->utmrdl_base_addr + free_slot, sizeof(*treq));

		ufshcd_add_tm_upiu_trace(hba, task_tag, "tm_complete");

		spin_lock_irqsave(hba->host->host_lock, flags);
		__clear_bit(free_slot, &hba->outstanding_tasks);
		spin_unlock_irqrestore(hba->host->host_lock, flags);

	}

	clear_bit(free_slot, &hba->tm_condition);
	ufshcd_put_tm_slot(hba, free_slot);
	wake_up(&hba->tm_tag_wq);

	ufshcd_release(hba);
	return err;
}

/**
 * ufshcd_issue_tm_cmd - issues task management commands to controller
 * @hba: per adapter instance
 * @lun_id: LUN ID to which TM command is sent
 * @task_id: task ID to which the TM command is applicable
 * @tm_function: task management function opcode
 * @tm_response: task management service response return value
 *
 * Returns non-zero value on error, zero on success.
 */
static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, int lun_id, int task_id,
		u8 tm_function, u8 *tm_response)
{
	struct utp_task_req_desc treq = { { 0 }, };
	int ocs_value, err;

	/* Configure task request descriptor */
	treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
	treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS);

	/* Configure task request UPIU */
	treq.req_header.dword_0 = cpu_to_be32(lun_id << 8) |
				  cpu_to_be32(UPIU_TRANSACTION_TASK_REQ << 24);
	treq.req_header.dword_1 = cpu_to_be32(tm_function << 16);

	/*
	 * The host shall provide the same value for LUN field in the basic
	 * header and for Input Parameter.
	 */
	treq.input_param1 = cpu_to_be32(lun_id);
	treq.input_param2 = cpu_to_be32(task_id);

	err = __ufshcd_issue_tm_cmd(hba, &treq, tm_function);
	if (err == -ETIMEDOUT)
		return err;

	ocs_value = le32_to_cpu(treq.header.dword_2) & MASK_OCS;
	if (ocs_value != OCS_SUCCESS)
		dev_err(hba->dev, "%s: failed, ocs = 0x%x\n",
				__func__, ocs_value);
	else if (tm_response)
		*tm_response = be32_to_cpu(treq.output_param1) &
				MASK_TM_SERVICE_RESP;
	return err;
}

/**
 * ufshcd_issue_devman_upiu_cmd - API for sending "utrd" type requests
 * @hba:	per-adapter instance
 * @req_upiu:	upiu request
 * @rsp_upiu:	upiu reply
 * @msgcode:	message code, one of UPIU Transaction Codes Initiator to Target
 * @desc_buff:	pointer to descriptor buffer, NULL if NA
 * @buff_len:	descriptor size, 0 if NA
 * @desc_op:	descriptor operation
 *
 * Those type of requests uses UTP Transfer Request Descriptor - utrd.
 * Therefore, it "rides" the device management infrastructure: uses its tag and
 * tasks work queues.
 *
 * Since there is only one available tag for device management commands,
 * the caller is expected to hold the hba->dev_cmd.lock mutex.
 */
static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
					struct utp_upiu_req *req_upiu,
					struct utp_upiu_req *rsp_upiu,
					u8 *desc_buff, int *buff_len,
					int cmd_type,
					enum query_opcode desc_op)
{
	struct ufshcd_lrb *lrbp;
	int err = 0;
	int tag;
	struct completion wait;
	unsigned long flags;
	u32 upiu_flags;

	down_read(&hba->clk_scaling_lock);

	wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag));

	init_completion(&wait);
	lrbp = &hba->lrb[tag];
	WARN_ON(lrbp->cmd);

	lrbp->cmd = NULL;
	lrbp->sense_bufflen = 0;
	lrbp->sense_buffer = NULL;
	lrbp->task_tag = tag;
	lrbp->lun = 0;
	lrbp->intr_cmd = true;
	hba->dev_cmd.type = cmd_type;

	switch (hba->ufs_version) {
	case UFSHCI_VERSION_10:
	case UFSHCI_VERSION_11:
		lrbp->command_type = UTP_CMD_TYPE_DEV_MANAGE;
		break;
	default:
		lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
		break;
	}

	/* update the task tag in the request upiu */
	req_upiu->header.dword_0 |= cpu_to_be32(tag);

	ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);

	/* just copy the upiu request as it is */
	memcpy(lrbp->ucd_req_ptr, req_upiu, sizeof(*lrbp->ucd_req_ptr));
	if (desc_buff && desc_op == UPIU_QUERY_OPCODE_WRITE_DESC) {
		/* The Data Segment Area is optional depending upon the query
		 * function value. for WRITE DESCRIPTOR, the data segment
		 * follows right after the tsf.
		 */
		memcpy(lrbp->ucd_req_ptr + 1, desc_buff, *buff_len);
		*buff_len = 0;
	}

	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));

	hba->dev_cmd.complete = &wait;

	/* Make sure descriptors are ready before ringing the doorbell */
	wmb();
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_send_command(hba, tag);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/*
	 * ignore the returning value here - ufshcd_check_query_response is
	 * bound to fail since dev_cmd.query and dev_cmd.type were left empty.
	 * read the response directly ignoring all errors.
	 */
	ufshcd_wait_for_dev_cmd(hba, lrbp, QUERY_REQ_TIMEOUT);

	/* just copy the upiu response as it is */
	memcpy(rsp_upiu, lrbp->ucd_rsp_ptr, sizeof(*rsp_upiu));
	if (desc_buff && desc_op == UPIU_QUERY_OPCODE_READ_DESC) {
		u8 *descp = (u8 *)lrbp->ucd_rsp_ptr + sizeof(*rsp_upiu);
		u16 resp_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2) &
			       MASK_QUERY_DATA_SEG_LEN;

		if (*buff_len >= resp_len) {
			memcpy(desc_buff, descp, resp_len);
			*buff_len = resp_len;
		} else {
			dev_warn(hba->dev, "rsp size is bigger than buffer");
			*buff_len = 0;
			err = -EINVAL;
		}
	}

	ufshcd_put_dev_cmd_tag(hba, tag);
	wake_up(&hba->dev_cmd.tag_wq);
	up_read(&hba->clk_scaling_lock);
	return err;
}

/**
 * ufshcd_exec_raw_upiu_cmd - API function for sending raw upiu commands
 * @hba:	per-adapter instance
 * @req_upiu:	upiu request
 * @rsp_upiu:	upiu reply - only 8 DW as we do not support scsi commands
 * @msgcode:	message code, one of UPIU Transaction Codes Initiator to Target
 * @desc_buff:	pointer to descriptor buffer, NULL if NA
 * @buff_len:	descriptor size, 0 if NA
 * @desc_op:	descriptor operation
 *
 * Supports UTP Transfer requests (nop and query), and UTP Task
 * Management requests.
 * It is up to the caller to fill the upiu conent properly, as it will
 * be copied without any further input validations.
 */
int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
			     struct utp_upiu_req *req_upiu,
			     struct utp_upiu_req *rsp_upiu,
			     int msgcode,
			     u8 *desc_buff, int *buff_len,
			     enum query_opcode desc_op)
{
	int err;
	int cmd_type = DEV_CMD_TYPE_QUERY;
	struct utp_task_req_desc treq = { { 0 }, };
	int ocs_value;
	u8 tm_f = be32_to_cpu(req_upiu->header.dword_1) >> 16 & MASK_TM_FUNC;

	switch (msgcode) {
	case UPIU_TRANSACTION_NOP_OUT:
		cmd_type = DEV_CMD_TYPE_NOP;
		/* fall through */
	case UPIU_TRANSACTION_QUERY_REQ:
		ufshcd_hold(hba, false);
		mutex_lock(&hba->dev_cmd.lock);
		err = ufshcd_issue_devman_upiu_cmd(hba, req_upiu, rsp_upiu,
						   desc_buff, buff_len,
						   cmd_type, desc_op);
		mutex_unlock(&hba->dev_cmd.lock);
		ufshcd_release(hba);

		break;
	case UPIU_TRANSACTION_TASK_REQ:
		treq.header.dword_0 = cpu_to_le32(UTP_REQ_DESC_INT_CMD);
		treq.header.dword_2 = cpu_to_le32(OCS_INVALID_COMMAND_STATUS);

		memcpy(&treq.req_header, req_upiu, sizeof(*req_upiu));

		err = __ufshcd_issue_tm_cmd(hba, &treq, tm_f);
		if (err == -ETIMEDOUT)
			break;

		ocs_value = le32_to_cpu(treq.header.dword_2) & MASK_OCS;
		if (ocs_value != OCS_SUCCESS) {
			dev_err(hba->dev, "%s: failed, ocs = 0x%x\n", __func__,
				ocs_value);
			break;
		}

		memcpy(rsp_upiu, &treq.rsp_header, sizeof(*rsp_upiu));

		break;
	default:
		err = -EINVAL;

		break;
	}

	return err;
}

/**
 * ufshcd_eh_device_reset_handler - device reset handler registered to
 *                                    scsi layer.
 * @cmd: SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
	struct Scsi_Host *host;
	struct ufs_hba *hba;
	unsigned int tag;
	u32 pos;
	int err;
	u8 resp = 0xF;
	struct ufshcd_lrb *lrbp;
	unsigned long flags;

	host = cmd->device->host;
	hba = shost_priv(host);
	tag = cmd->request->tag;

	lrbp = &hba->lrb[tag];
	err = ufshcd_issue_tm_cmd(hba, lrbp->lun, 0, UFS_LOGICAL_RESET, &resp);
	if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
		if (!err)
			err = resp;
		goto out;
	}

	/* clear the commands that were pending for corresponding LUN */
	for_each_set_bit(pos, &hba->outstanding_reqs, hba->nutrs) {
		if (hba->lrb[pos].lun == lrbp->lun) {
			err = ufshcd_clear_cmd(hba, pos);
			if (err)
				break;
		}
	}
	spin_lock_irqsave(host->host_lock, flags);
	ufshcd_transfer_req_compl(hba);
	spin_unlock_irqrestore(host->host_lock, flags);

out:
	hba->req_abort_count = 0;
	if (!err) {
		err = SUCCESS;
	} else {
		dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
		err = FAILED;
	}
	return err;
}

static void ufshcd_set_req_abort_skip(struct ufs_hba *hba, unsigned long bitmap)
{
	struct ufshcd_lrb *lrbp;
	int tag;

	for_each_set_bit(tag, &bitmap, hba->nutrs) {
		lrbp = &hba->lrb[tag];
		lrbp->req_abort_skip = true;
	}
}

/**
 * ufshcd_abort - abort a specific command
 * @cmd: SCSI command pointer
 *
 * Abort the pending command in device by sending UFS_ABORT_TASK task management
 * command, and in host controller by clearing the door-bell register. There can
 * be race between controller sending the command to the device while abort is
 * issued. To avoid that, first issue UFS_QUERY_TASK to check if the command is
 * really issued and then try to abort it.
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_abort(struct scsi_cmnd *cmd)
{
	struct Scsi_Host *host;
	struct ufs_hba *hba;
	unsigned long flags;
	unsigned int tag;
	int err = 0;
	int poll_cnt;
	u8 resp = 0xF;
	struct ufshcd_lrb *lrbp;
	u32 reg;

	host = cmd->device->host;
	hba = shost_priv(host);
	tag = cmd->request->tag;
	lrbp = &hba->lrb[tag];
	if (!ufshcd_valid_tag(hba, tag)) {
		dev_err(hba->dev,
			"%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p",
			__func__, tag, cmd, cmd->request);
		BUG();
	}

	/*
	 * Task abort to the device W-LUN is illegal. When this command
	 * will fail, due to spec violation, scsi err handling next step
	 * will be to send LU reset which, again, is a spec violation.
	 * To avoid these unnecessary/illegal step we skip to the last error
	 * handling stage: reset and restore.
	 */
	if (lrbp->lun == UFS_UPIU_UFS_DEVICE_WLUN)
		return ufshcd_eh_host_reset_handler(cmd);

	ufshcd_hold(hba, false);
	reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
	/* If command is already aborted/completed, return SUCCESS */
	if (!(test_bit(tag, &hba->outstanding_reqs))) {
		dev_err(hba->dev,
			"%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
			__func__, tag, hba->outstanding_reqs, reg);
		goto out;
	}

	if (!(reg & (1 << tag))) {
		dev_err(hba->dev,
		"%s: cmd was completed, but without a notifying intr, tag = %d",
		__func__, tag);
	}

	/* Print Transfer Request of aborted task */
	dev_err(hba->dev, "%s: Device abort task at tag %d\n", __func__, tag);

	/*
	 * Print detailed info about aborted request.
	 * As more than one request might get aborted at the same time,
	 * print full information only for the first aborted request in order
	 * to reduce repeated printouts. For other aborted requests only print
	 * basic details.
	 */
	scsi_print_command(hba->lrb[tag].cmd);
	if (!hba->req_abort_count) {
		ufshcd_print_host_regs(hba);
		ufshcd_print_host_state(hba);
		ufshcd_print_pwr_info(hba);
		ufshcd_print_trs(hba, 1 << tag, true);
	} else {
		ufshcd_print_trs(hba, 1 << tag, false);
	}
	hba->req_abort_count++;

	/* Skip task abort in case previous aborts failed and report failure */
	if (lrbp->req_abort_skip) {
		err = -EIO;
		goto out;
	}

	for (poll_cnt = 100; poll_cnt; poll_cnt--) {
		err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
				UFS_QUERY_TASK, &resp);
		if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED) {
			/* cmd pending in the device */
			dev_err(hba->dev, "%s: cmd pending in the device. tag = %d\n",
				__func__, tag);
			break;
		} else if (!err && resp == UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
			/*
			 * cmd not pending in the device, check if it is
			 * in transition.
			 */
			dev_err(hba->dev, "%s: cmd at tag %d not pending in the device.\n",
				__func__, tag);
			reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
			if (reg & (1 << tag)) {
				/* sleep for max. 200us to stabilize */
				usleep_range(100, 200);
				continue;
			}
			/* command completed already */
			dev_err(hba->dev, "%s: cmd at tag %d successfully cleared from DB.\n",
				__func__, tag);
			goto out;
		} else {
			dev_err(hba->dev,
				"%s: no response from device. tag = %d, err %d\n",
				__func__, tag, err);
			if (!err)
				err = resp; /* service response error */
			goto out;
		}
	}

	if (!poll_cnt) {
		err = -EBUSY;
		goto out;
	}

	err = ufshcd_issue_tm_cmd(hba, lrbp->lun, lrbp->task_tag,
			UFS_ABORT_TASK, &resp);
	if (err || resp != UPIU_TASK_MANAGEMENT_FUNC_COMPL) {
		if (!err) {
			err = resp; /* service response error */
			dev_err(hba->dev, "%s: issued. tag = %d, err %d\n",
				__func__, tag, err);
		}
		goto out;
	}

	err = ufshcd_clear_cmd(hba, tag);
	if (err) {
		dev_err(hba->dev, "%s: Failed clearing cmd at tag %d, err %d\n",
			__func__, tag, err);
		goto out;
	}

	scsi_dma_unmap(cmd);

	spin_lock_irqsave(host->host_lock, flags);
	ufshcd_outstanding_req_clear(hba, tag);
	hba->lrb[tag].cmd = NULL;
	spin_unlock_irqrestore(host->host_lock, flags);

	clear_bit_unlock(tag, &hba->lrb_in_use);
	wake_up(&hba->dev_cmd.tag_wq);

out:
	if (!err) {
		err = SUCCESS;
	} else {
		dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
		ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
		err = FAILED;
	}

	/*
	 * This ufshcd_release() corresponds to the original scsi cmd that got
	 * aborted here (as we won't get any IRQ for it).
	 */
	ufshcd_release(hba);
	return err;
}

/**
 * ufshcd_host_reset_and_restore - reset and restore host controller
 * @hba: per-adapter instance
 *
 * Note that host controller reset may issue DME_RESET to
 * local and remote (device) Uni-Pro stack and the attributes
 * are reset to default state.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
{
	int err;
	unsigned long flags;

	/* Reset the host controller */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_hba_stop(hba, false);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	/* scale up clocks to max frequency before full reinitialization */
	ufshcd_scale_clks(hba, true);

	err = ufshcd_hba_enable(hba);
	if (err)
		goto out;

	/* Establish the link again and restore the device */
	err = ufshcd_probe_hba(hba);

	if (!err && (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL))
		err = -EIO;
out:
	if (err)
		dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err);

	return err;
}

/**
 * ufshcd_reset_and_restore - reset and re-initialize host/device
 * @hba: per-adapter instance
 *
 * Reset and recover device, host and re-establish link. This
 * is helpful to recover the communication in fatal error conditions.
 *
 * Returns zero on success, non-zero on failure
 */
static int ufshcd_reset_and_restore(struct ufs_hba *hba)
{
	int err = 0;
	unsigned long flags;
	int retries = MAX_HOST_RESET_RETRIES;

	do {
		err = ufshcd_host_reset_and_restore(hba);
	} while (err && --retries);

	/*
	 * After reset the door-bell might be cleared, complete
	 * outstanding requests in s/w here.
	 */
	spin_lock_irqsave(hba->host->host_lock, flags);
	ufshcd_transfer_req_compl(hba);
	ufshcd_tmc_handler(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return err;
}

/**
 * ufshcd_eh_host_reset_handler - host reset handler registered to scsi layer
 * @cmd: SCSI command pointer
 *
 * Returns SUCCESS/FAILED
 */
static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd)
{
	int err;
	unsigned long flags;
	struct ufs_hba *hba;

	hba = shost_priv(cmd->device->host);

	ufshcd_hold(hba, false);
	/*
	 * Check if there is any race with fatal error handling.
	 * If so, wait for it to complete. Even though fatal error
	 * handling does reset and restore in some cases, don't assume
	 * anything out of it. We are just avoiding race here.
	 */
	do {
		spin_lock_irqsave(hba->host->host_lock, flags);
		if (!(work_pending(&hba->eh_work) ||
			    hba->ufshcd_state == UFSHCD_STATE_RESET ||
			    hba->ufshcd_state == UFSHCD_STATE_EH_SCHEDULED))
			break;
		spin_unlock_irqrestore(hba->host->host_lock, flags);
		dev_dbg(hba->dev, "%s: reset in progress\n", __func__);
		flush_work(&hba->eh_work);
	} while (1);

	hba->ufshcd_state = UFSHCD_STATE_RESET;
	ufshcd_set_eh_in_progress(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	err = ufshcd_reset_and_restore(hba);

	spin_lock_irqsave(hba->host->host_lock, flags);
	if (!err) {
		err = SUCCESS;
		hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
	} else {
		err = FAILED;
		hba->ufshcd_state = UFSHCD_STATE_ERROR;
	}
	ufshcd_clear_eh_in_progress(hba);
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	ufshcd_release(hba);
	return err;
}

/**
 * ufshcd_get_max_icc_level - calculate the ICC level
 * @sup_curr_uA: max. current supported by the regulator
 * @start_scan: row at the desc table to start scan from
 * @buff: power descriptor buffer
 *
 * Returns calculated max ICC level for specific regulator
 */
static u32 ufshcd_get_max_icc_level(int sup_curr_uA, u32 start_scan, char *buff)
{
	int i;
	int curr_uA;
	u16 data;
	u16 unit;

	for (i = start_scan; i >= 0; i--) {
		data = be16_to_cpup((__be16 *)&buff[2 * i]);
		unit = (data & ATTR_ICC_LVL_UNIT_MASK) >>
						ATTR_ICC_LVL_UNIT_OFFSET;
		curr_uA = data & ATTR_ICC_LVL_VALUE_MASK;
		switch (unit) {
		case UFSHCD_NANO_AMP:
			curr_uA = curr_uA / 1000;
			break;
		case UFSHCD_MILI_AMP:
			curr_uA = curr_uA * 1000;
			break;
		case UFSHCD_AMP:
			curr_uA = curr_uA * 1000 * 1000;
			break;
		case UFSHCD_MICRO_AMP:
		default:
			break;
		}
		if (sup_curr_uA >= curr_uA)
			break;
	}
	if (i < 0) {
		i = 0;
		pr_err("%s: Couldn't find valid icc_level = %d", __func__, i);
	}

	return (u32)i;
}

/**
 * ufshcd_calc_icc_level - calculate the max ICC level
 * In case regulators are not initialized we'll return 0
 * @hba: per-adapter instance
 * @desc_buf: power descriptor buffer to extract ICC levels from.
 * @len: length of desc_buff
 *
 * Returns calculated ICC level
 */
static u32 ufshcd_find_max_sup_active_icc_level(struct ufs_hba *hba,
							u8 *desc_buf, int len)
{
	u32 icc_level = 0;

	if (!hba->vreg_info.vcc || !hba->vreg_info.vccq ||
						!hba->vreg_info.vccq2) {
		dev_err(hba->dev,
			"%s: Regulator capability was not set, actvIccLevel=%d",
							__func__, icc_level);
		goto out;
	}

	if (hba->vreg_info.vcc && hba->vreg_info.vcc->max_uA)
		icc_level = ufshcd_get_max_icc_level(
				hba->vreg_info.vcc->max_uA,
				POWER_DESC_MAX_ACTV_ICC_LVLS - 1,
				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCC_0]);

	if (hba->vreg_info.vccq && hba->vreg_info.vccq->max_uA)
		icc_level = ufshcd_get_max_icc_level(
				hba->vreg_info.vccq->max_uA,
				icc_level,
				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ_0]);

	if (hba->vreg_info.vccq2 && hba->vreg_info.vccq2->max_uA)
		icc_level = ufshcd_get_max_icc_level(
				hba->vreg_info.vccq2->max_uA,
				icc_level,
				&desc_buf[PWR_DESC_ACTIVE_LVLS_VCCQ2_0]);
out:
	return icc_level;
}

static void ufshcd_init_icc_levels(struct ufs_hba *hba)
{
	int ret;
	int buff_len = hba->desc_size.pwr_desc;
	u8 *desc_buf;

	desc_buf = kmalloc(buff_len, GFP_KERNEL);
	if (!desc_buf)
		return;

	ret = ufshcd_read_power_desc(hba, desc_buf, buff_len);
	if (ret) {
		dev_err(hba->dev,
			"%s: Failed reading power descriptor.len = %d ret = %d",
			__func__, buff_len, ret);
		goto out;
	}

	hba->init_prefetch_data.icc_level =
			ufshcd_find_max_sup_active_icc_level(hba,
			desc_buf, buff_len);
	dev_dbg(hba->dev, "%s: setting icc_level 0x%x",
			__func__, hba->init_prefetch_data.icc_level);

	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
		QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0,
		&hba->init_prefetch_data.icc_level);

	if (ret)
		dev_err(hba->dev,
			"%s: Failed configuring bActiveICCLevel = %d ret = %d",
			__func__, hba->init_prefetch_data.icc_level , ret);

out:
	kfree(desc_buf);
}

/**
 * ufshcd_scsi_add_wlus - Adds required W-LUs
 * @hba: per-adapter instance
 *
 * UFS device specification requires the UFS devices to support 4 well known
 * logical units:
 *	"REPORT_LUNS" (address: 01h)
 *	"UFS Device" (address: 50h)
 *	"RPMB" (address: 44h)
 *	"BOOT" (address: 30h)
 * UFS device's power management needs to be controlled by "POWER CONDITION"
 * field of SSU (START STOP UNIT) command. But this "power condition" field
 * will take effect only when its sent to "UFS device" well known logical unit
 * hence we require the scsi_device instance to represent this logical unit in
 * order for the UFS host driver to send the SSU command for power management.
 *
 * We also require the scsi_device instance for "RPMB" (Replay Protected Memory
 * Block) LU so user space process can control this LU. User space may also
 * want to have access to BOOT LU.
 *
 * This function adds scsi device instances for each of all well known LUs
 * (except "REPORT LUNS" LU).
 *
 * Returns zero on success (all required W-LUs are added successfully),
 * non-zero error value on failure (if failed to add any of the required W-LU).
 */
static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
{
	int ret = 0;
	struct scsi_device *sdev_rpmb;
	struct scsi_device *sdev_boot;

	hba->sdev_ufs_device = __scsi_add_device(hba->host, 0, 0,
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_UFS_DEVICE_WLUN), NULL);
	if (IS_ERR(hba->sdev_ufs_device)) {
		ret = PTR_ERR(hba->sdev_ufs_device);
		hba->sdev_ufs_device = NULL;
		goto out;
	}
	scsi_device_put(hba->sdev_ufs_device);

	sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_RPMB_WLUN), NULL);
	if (IS_ERR(sdev_rpmb)) {
		ret = PTR_ERR(sdev_rpmb);
		goto remove_sdev_ufs_device;
	}
	scsi_device_put(sdev_rpmb);

	sdev_boot = __scsi_add_device(hba->host, 0, 0,
		ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
	if (IS_ERR(sdev_boot))
		dev_err(hba->dev, "%s: BOOT WLUN not found\n", __func__);
	else
		scsi_device_put(sdev_boot);
	goto out;

remove_sdev_ufs_device:
	scsi_remove_device(hba->sdev_ufs_device);
out:
	return ret;
}

static int ufs_get_device_desc(struct ufs_hba *hba,
			       struct ufs_dev_desc *dev_desc)
{
	int err;
	size_t buff_len;
	u8 model_index;
	u8 *desc_buf;

	buff_len = max_t(size_t, hba->desc_size.dev_desc,
			 QUERY_DESC_MAX_SIZE + 1);
	desc_buf = kmalloc(buff_len, GFP_KERNEL);
	if (!desc_buf) {
		err = -ENOMEM;
		goto out;
	}

	err = ufshcd_read_device_desc(hba, desc_buf, hba->desc_size.dev_desc);
	if (err) {
		dev_err(hba->dev, "%s: Failed reading Device Desc. err = %d\n",
			__func__, err);
		goto out;
	}

	/*
	 * getting vendor (manufacturerID) and Bank Index in big endian
	 * format
	 */
	dev_desc->wmanufacturerid = desc_buf[DEVICE_DESC_PARAM_MANF_ID] << 8 |
				     desc_buf[DEVICE_DESC_PARAM_MANF_ID + 1];

	model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];

	/* Zero-pad entire buffer for string termination. */
	memset(desc_buf, 0, buff_len);

	err = ufshcd_read_string_desc(hba, model_index, desc_buf,
				      QUERY_DESC_MAX_SIZE, true/*ASCII*/);
	if (err) {
		dev_err(hba->dev, "%s: Failed reading Product Name. err = %d\n",
			__func__, err);
		goto out;
	}

	desc_buf[QUERY_DESC_MAX_SIZE] = '\0';
	strlcpy(dev_desc->model, (desc_buf + QUERY_DESC_HDR_SIZE),
		min_t(u8, desc_buf[QUERY_DESC_LENGTH_OFFSET],
		      MAX_MODEL_LEN));

	/* Null terminate the model string */
	dev_desc->model[MAX_MODEL_LEN] = '\0';

out:
	kfree(desc_buf);
	return err;
}

static void ufs_fixup_device_setup(struct ufs_hba *hba,
				   struct ufs_dev_desc *dev_desc)
{
	struct ufs_dev_fix *f;

	for (f = ufs_fixups; f->quirk; f++) {
		if ((f->card.wmanufacturerid == dev_desc->wmanufacturerid ||
		     f->card.wmanufacturerid == UFS_ANY_VENDOR) &&
		    (STR_PRFX_EQUAL(f->card.model, dev_desc->model) ||
		     !strcmp(f->card.model, UFS_ANY_MODEL)))
			hba->dev_quirks |= f->quirk;
	}
}

/**
 * ufshcd_tune_pa_tactivate - Tunes PA_TActivate of local UniPro
 * @hba: per-adapter instance
 *
 * PA_TActivate parameter can be tuned manually if UniPro version is less than
 * 1.61. PA_TActivate needs to be greater than or equal to peerM-PHY's
 * RX_MIN_ACTIVATETIME_CAPABILITY attribute. This optimal value can help reduce
 * the hibern8 exit latency.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_tune_pa_tactivate(struct ufs_hba *hba)
{
	int ret = 0;
	u32 peer_rx_min_activatetime = 0, tuned_pa_tactivate;

	ret = ufshcd_dme_peer_get(hba,
				  UIC_ARG_MIB_SEL(
					RX_MIN_ACTIVATETIME_CAPABILITY,
					UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)),
				  &peer_rx_min_activatetime);
	if (ret)
		goto out;

	/* make sure proper unit conversion is applied */
	tuned_pa_tactivate =
		((peer_rx_min_activatetime * RX_MIN_ACTIVATETIME_UNIT_US)
		 / PA_TACTIVATE_TIME_UNIT_US);
	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
			     tuned_pa_tactivate);

out:
	return ret;
}

/**
 * ufshcd_tune_pa_hibern8time - Tunes PA_Hibern8Time of local UniPro
 * @hba: per-adapter instance
 *
 * PA_Hibern8Time parameter can be tuned manually if UniPro version is less than
 * 1.61. PA_Hibern8Time needs to be maximum of local M-PHY's
 * TX_HIBERN8TIME_CAPABILITY & peer M-PHY's RX_HIBERN8TIME_CAPABILITY.
 * This optimal value can help reduce the hibern8 exit latency.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_tune_pa_hibern8time(struct ufs_hba *hba)
{
	int ret = 0;
	u32 local_tx_hibern8_time_cap = 0, peer_rx_hibern8_time_cap = 0;
	u32 max_hibern8_time, tuned_pa_hibern8time;

	ret = ufshcd_dme_get(hba,
			     UIC_ARG_MIB_SEL(TX_HIBERN8TIME_CAPABILITY,
					UIC_ARG_MPHY_TX_GEN_SEL_INDEX(0)),
				  &local_tx_hibern8_time_cap);
	if (ret)
		goto out;

	ret = ufshcd_dme_peer_get(hba,
				  UIC_ARG_MIB_SEL(RX_HIBERN8TIME_CAPABILITY,
					UIC_ARG_MPHY_RX_GEN_SEL_INDEX(0)),
				  &peer_rx_hibern8_time_cap);
	if (ret)
		goto out;

	max_hibern8_time = max(local_tx_hibern8_time_cap,
			       peer_rx_hibern8_time_cap);
	/* make sure proper unit conversion is applied */
	tuned_pa_hibern8time = ((max_hibern8_time * HIBERN8TIME_UNIT_US)
				/ PA_HIBERN8_TIME_UNIT_US);
	ret = ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HIBERN8TIME),
			     tuned_pa_hibern8time);
out:
	return ret;
}

/**
 * ufshcd_quirk_tune_host_pa_tactivate - Ensures that host PA_TACTIVATE is
 * less than device PA_TACTIVATE time.
 * @hba: per-adapter instance
 *
 * Some UFS devices require host PA_TACTIVATE to be lower than device
 * PA_TACTIVATE, we need to enable UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE quirk
 * for such devices.
 *
 * Returns zero on success, non-zero error value on failure.
 */
static int ufshcd_quirk_tune_host_pa_tactivate(struct ufs_hba *hba)
{
	int ret = 0;
	u32 granularity, peer_granularity;
	u32 pa_tactivate, peer_pa_tactivate;
	u32 pa_tactivate_us, peer_pa_tactivate_us;
	u8 gran_to_us_table[] = {1, 4, 8, 16, 32, 100};

	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
				  &granularity);
	if (ret)
		goto out;

	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
				  &peer_granularity);
	if (ret)
		goto out;

	if ((granularity < PA_GRANULARITY_MIN_VAL) ||
	    (granularity > PA_GRANULARITY_MAX_VAL)) {
		dev_err(hba->dev, "%s: invalid host PA_GRANULARITY %d",
			__func__, granularity);
		return -EINVAL;
	}

	if ((peer_granularity < PA_GRANULARITY_MIN_VAL) ||
	    (peer_granularity > PA_GRANULARITY_MAX_VAL)) {
		dev_err(hba->dev, "%s: invalid device PA_GRANULARITY %d",
			__func__, peer_granularity);
		return -EINVAL;
	}

	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate);
	if (ret)
		goto out;

	ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE),
				  &peer_pa_tactivate);
	if (ret)
		goto out;

	pa_tactivate_us = pa_tactivate * gran_to_us_table[granularity - 1];
	peer_pa_tactivate_us = peer_pa_tactivate *
			     gran_to_us_table[peer_granularity - 1];

	if (pa_tactivate_us > peer_pa_tactivate_us) {
		u32 new_peer_pa_tactivate;

		new_peer_pa_tactivate = pa_tactivate_us /
				      gran_to_us_table[peer_granularity - 1];
		new_peer_pa_tactivate++;
		ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
					  new_peer_pa_tactivate);
	}

out:
	return ret;
}

static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
{
	if (ufshcd_is_unipro_pa_params_tuning_req(hba)) {
		ufshcd_tune_pa_tactivate(hba);
		ufshcd_tune_pa_hibern8time(hba);
	}

	if (hba->dev_quirks & UFS_DEVICE_QUIRK_PA_TACTIVATE)
		/* set 1ms timeout for PA_TACTIVATE */
		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 10);

	if (hba->dev_quirks & UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE)
		ufshcd_quirk_tune_host_pa_tactivate(hba);

	ufshcd_vops_apply_dev_quirks(hba);
}

static void ufshcd_clear_dbg_ufs_stats(struct ufs_hba *hba)
{
	int err_reg_hist_size = sizeof(struct ufs_uic_err_reg_hist);

	hba->ufs_stats.hibern8_exit_cnt = 0;
	hba->ufs_stats.last_hibern8_exit_tstamp = ktime_set(0, 0);

	memset(&hba->ufs_stats.pa_err, 0, err_reg_hist_size);
	memset(&hba->ufs_stats.dl_err, 0, err_reg_hist_size);
	memset(&hba->ufs_stats.nl_err, 0, err_reg_hist_size);
	memset(&hba->ufs_stats.tl_err, 0, err_reg_hist_size);
	memset(&hba->ufs_stats.dme_err, 0, err_reg_hist_size);

	hba->req_abort_count = 0;
}

static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
{
	int err;

	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_DEVICE, 0,
		&hba->desc_size.dev_desc);
	if (err)
		hba->desc_size.dev_desc = QUERY_DESC_DEVICE_DEF_SIZE;

	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_POWER, 0,
		&hba->desc_size.pwr_desc);
	if (err)
		hba->desc_size.pwr_desc = QUERY_DESC_POWER_DEF_SIZE;

	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_INTERCONNECT, 0,
		&hba->desc_size.interc_desc);
	if (err)
		hba->desc_size.interc_desc = QUERY_DESC_INTERCONNECT_DEF_SIZE;

	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_CONFIGURATION, 0,
		&hba->desc_size.conf_desc);
	if (err)
		hba->desc_size.conf_desc = QUERY_DESC_CONFIGURATION_DEF_SIZE;

	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_UNIT, 0,
		&hba->desc_size.unit_desc);
	if (err)
		hba->desc_size.unit_desc = QUERY_DESC_UNIT_DEF_SIZE;

	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_GEOMETRY, 0,
		&hba->desc_size.geom_desc);
	if (err)
		hba->desc_size.geom_desc = QUERY_DESC_GEOMETRY_DEF_SIZE;
	err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_HEALTH, 0,
		&hba->desc_size.hlth_desc);
	if (err)
		hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
}

static void ufshcd_def_desc_sizes(struct ufs_hba *hba)
{
	hba->desc_size.dev_desc = QUERY_DESC_DEVICE_DEF_SIZE;
	hba->desc_size.pwr_desc = QUERY_DESC_POWER_DEF_SIZE;
	hba->desc_size.interc_desc = QUERY_DESC_INTERCONNECT_DEF_SIZE;
	hba->desc_size.conf_desc = QUERY_DESC_CONFIGURATION_DEF_SIZE;
	hba->desc_size.unit_desc = QUERY_DESC_UNIT_DEF_SIZE;
	hba->desc_size.geom_desc = QUERY_DESC_GEOMETRY_DEF_SIZE;
	hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
}

static struct ufs_ref_clk ufs_ref_clk_freqs[] = {
	{19200000, REF_CLK_FREQ_19_2_MHZ},
	{26000000, REF_CLK_FREQ_26_MHZ},
	{38400000, REF_CLK_FREQ_38_4_MHZ},
	{52000000, REF_CLK_FREQ_52_MHZ},
	{0, REF_CLK_FREQ_INVAL},
};

static enum ufs_ref_clk_freq
ufs_get_bref_clk_from_hz(unsigned long freq)
{
	int i;

	for (i = 0; ufs_ref_clk_freqs[i].freq_hz; i++)
		if (ufs_ref_clk_freqs[i].freq_hz == freq)
			return ufs_ref_clk_freqs[i].val;

	return REF_CLK_FREQ_INVAL;
}

void ufshcd_parse_dev_ref_clk_freq(struct ufs_hba *hba, struct clk *refclk)
{
	unsigned long freq;

	freq = clk_get_rate(refclk);

	hba->dev_ref_clk_freq =
		ufs_get_bref_clk_from_hz(freq);

	if (hba->dev_ref_clk_freq == REF_CLK_FREQ_INVAL)
		dev_err(hba->dev,
		"invalid ref_clk setting = %ld\n", freq);
}

static int ufshcd_set_dev_ref_clk(struct ufs_hba *hba)
{
	int err;
	u32 ref_clk;
	u32 freq = hba->dev_ref_clk_freq;

	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
			QUERY_ATTR_IDN_REF_CLK_FREQ, 0, 0, &ref_clk);

	if (err) {
		dev_err(hba->dev, "failed reading bRefClkFreq. err = %d\n",
			err);
		goto out;
	}

	if (ref_clk == freq)
		goto out; /* nothing to update */

	err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
			QUERY_ATTR_IDN_REF_CLK_FREQ, 0, 0, &freq);

	if (err) {
		dev_err(hba->dev, "bRefClkFreq setting to %lu Hz failed\n",
			ufs_ref_clk_freqs[freq].freq_hz);
		goto out;
	}

	dev_dbg(hba->dev, "bRefClkFreq setting to %lu Hz succeeded\n",
			ufs_ref_clk_freqs[freq].freq_hz);

out:
	return err;
}

/**
 * ufshcd_probe_hba - probe hba to detect device and initialize
 * @hba: per-adapter instance
 *
 * Execute link-startup and verify device initialization
 */
static int ufshcd_probe_hba(struct ufs_hba *hba)
{
	struct ufs_dev_desc card = {0};
	int ret;
	ktime_t start = ktime_get();

	ret = ufshcd_link_startup(hba);
	if (ret)
		goto out;

	/* set the default level for urgent bkops */
	hba->urgent_bkops_lvl = BKOPS_STATUS_PERF_IMPACT;
	hba->is_urgent_bkops_lvl_checked = false;

	/* Debug counters initialization */
	ufshcd_clear_dbg_ufs_stats(hba);

	/* UniPro link is active now */
	ufshcd_set_link_active(hba);

	/* Enable Auto-Hibernate if configured */
	ufshcd_auto_hibern8_enable(hba);

	ret = ufshcd_verify_dev_init(hba);
	if (ret)
		goto out;

	ret = ufshcd_complete_dev_init(hba);
	if (ret)
		goto out;

	/* Init check for device descriptor sizes */
	ufshcd_init_desc_sizes(hba);

	ret = ufs_get_device_desc(hba, &card);
	if (ret) {
		dev_err(hba->dev, "%s: Failed getting device info. err = %d\n",
			__func__, ret);
		goto out;
	}

	ufs_fixup_device_setup(hba, &card);
	ufshcd_tune_unipro_params(hba);

	/* UFS device is also active now */
	ufshcd_set_ufs_dev_active(hba);
	ufshcd_force_reset_auto_bkops(hba);
	hba->wlun_dev_clr_ua = true;

	if (ufshcd_get_max_pwr_mode(hba)) {
		dev_err(hba->dev,
			"%s: Failed getting max supported power mode\n",
			__func__);
	} else {
		/*
		 * Set the right value to bRefClkFreq before attempting to
		 * switch to HS gears.
		 */
		if (hba->dev_ref_clk_freq != REF_CLK_FREQ_INVAL)
			ufshcd_set_dev_ref_clk(hba);
		ret = ufshcd_config_pwr_mode(hba, &hba->max_pwr_info.info);
		if (ret) {
			dev_err(hba->dev, "%s: Failed setting power mode, err = %d\n",
					__func__, ret);
			goto out;
		}
	}

	/* set the state as operational after switching to desired gear */
	hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;

	/*
	 * If we are in error handling context or in power management callbacks
	 * context, no need to scan the host
	 */
	if (!ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
		bool flag;

		/* clear any previous UFS device information */
		memset(&hba->dev_info, 0, sizeof(hba->dev_info));
		if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
				QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
			hba->dev_info.f_power_on_wp_en = flag;

		if (!hba->is_init_prefetch)
			ufshcd_init_icc_levels(hba);

		/* Add required well known logical units to scsi mid layer */
		if (ufshcd_scsi_add_wlus(hba))
			goto out;

		/* Initialize devfreq after UFS device is detected */
		if (ufshcd_is_clkscaling_supported(hba)) {
			memcpy(&hba->clk_scaling.saved_pwr_info.info,
				&hba->pwr_info,
				sizeof(struct ufs_pa_layer_attr));
			hba->clk_scaling.saved_pwr_info.is_valid = true;
			if (!hba->devfreq) {
				ret = ufshcd_devfreq_init(hba);
				if (ret)
					goto out;
			}
			hba->clk_scaling.is_allowed = true;
		}

		ufs_bsg_probe(hba);

		scsi_scan_host(hba->host);
		pm_runtime_put_sync(hba->dev);
	}

	if (!hba->is_init_prefetch)
		hba->is_init_prefetch = true;

out:
	/*
	 * If we failed to initialize the device or the device is not
	 * present, turn off the power/clocks etc.
	 */
	if (ret && !ufshcd_eh_in_progress(hba) && !hba->pm_op_in_progress) {
		pm_runtime_put_sync(hba->dev);
		ufshcd_exit_clk_scaling(hba);
		ufshcd_hba_exit(hba);
	}

	trace_ufshcd_init(dev_name(hba->dev), ret,
		ktime_to_us(ktime_sub(ktime_get(), start)),
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	return ret;
}

/**
 * ufshcd_async_scan - asynchronous execution for probing hba
 * @data: data pointer to pass to this function
 * @cookie: cookie data
 */
static void ufshcd_async_scan(void *data, async_cookie_t cookie)
{
	struct ufs_hba *hba = (struct ufs_hba *)data;

	ufshcd_probe_hba(hba);
}

static enum blk_eh_timer_return ufshcd_eh_timed_out(struct scsi_cmnd *scmd)
{
	unsigned long flags;
	struct Scsi_Host *host;
	struct ufs_hba *hba;
	int index;
	bool found = false;

	if (!scmd || !scmd->device || !scmd->device->host)
		return BLK_EH_DONE;

	host = scmd->device->host;
	hba = shost_priv(host);
	if (!hba)
		return BLK_EH_DONE;

	spin_lock_irqsave(host->host_lock, flags);

	for_each_set_bit(index, &hba->outstanding_reqs, hba->nutrs) {
		if (hba->lrb[index].cmd == scmd) {
			found = true;
			break;
		}
	}

	spin_unlock_irqrestore(host->host_lock, flags);

	/*
	 * Bypass SCSI error handling and reset the block layer timer if this
	 * SCSI command was not actually dispatched to UFS driver, otherwise
	 * let SCSI layer handle the error as usual.
	 */
	return found ? BLK_EH_DONE : BLK_EH_RESET_TIMER;
}

static const struct attribute_group *ufshcd_driver_groups[] = {
	&ufs_sysfs_unit_descriptor_group,
	&ufs_sysfs_lun_attributes_group,
	NULL,
};

static struct scsi_host_template ufshcd_driver_template = {
	.module			= THIS_MODULE,
	.name			= UFSHCD,
	.proc_name		= UFSHCD,
	.queuecommand		= ufshcd_queuecommand,
	.slave_alloc		= ufshcd_slave_alloc,
	.slave_configure	= ufshcd_slave_configure,
	.slave_destroy		= ufshcd_slave_destroy,
	.change_queue_depth	= ufshcd_change_queue_depth,
	.eh_abort_handler	= ufshcd_abort,
	.eh_device_reset_handler = ufshcd_eh_device_reset_handler,
	.eh_host_reset_handler   = ufshcd_eh_host_reset_handler,
	.eh_timed_out		= ufshcd_eh_timed_out,
	.this_id		= -1,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= UFSHCD_CMD_PER_LUN,
	.can_queue		= UFSHCD_CAN_QUEUE,
	.max_segment_size	= PRDT_DATA_BYTE_COUNT_MAX,
	.max_host_blocked	= 1,
	.track_queue_depth	= 1,
	.sdev_groups		= ufshcd_driver_groups,
	.dma_boundary		= PAGE_SIZE - 1,
};

static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
				   int ua)
{
	int ret;

	if (!vreg)
		return 0;

	/*
	 * "set_load" operation shall be required on those regulators
	 * which specifically configured current limitation. Otherwise
	 * zero max_uA may cause unexpected behavior when regulator is
	 * enabled or set as high power mode.
	 */
	if (!vreg->max_uA)
		return 0;

	ret = regulator_set_load(vreg->reg, ua);
	if (ret < 0) {
		dev_err(dev, "%s: %s set load (ua=%d) failed, err=%d\n",
				__func__, vreg->name, ua, ret);
	}

	return ret;
}

static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
					 struct ufs_vreg *vreg)
{
	return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
}

static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
					 struct ufs_vreg *vreg)
{
	if (!vreg)
		return 0;

	return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
}

static int ufshcd_config_vreg(struct device *dev,
		struct ufs_vreg *vreg, bool on)
{
	int ret = 0;
	struct regulator *reg;
	const char *name;
	int min_uV, uA_load;

	BUG_ON(!vreg);

	reg = vreg->reg;
	name = vreg->name;

	if (regulator_count_voltages(reg) > 0) {
		if (vreg->min_uV && vreg->max_uV) {
			min_uV = on ? vreg->min_uV : 0;
			ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);
			if (ret) {
				dev_err(dev,
					"%s: %s set voltage failed, err=%d\n",
					__func__, name, ret);
				goto out;
			}
		}

		uA_load = on ? vreg->max_uA : 0;
		ret = ufshcd_config_vreg_load(dev, vreg, uA_load);
		if (ret)
			goto out;
	}
out:
	return ret;
}

static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
	int ret = 0;

	if (!vreg || vreg->enabled)
		goto out;

	ret = ufshcd_config_vreg(dev, vreg, true);
	if (!ret)
		ret = regulator_enable(vreg->reg);

	if (!ret)
		vreg->enabled = true;
	else
		dev_err(dev, "%s: %s enable failed, err=%d\n",
				__func__, vreg->name, ret);
out:
	return ret;
}

static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
	int ret = 0;

	if (!vreg || !vreg->enabled)
		goto out;

	ret = regulator_disable(vreg->reg);

	if (!ret) {
		/* ignore errors on applying disable config */
		ufshcd_config_vreg(dev, vreg, false);
		vreg->enabled = false;
	} else {
		dev_err(dev, "%s: %s disable failed, err=%d\n",
				__func__, vreg->name, ret);
	}
out:
	return ret;
}

static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
{
	int ret = 0;
	struct device *dev = hba->dev;
	struct ufs_vreg_info *info = &hba->vreg_info;

	ret = ufshcd_toggle_vreg(dev, info->vcc, on);
	if (ret)
		goto out;

	ret = ufshcd_toggle_vreg(dev, info->vccq, on);
	if (ret)
		goto out;

	ret = ufshcd_toggle_vreg(dev, info->vccq2, on);
	if (ret)
		goto out;

out:
	if (ret) {
		ufshcd_toggle_vreg(dev, info->vccq2, false);
		ufshcd_toggle_vreg(dev, info->vccq, false);
		ufshcd_toggle_vreg(dev, info->vcc, false);
	}
	return ret;
}

static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on)
{
	struct ufs_vreg_info *info = &hba->vreg_info;

	return ufshcd_toggle_vreg(hba->dev, info->vdd_hba, on);
}

static int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg)
{
	int ret = 0;

	if (!vreg)
		goto out;

	vreg->reg = devm_regulator_get(dev, vreg->name);
	if (IS_ERR(vreg->reg)) {
		ret = PTR_ERR(vreg->reg);
		dev_err(dev, "%s: %s get failed, err=%d\n",
				__func__, vreg->name, ret);
	}
out:
	return ret;
}

static int ufshcd_init_vreg(struct ufs_hba *hba)
{
	int ret = 0;
	struct device *dev = hba->dev;
	struct ufs_vreg_info *info = &hba->vreg_info;

	ret = ufshcd_get_vreg(dev, info->vcc);
	if (ret)
		goto out;

	ret = ufshcd_get_vreg(dev, info->vccq);
	if (ret)
		goto out;

	ret = ufshcd_get_vreg(dev, info->vccq2);
out:
	return ret;
}

static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
{
	struct ufs_vreg_info *info = &hba->vreg_info;

	if (info)
		return ufshcd_get_vreg(hba->dev, info->vdd_hba);

	return 0;
}

static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
					bool skip_ref_clk)
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct list_head *head = &hba->clk_list_head;
	unsigned long flags;
	ktime_t start = ktime_get();
	bool clk_state_changed = false;

	if (list_empty(head))
		goto out;

	/*
	 * vendor specific setup_clocks ops may depend on clocks managed by
	 * this standard driver hence call the vendor specific setup_clocks
	 * before disabling the clocks managed here.
	 */
	if (!on) {
		ret = ufshcd_vops_setup_clocks(hba, on, PRE_CHANGE);
		if (ret)
			return ret;
	}

	list_for_each_entry(clki, head, list) {
		if (!IS_ERR_OR_NULL(clki->clk)) {
			if (skip_ref_clk && !strcmp(clki->name, "ref_clk"))
				continue;

			clk_state_changed = on ^ clki->enabled;
			if (on && !clki->enabled) {
				ret = clk_prepare_enable(clki->clk);
				if (ret) {
					dev_err(hba->dev, "%s: %s prepare enable failed, %d\n",
						__func__, clki->name, ret);
					goto out;
				}
			} else if (!on && clki->enabled) {
				clk_disable_unprepare(clki->clk);
			}
			clki->enabled = on;
			dev_dbg(hba->dev, "%s: clk: %s %sabled\n", __func__,
					clki->name, on ? "en" : "dis");
		}
	}

	/*
	 * vendor specific setup_clocks ops may depend on clocks managed by
	 * this standard driver hence call the vendor specific setup_clocks
	 * after enabling the clocks managed here.
	 */
	if (on) {
		ret = ufshcd_vops_setup_clocks(hba, on, POST_CHANGE);
		if (ret)
			return ret;
	}

out:
	if (ret) {
		list_for_each_entry(clki, head, list) {
			if (!IS_ERR_OR_NULL(clki->clk) && clki->enabled)
				clk_disable_unprepare(clki->clk);
		}
	} else if (!ret && on) {
		spin_lock_irqsave(hba->host->host_lock, flags);
		hba->clk_gating.state = CLKS_ON;
		trace_ufshcd_clk_gating(dev_name(hba->dev),
					hba->clk_gating.state);
		spin_unlock_irqrestore(hba->host->host_lock, flags);
	}

	if (clk_state_changed)
		trace_ufshcd_profile_clk_gating(dev_name(hba->dev),
			(on ? "on" : "off"),
			ktime_to_us(ktime_sub(ktime_get(), start)), ret);
	return ret;
}

static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
{
	return  __ufshcd_setup_clocks(hba, on, false);
}

static int ufshcd_init_clocks(struct ufs_hba *hba)
{
	int ret = 0;
	struct ufs_clk_info *clki;
	struct device *dev = hba->dev;
	struct list_head *head = &hba->clk_list_head;

	if (list_empty(head))
		goto out;

	list_for_each_entry(clki, head, list) {
		if (!clki->name)
			continue;

		clki->clk = devm_clk_get(dev, clki->name);
		if (IS_ERR(clki->clk)) {
			ret = PTR_ERR(clki->clk);
			dev_err(dev, "%s: %s clk get failed, %d\n",
					__func__, clki->name, ret);
			goto out;
		}

		/*
		 * Parse device ref clk freq as per device tree "ref_clk".
		 * Default dev_ref_clk_freq is set to REF_CLK_FREQ_INVAL
		 * in ufshcd_alloc_host().
		 */
		if (!strcmp(clki->name, "ref_clk"))
			ufshcd_parse_dev_ref_clk_freq(hba, clki->clk);

		if (clki->max_freq) {
			ret = clk_set_rate(clki->clk, clki->max_freq);
			if (ret) {
				dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
					__func__, clki->name,
					clki->max_freq, ret);
				goto out;
			}
			clki->curr_freq = clki->max_freq;
		}
		dev_dbg(dev, "%s: clk: %s, rate: %lu\n", __func__,
				clki->name, clk_get_rate(clki->clk));
	}
out:
	return ret;
}

static int ufshcd_variant_hba_init(struct ufs_hba *hba)
{
	int err = 0;

	if (!hba->vops)
		goto out;

	err = ufshcd_vops_init(hba);
	if (err)
		goto out;

	err = ufshcd_vops_setup_regulators(hba, true);
	if (err)
		goto out_exit;

	goto out;

out_exit:
	ufshcd_vops_exit(hba);
out:
	if (err)
		dev_err(hba->dev, "%s: variant %s init failed err %d\n",
			__func__, ufshcd_get_var_name(hba), err);
	return err;
}

static void ufshcd_variant_hba_exit(struct ufs_hba *hba)
{
	if (!hba->vops)
		return;

	ufshcd_vops_setup_regulators(hba, false);

	ufshcd_vops_exit(hba);
}

static int ufshcd_hba_init(struct ufs_hba *hba)
{
	int err;

	/*
	 * Handle host controller power separately from the UFS device power
	 * rails as it will help controlling the UFS host controller power
	 * collapse easily which is different than UFS device power collapse.
	 * Also, enable the host controller power before we go ahead with rest
	 * of the initialization here.
	 */
	err = ufshcd_init_hba_vreg(hba);
	if (err)
		goto out;

	err = ufshcd_setup_hba_vreg(hba, true);
	if (err)
		goto out;

	err = ufshcd_init_clocks(hba);
	if (err)
		goto out_disable_hba_vreg;

	err = ufshcd_setup_clocks(hba, true);
	if (err)
		goto out_disable_hba_vreg;

	err = ufshcd_init_vreg(hba);
	if (err)
		goto out_disable_clks;

	err = ufshcd_setup_vreg(hba, true);
	if (err)
		goto out_disable_clks;

	err = ufshcd_variant_hba_init(hba);
	if (err)
		goto out_disable_vreg;

	hba->is_powered = true;
	goto out;

out_disable_vreg:
	ufshcd_setup_vreg(hba, false);
out_disable_clks:
	ufshcd_setup_clocks(hba, false);
out_disable_hba_vreg:
	ufshcd_setup_hba_vreg(hba, false);
out:
	return err;
}

static void ufshcd_hba_exit(struct ufs_hba *hba)
{
	if (hba->is_powered) {
		ufshcd_variant_hba_exit(hba);
		ufshcd_setup_vreg(hba, false);
		ufshcd_suspend_clkscaling(hba);
		if (ufshcd_is_clkscaling_supported(hba))
			if (hba->devfreq)
				ufshcd_suspend_clkscaling(hba);
		ufshcd_setup_clocks(hba, false);
		ufshcd_setup_hba_vreg(hba, false);
		hba->is_powered = false;
	}
}

static int
ufshcd_send_request_sense(struct ufs_hba *hba, struct scsi_device *sdp)
{
	unsigned char cmd[6] = {REQUEST_SENSE,
				0,
				0,
				0,
				UFS_SENSE_SIZE,
				0};
	char *buffer;
	int ret;

	buffer = kzalloc(UFS_SENSE_SIZE, GFP_KERNEL);
	if (!buffer) {
		ret = -ENOMEM;
		goto out;
	}

	ret = scsi_execute(sdp, cmd, DMA_FROM_DEVICE, buffer,
			UFS_SENSE_SIZE, NULL, NULL,
			msecs_to_jiffies(1000), 3, 0, RQF_PM, NULL);
	if (ret)
		pr_err("%s: failed with err %d\n", __func__, ret);

	kfree(buffer);
out:
	return ret;
}

/**
 * ufshcd_set_dev_pwr_mode - sends START STOP UNIT command to set device
 *			     power mode
 * @hba: per adapter instance
 * @pwr_mode: device power mode to set
 *
 * Returns 0 if requested power mode is set successfully
 * Returns non-zero if failed to set the requested power mode
 */
static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
				     enum ufs_dev_pwr_mode pwr_mode)
{
	unsigned char cmd[6] = { START_STOP };
	struct scsi_sense_hdr sshdr;
	struct scsi_device *sdp;
	unsigned long flags;
	int ret;

	spin_lock_irqsave(hba->host->host_lock, flags);
	sdp = hba->sdev_ufs_device;
	if (sdp) {
		ret = scsi_device_get(sdp);
		if (!ret && !scsi_device_online(sdp)) {
			ret = -ENODEV;
			scsi_device_put(sdp);
		}
	} else {
		ret = -ENODEV;
	}
	spin_unlock_irqrestore(hba->host->host_lock, flags);

	if (ret)
		return ret;

	/*
	 * If scsi commands fail, the scsi mid-layer schedules scsi error-
	 * handling, which would wait for host to be resumed. Since we know
	 * we are functional while we are here, skip host resume in error
	 * handling context.
	 */
	hba->host->eh_noresume = 1;
	if (hba->wlun_dev_clr_ua) {
		ret = ufshcd_send_request_sense(hba, sdp);
		if (ret)
			goto out;
		/* Unit attention condition is cleared now */
		hba->wlun_dev_clr_ua = false;
	}

	cmd[4] = pwr_mode << 4;

	/*
	 * Current function would be generally called from the power management
	 * callbacks hence set the RQF_PM flag so that it doesn't resume the
	 * already suspended childs.
	 */
	ret = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
			START_STOP_TIMEOUT, 0, 0, RQF_PM, NULL);
	if (ret) {
		sdev_printk(KERN_WARNING, sdp,
			    "START_STOP failed for power mode: %d, result %x\n",
			    pwr_mode, ret);
		if (driver_byte(ret) == DRIVER_SENSE)
			scsi_print_sense_hdr(sdp, NULL, &sshdr);
	}

	if (!ret)
		hba->curr_dev_pwr_mode = pwr_mode;
out:
	scsi_device_put(sdp);
	hba->host->eh_noresume = 0;
	return ret;
}

static int ufshcd_link_state_transition(struct ufs_hba *hba,
					enum uic_link_state req_link_state,
					int check_for_bkops)
{
	int ret = 0;

	if (req_link_state == hba->uic_link_state)
		return 0;

	if (req_link_state == UIC_LINK_HIBERN8_STATE) {
		ret = ufshcd_uic_hibern8_enter(hba);
		if (!ret)
			ufshcd_set_link_hibern8(hba);
		else
			goto out;
	}
	/*
	 * If autobkops is enabled, link can't be turned off because
	 * turning off the link would also turn off the device.
	 */
	else if ((req_link_state == UIC_LINK_OFF_STATE) &&
		   (!check_for_bkops || (check_for_bkops &&
		    !hba->auto_bkops_enabled))) {
		/*
		 * Let's make sure that link is in low power mode, we are doing
		 * this currently by putting the link in Hibern8. Otherway to
		 * put the link in low power mode is to send the DME end point
		 * to device and then send the DME reset command to local
		 * unipro. But putting the link in hibern8 is much faster.
		 */
		ret = ufshcd_uic_hibern8_enter(hba);
		if (ret)
			goto out;
		/*
		 * Change controller state to "reset state" which
		 * should also put the link in off/reset state
		 */
		ufshcd_hba_stop(hba, true);
		/*
		 * TODO: Check if we need any delay to make sure that
		 * controller is reset
		 */
		ufshcd_set_link_off(hba);
	}

out:
	return ret;
}

static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
{
	/*
	 * It seems some UFS devices may keep drawing more than sleep current
	 * (atleast for 500us) from UFS rails (especially from VCCQ rail).
	 * To avoid this situation, add 2ms delay before putting these UFS
	 * rails in LPM mode.
	 */
	if (!ufshcd_is_link_active(hba) &&
	    hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM)
		usleep_range(2000, 2100);

	/*
	 * If UFS device is either in UFS_Sleep turn off VCC rail to save some
	 * power.
	 *
	 * If UFS device and link is in OFF state, all power supplies (VCC,
	 * VCCQ, VCCQ2) can be turned off if power on write protect is not
	 * required. If UFS link is inactive (Hibern8 or OFF state) and device
	 * is in sleep state, put VCCQ & VCCQ2 rails in LPM mode.
	 *
	 * Ignore the error returned by ufshcd_toggle_vreg() as device is anyway
	 * in low power state which would save some power.
	 */
	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
	    !hba->dev_info.is_lu_power_on_wp) {
		ufshcd_setup_vreg(hba, false);
	} else if (!ufshcd_is_ufs_dev_active(hba)) {
		ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
		if (!ufshcd_is_link_active(hba)) {
			ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
			ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
		}
	}
}

static int ufshcd_vreg_set_hpm(struct ufs_hba *hba)
{
	int ret = 0;

	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
	    !hba->dev_info.is_lu_power_on_wp) {
		ret = ufshcd_setup_vreg(hba, true);
	} else if (!ufshcd_is_ufs_dev_active(hba)) {
		if (!ret && !ufshcd_is_link_active(hba)) {
			ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq);
			if (ret)
				goto vcc_disable;
			ret = ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2);
			if (ret)
				goto vccq_lpm;
		}
		ret = ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, true);
	}
	goto out;

vccq_lpm:
	ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
vcc_disable:
	ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
out:
	return ret;
}

static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba)
{
	if (ufshcd_is_link_off(hba))
		ufshcd_setup_hba_vreg(hba, false);
}

static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba)
{
	if (ufshcd_is_link_off(hba))
		ufshcd_setup_hba_vreg(hba, true);
}

/**
 * ufshcd_suspend - helper function for suspend operations
 * @hba: per adapter instance
 * @pm_op: desired low power operation type
 *
 * This function will try to put the UFS device and link into low power
 * mode based on the "rpm_lvl" (Runtime PM level) or "spm_lvl"
 * (System PM level).
 *
 * If this function is called during shutdown, it will make sure that
 * both UFS device and UFS link is powered off.
 *
 * NOTE: UFS device & link must be active before we enter in this function.
 *
 * Returns 0 for success and non-zero for failure
 */
static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
	int ret = 0;
	enum ufs_pm_level pm_lvl;
	enum ufs_dev_pwr_mode req_dev_pwr_mode;
	enum uic_link_state req_link_state;

	hba->pm_op_in_progress = 1;
	if (!ufshcd_is_shutdown_pm(pm_op)) {
		pm_lvl = ufshcd_is_runtime_pm(pm_op) ?
			 hba->rpm_lvl : hba->spm_lvl;
		req_dev_pwr_mode = ufs_get_pm_lvl_to_dev_pwr_mode(pm_lvl);
		req_link_state = ufs_get_pm_lvl_to_link_pwr_state(pm_lvl);
	} else {
		req_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE;
		req_link_state = UIC_LINK_OFF_STATE;
	}

	/*
	 * If we can't transition into any of the low power modes
	 * just gate the clocks.
	 */
	ufshcd_hold(hba, false);
	hba->clk_gating.is_suspended = true;

	if (hba->clk_scaling.is_allowed) {
		cancel_work_sync(&hba->clk_scaling.suspend_work);
		cancel_work_sync(&hba->clk_scaling.resume_work);
		ufshcd_suspend_clkscaling(hba);
	}

	if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE &&
			req_link_state == UIC_LINK_ACTIVE_STATE) {
		goto disable_clks;
	}

	if ((req_dev_pwr_mode == hba->curr_dev_pwr_mode) &&
	    (req_link_state == hba->uic_link_state))
		goto enable_gating;

	/* UFS device & link must be active before we enter in this function */
	if (!ufshcd_is_ufs_dev_active(hba) || !ufshcd_is_link_active(hba)) {
		ret = -EINVAL;
		goto enable_gating;
	}

	if (ufshcd_is_runtime_pm(pm_op)) {
		if (ufshcd_can_autobkops_during_suspend(hba)) {
			/*
			 * The device is idle with no requests in the queue,
			 * allow background operations if bkops status shows
			 * that performance might be impacted.
			 */
			ret = ufshcd_urgent_bkops(hba);
			if (ret)
				goto enable_gating;
		} else {
			/* make sure that auto bkops is disabled */
			ufshcd_disable_auto_bkops(hba);
		}
	}

	if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) &&
	     ((ufshcd_is_runtime_pm(pm_op) && !hba->auto_bkops_enabled) ||
	       !ufshcd_is_runtime_pm(pm_op))) {
		/* ensure that bkops is disabled */
		ufshcd_disable_auto_bkops(hba);
		ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
		if (ret)
			goto enable_gating;
	}

	ret = ufshcd_link_state_transition(hba, req_link_state, 1);
	if (ret)
		goto set_dev_active;

	ufshcd_vreg_set_lpm(hba);

disable_clks:
	/*
	 * Call vendor specific suspend callback. As these callbacks may access
	 * vendor specific host controller register space call them before the
	 * host clocks are ON.
	 */
	ret = ufshcd_vops_suspend(hba, pm_op);
	if (ret)
		goto set_link_active;

	if (!ufshcd_is_link_active(hba))
		ufshcd_setup_clocks(hba, false);
	else
		/* If link is active, device ref_clk can't be switched off */
		__ufshcd_setup_clocks(hba, false, true);

	hba->clk_gating.state = CLKS_OFF;
	trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state);
	/*
	 * Disable the host irq as host controller as there won't be any
	 * host controller transaction expected till resume.
	 */
	ufshcd_disable_irq(hba);
	/* Put the host controller in low power mode if possible */
	ufshcd_hba_vreg_set_lpm(hba);
	goto out;

set_link_active:
	if (hba->clk_scaling.is_allowed)
		ufshcd_resume_clkscaling(hba);
	ufshcd_vreg_set_hpm(hba);
	if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba))
		ufshcd_set_link_active(hba);
	else if (ufshcd_is_link_off(hba))
		ufshcd_host_reset_and_restore(hba);
set_dev_active:
	if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE))
		ufshcd_disable_auto_bkops(hba);
enable_gating:
	if (hba->clk_scaling.is_allowed)
		ufshcd_resume_clkscaling(hba);
	hba->clk_gating.is_suspended = false;
	ufshcd_release(hba);
out:
	hba->pm_op_in_progress = 0;
	return ret;
}

/**
 * ufshcd_resume - helper function for resume operations
 * @hba: per adapter instance
 * @pm_op: runtime PM or system PM
 *
 * This function basically brings the UFS device, UniPro link and controller
 * to active state.
 *
 * Returns 0 for success and non-zero for failure
 */
static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
	int ret;
	enum uic_link_state old_link_state;

	hba->pm_op_in_progress = 1;
	old_link_state = hba->uic_link_state;

	ufshcd_hba_vreg_set_hpm(hba);
	/* Make sure clocks are enabled before accessing controller */
	ret = ufshcd_setup_clocks(hba, true);
	if (ret)
		goto out;

	/* enable the host irq as host controller would be active soon */
	ret = ufshcd_enable_irq(hba);
	if (ret)
		goto disable_irq_and_vops_clks;

	ret = ufshcd_vreg_set_hpm(hba);
	if (ret)
		goto disable_irq_and_vops_clks;

	/*
	 * Call vendor specific resume callback. As these callbacks may access
	 * vendor specific host controller register space call them when the
	 * host clocks are ON.
	 */
	ret = ufshcd_vops_resume(hba, pm_op);
	if (ret)
		goto disable_vreg;

	if (ufshcd_is_link_hibern8(hba)) {
		ret = ufshcd_uic_hibern8_exit(hba);
		if (!ret)
			ufshcd_set_link_active(hba);
		else
			goto vendor_suspend;
	} else if (ufshcd_is_link_off(hba)) {
		ret = ufshcd_host_reset_and_restore(hba);
		/*
		 * ufshcd_host_reset_and_restore() should have already
		 * set the link state as active
		 */
		if (ret || !ufshcd_is_link_active(hba))
			goto vendor_suspend;
	}

	if (!ufshcd_is_ufs_dev_active(hba)) {
		ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
		if (ret)
			goto set_old_link_state;
	}

	if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
		ufshcd_enable_auto_bkops(hba);
	else
		/*
		 * If BKOPs operations are urgently needed at this moment then
		 * keep auto-bkops enabled or else disable it.
		 */
		ufshcd_urgent_bkops(hba);

	hba->clk_gating.is_suspended = false;

	if (hba->clk_scaling.is_allowed)
		ufshcd_resume_clkscaling(hba);

	/* Schedule clock gating in case of no access to UFS device yet */
	ufshcd_release(hba);

	/* Enable Auto-Hibernate if configured */
	ufshcd_auto_hibern8_enable(hba);

	goto out;

set_old_link_state:
	ufshcd_link_state_transition(hba, old_link_state, 0);
vendor_suspend:
	ufshcd_vops_suspend(hba, pm_op);
disable_vreg:
	ufshcd_vreg_set_lpm(hba);
disable_irq_and_vops_clks:
	ufshcd_disable_irq(hba);
	if (hba->clk_scaling.is_allowed)
		ufshcd_suspend_clkscaling(hba);
	ufshcd_setup_clocks(hba, false);
out:
	hba->pm_op_in_progress = 0;
	return ret;
}

/**
 * ufshcd_system_suspend - system suspend routine
 * @hba: per adapter instance
 *
 * Check the description of ufshcd_suspend() function for more details.
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_system_suspend(struct ufs_hba *hba)
{
	int ret = 0;
	ktime_t start = ktime_get();

	if (!hba || !hba->is_powered)
		return 0;

	if ((ufs_get_pm_lvl_to_dev_pwr_mode(hba->spm_lvl) ==
	     hba->curr_dev_pwr_mode) &&
	    (ufs_get_pm_lvl_to_link_pwr_state(hba->spm_lvl) ==
	     hba->uic_link_state))
		goto out;

	if (pm_runtime_suspended(hba->dev)) {
		/*
		 * UFS device and/or UFS link low power states during runtime
		 * suspend seems to be different than what is expected during
		 * system suspend. Hence runtime resume the devic & link and
		 * let the system suspend low power states to take effect.
		 * TODO: If resume takes longer time, we might have optimize
		 * it in future by not resuming everything if possible.
		 */
		ret = ufshcd_runtime_resume(hba);
		if (ret)
			goto out;
	}

	ret = ufshcd_suspend(hba, UFS_SYSTEM_PM);
out:
	trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
		ktime_to_us(ktime_sub(ktime_get(), start)),
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	if (!ret)
		hba->is_sys_suspended = true;
	return ret;
}
EXPORT_SYMBOL(ufshcd_system_suspend);

/**
 * ufshcd_system_resume - system resume routine
 * @hba: per adapter instance
 *
 * Returns 0 for success and non-zero for failure
 */

int ufshcd_system_resume(struct ufs_hba *hba)
{
	int ret = 0;
	ktime_t start = ktime_get();

	if (!hba)
		return -EINVAL;

	if (!hba->is_powered || pm_runtime_suspended(hba->dev))
		/*
		 * Let the runtime resume take care of resuming
		 * if runtime suspended.
		 */
		goto out;
	else
		ret = ufshcd_resume(hba, UFS_SYSTEM_PM);
out:
	trace_ufshcd_system_resume(dev_name(hba->dev), ret,
		ktime_to_us(ktime_sub(ktime_get(), start)),
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	if (!ret)
		hba->is_sys_suspended = false;
	return ret;
}
EXPORT_SYMBOL(ufshcd_system_resume);

/**
 * ufshcd_runtime_suspend - runtime suspend routine
 * @hba: per adapter instance
 *
 * Check the description of ufshcd_suspend() function for more details.
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_runtime_suspend(struct ufs_hba *hba)
{
	int ret = 0;
	ktime_t start = ktime_get();

	if (!hba)
		return -EINVAL;

	if (!hba->is_powered)
		goto out;
	else
		ret = ufshcd_suspend(hba, UFS_RUNTIME_PM);
out:
	trace_ufshcd_runtime_suspend(dev_name(hba->dev), ret,
		ktime_to_us(ktime_sub(ktime_get(), start)),
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	return ret;
}
EXPORT_SYMBOL(ufshcd_runtime_suspend);

/**
 * ufshcd_runtime_resume - runtime resume routine
 * @hba: per adapter instance
 *
 * This function basically brings the UFS device, UniPro link and controller
 * to active state. Following operations are done in this function:
 *
 * 1. Turn on all the controller related clocks
 * 2. Bring the UniPro link out of Hibernate state
 * 3. If UFS device is in sleep state, turn ON VCC rail and bring the UFS device
 *    to active state.
 * 4. If auto-bkops is enabled on the device, disable it.
 *
 * So following would be the possible power state after this function return
 * successfully:
 *	S1: UFS device in Active state with VCC rail ON
 *	    UniPro link in Active state
 *	    All the UFS/UniPro controller clocks are ON
 *
 * Returns 0 for success and non-zero for failure
 */
int ufshcd_runtime_resume(struct ufs_hba *hba)
{
	int ret = 0;
	ktime_t start = ktime_get();

	if (!hba)
		return -EINVAL;

	if (!hba->is_powered)
		goto out;
	else
		ret = ufshcd_resume(hba, UFS_RUNTIME_PM);
out:
	trace_ufshcd_runtime_resume(dev_name(hba->dev), ret,
		ktime_to_us(ktime_sub(ktime_get(), start)),
		hba->curr_dev_pwr_mode, hba->uic_link_state);
	return ret;
}
EXPORT_SYMBOL(ufshcd_runtime_resume);

int ufshcd_runtime_idle(struct ufs_hba *hba)
{
	return 0;
}
EXPORT_SYMBOL(ufshcd_runtime_idle);

/**
 * ufshcd_shutdown - shutdown routine
 * @hba: per adapter instance
 *
 * This function would power off both UFS device and UFS link.
 *
 * Returns 0 always to allow force shutdown even in case of errors.
 */
int ufshcd_shutdown(struct ufs_hba *hba)
{
	int ret = 0;

	if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
		goto out;

	if (pm_runtime_suspended(hba->dev)) {
		ret = ufshcd_runtime_resume(hba);
		if (ret)
			goto out;
	}

	ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM);
out:
	if (ret)
		dev_err(hba->dev, "%s failed, err %d\n", __func__, ret);
	/* allow force shutdown even in case of errors */
	return 0;
}
EXPORT_SYMBOL(ufshcd_shutdown);

/**
 * ufshcd_remove - de-allocate SCSI host and host memory space
 *		data structure memory
 * @hba: per adapter instance
 */
void ufshcd_remove(struct ufs_hba *hba)
{
	ufs_bsg_remove(hba);
	ufs_sysfs_remove_nodes(hba->dev);
	scsi_remove_host(hba->host);
	/* disable interrupts */
	ufshcd_disable_intr(hba, hba->intr_mask);
	ufshcd_hba_stop(hba, true);

	ufshcd_exit_clk_scaling(hba);
	ufshcd_exit_clk_gating(hba);
	if (ufshcd_is_clkscaling_supported(hba))
		device_remove_file(hba->dev, &hba->clk_scaling.enable_attr);
	ufshcd_hba_exit(hba);
}
EXPORT_SYMBOL_GPL(ufshcd_remove);

/**
 * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
 * @hba: pointer to Host Bus Adapter (HBA)
 */
void ufshcd_dealloc_host(struct ufs_hba *hba)
{
	scsi_host_put(hba->host);
}
EXPORT_SYMBOL_GPL(ufshcd_dealloc_host);

/**
 * ufshcd_set_dma_mask - Set dma mask based on the controller
 *			 addressing capability
 * @hba: per adapter instance
 *
 * Returns 0 for success, non-zero for failure
 */
static int ufshcd_set_dma_mask(struct ufs_hba *hba)
{
	if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
		if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
			return 0;
	}
	return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
}

/**
 * ufshcd_alloc_host - allocate Host Bus Adapter (HBA)
 * @dev: pointer to device handle
 * @hba_handle: driver private handle
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
{
	struct Scsi_Host *host;
	struct ufs_hba *hba;
	int err = 0;

	if (!dev) {
		dev_err(dev,
		"Invalid memory reference for dev is NULL\n");
		err = -ENODEV;
		goto out_error;
	}

	host = scsi_host_alloc(&ufshcd_driver_template,
				sizeof(struct ufs_hba));
	if (!host) {
		dev_err(dev, "scsi_host_alloc failed\n");
		err = -ENOMEM;
		goto out_error;
	}
	hba = shost_priv(host);
	hba->host = host;
	hba->dev = dev;
	*hba_handle = hba;
	hba->dev_ref_clk_freq = REF_CLK_FREQ_INVAL;

	INIT_LIST_HEAD(&hba->clk_list_head);

out_error:
	return err;
}
EXPORT_SYMBOL(ufshcd_alloc_host);

/**
 * ufshcd_init - Driver initialization routine
 * @hba: per-adapter instance
 * @mmio_base: base register address
 * @irq: Interrupt line of device
 * Returns 0 on success, non-zero value on failure
 */
int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
{
	int err;
	struct Scsi_Host *host = hba->host;
	struct device *dev = hba->dev;

	if (!mmio_base) {
		dev_err(hba->dev,
		"Invalid memory reference for mmio_base is NULL\n");
		err = -ENODEV;
		goto out_error;
	}

	hba->mmio_base = mmio_base;
	hba->irq = irq;

	/* Set descriptor lengths to specification defaults */
	ufshcd_def_desc_sizes(hba);

	err = ufshcd_hba_init(hba);
	if (err)
		goto out_error;

	/* Read capabilities registers */
	ufshcd_hba_capabilities(hba);

	/* Get UFS version supported by the controller */
	hba->ufs_version = ufshcd_get_ufs_version(hba);

	if ((hba->ufs_version != UFSHCI_VERSION_10) &&
	    (hba->ufs_version != UFSHCI_VERSION_11) &&
	    (hba->ufs_version != UFSHCI_VERSION_20) &&
	    (hba->ufs_version != UFSHCI_VERSION_21))
		dev_err(hba->dev, "invalid UFS version 0x%x\n",
			hba->ufs_version);

	/* Get Interrupt bit mask per version */
	hba->intr_mask = ufshcd_get_intr_mask(hba);

	err = ufshcd_set_dma_mask(hba);
	if (err) {
		dev_err(hba->dev, "set dma mask failed\n");
		goto out_disable;
	}

	/* Allocate memory for host memory space */
	err = ufshcd_memory_alloc(hba);
	if (err) {
		dev_err(hba->dev, "Memory allocation failed\n");
		goto out_disable;
	}

	/* Configure LRB */
	ufshcd_host_memory_configure(hba);

	host->can_queue = hba->nutrs;
	host->cmd_per_lun = hba->nutrs;
	host->max_id = UFSHCD_MAX_ID;
	host->max_lun = UFS_MAX_LUNS;
	host->max_channel = UFSHCD_MAX_CHANNEL;
	host->unique_id = host->host_no;
	host->max_cmd_len = UFS_CDB_SIZE;

	hba->max_pwr_info.is_valid = false;

	/* Initailize wait queue for task management */
	init_waitqueue_head(&hba->tm_wq);
	init_waitqueue_head(&hba->tm_tag_wq);

	/* Initialize work queues */
	INIT_WORK(&hba->eh_work, ufshcd_err_handler);
	INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);

	/* Initialize UIC command mutex */
	mutex_init(&hba->uic_cmd_mutex);

	/* Initialize mutex for device management commands */
	mutex_init(&hba->dev_cmd.lock);

	init_rwsem(&hba->clk_scaling_lock);

	/* Initialize device management tag acquire wait queue */
	init_waitqueue_head(&hba->dev_cmd.tag_wq);

	ufshcd_init_clk_gating(hba);

	ufshcd_init_clk_scaling(hba);

	/*
	 * In order to avoid any spurious interrupt immediately after
	 * registering UFS controller interrupt handler, clear any pending UFS
	 * interrupt status and disable all the UFS interrupts.
	 */
	ufshcd_writel(hba, ufshcd_readl(hba, REG_INTERRUPT_STATUS),
		      REG_INTERRUPT_STATUS);
	ufshcd_writel(hba, 0, REG_INTERRUPT_ENABLE);
	/*
	 * Make sure that UFS interrupts are disabled and any pending interrupt
	 * status is cleared before registering UFS interrupt handler.
	 */
	mb();

	/* IRQ registration */
	err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba);
	if (err) {
		dev_err(hba->dev, "request irq failed\n");
		goto exit_gating;
	} else {
		hba->is_irq_enabled = true;
	}

	err = scsi_add_host(host, hba->dev);
	if (err) {
		dev_err(hba->dev, "scsi_add_host failed\n");
		goto exit_gating;
	}

	/* Host controller enable */
	err = ufshcd_hba_enable(hba);
	if (err) {
		dev_err(hba->dev, "Host controller enable failed\n");
		ufshcd_print_host_regs(hba);
		ufshcd_print_host_state(hba);
		goto out_remove_scsi_host;
	}

	/*
	 * Set the default power management level for runtime and system PM.
	 * Default power saving mode is to keep UFS link in Hibern8 state
	 * and UFS device in sleep state.
	 */
	hba->rpm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
						UFS_SLEEP_PWR_MODE,
						UIC_LINK_HIBERN8_STATE);
	hba->spm_lvl = ufs_get_desired_pm_lvl_for_dev_link_state(
						UFS_SLEEP_PWR_MODE,
						UIC_LINK_HIBERN8_STATE);

	/* Set the default auto-hiberate idle timer value to 150 ms */
	if (ufshcd_is_auto_hibern8_supported(hba) && !hba->ahit) {
		hba->ahit = FIELD_PREP(UFSHCI_AHIBERN8_TIMER_MASK, 150) |
			    FIELD_PREP(UFSHCI_AHIBERN8_SCALE_MASK, 3);
	}

	/* Hold auto suspend until async scan completes */
	pm_runtime_get_sync(dev);
	atomic_set(&hba->scsi_block_reqs_cnt, 0);
	/*
	 * We are assuming that device wasn't put in sleep/power-down
	 * state exclusively during the boot stage before kernel.
	 * This assumption helps avoid doing link startup twice during
	 * ufshcd_probe_hba().
	 */
	ufshcd_set_ufs_dev_active(hba);

	async_schedule(ufshcd_async_scan, hba);
	ufs_sysfs_add_nodes(hba->dev);

	return 0;

out_remove_scsi_host:
	scsi_remove_host(hba->host);
exit_gating:
	ufshcd_exit_clk_scaling(hba);
	ufshcd_exit_clk_gating(hba);
out_disable:
	hba->is_irq_enabled = false;
	ufshcd_hba_exit(hba);
out_error:
	return err;
}
EXPORT_SYMBOL_GPL(ufshcd_init);

MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
MODULE_DESCRIPTION("Generic UFS host controller driver Core");
MODULE_LICENSE("GPL");
MODULE_VERSION(UFSHCD_DRIVER_VERSION);