aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/omap2/displays/panel-taal.c
blob: 4f3988a4108215eba3a0e504a5aef2b3e6ba3d97 (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
/*
 * Taal DSI command mode panel
 *
 * Copyright (C) 2009 Nokia Corporation
 * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/*#define DEBUG*/

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/slab.h>

#include <plat/display.h>

/* DSI Virtual channel. Hardcoded for now. */
#define TCH 0

#define DCS_READ_NUM_ERRORS	0x05
#define DCS_READ_POWER_MODE	0x0a
#define DCS_READ_MADCTL		0x0b
#define DCS_READ_PIXEL_FORMAT	0x0c
#define DCS_RDDSDR		0x0f
#define DCS_SLEEP_IN		0x10
#define DCS_SLEEP_OUT		0x11
#define DCS_DISPLAY_OFF		0x28
#define DCS_DISPLAY_ON		0x29
#define DCS_COLUMN_ADDR		0x2a
#define DCS_PAGE_ADDR		0x2b
#define DCS_MEMORY_WRITE	0x2c
#define DCS_TEAR_OFF		0x34
#define DCS_TEAR_ON		0x35
#define DCS_MEM_ACC_CTRL	0x36
#define DCS_PIXEL_FORMAT	0x3a
#define DCS_BRIGHTNESS		0x51
#define DCS_CTRL_DISPLAY	0x53
#define DCS_WRITE_CABC		0x55
#define DCS_READ_CABC		0x56
#define DCS_GET_ID1		0xda
#define DCS_GET_ID2		0xdb
#define DCS_GET_ID3		0xdc

/* #define TAAL_USE_ESD_CHECK */
#define TAAL_ESD_CHECK_PERIOD	msecs_to_jiffies(5000)

static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable);

struct taal_data {
	struct backlight_device *bldev;

	unsigned long	hw_guard_end;	/* next value of jiffies when we can
					 * issue the next sleep in/out command
					 */
	unsigned long	hw_guard_wait;	/* max guard time in jiffies */

	struct omap_dss_device *dssdev;

	bool enabled;
	u8 rotate;
	bool mirror;

	bool te_enabled;
	bool use_ext_te;
	struct completion te_completion;

	bool use_dsi_bl;

	bool cabc_broken;
	unsigned cabc_mode;

	bool intro_printed;

	struct workqueue_struct *esd_wq;
	struct delayed_work esd_work;
};

static void taal_esd_work(struct work_struct *work);

static void hw_guard_start(struct taal_data *td, int guard_msec)
{
	td->hw_guard_wait = msecs_to_jiffies(guard_msec);
	td->hw_guard_end = jiffies + td->hw_guard_wait;
}

static void hw_guard_wait(struct taal_data *td)
{
	unsigned long wait = td->hw_guard_end - jiffies;

	if ((long)wait > 0 && wait <= td->hw_guard_wait) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(wait);
	}
}

static int taal_dcs_read_1(u8 dcs_cmd, u8 *data)
{
	int r;
	u8 buf[1];

	r = dsi_vc_dcs_read(TCH, dcs_cmd, buf, 1);

	if (r < 0)
		return r;

	*data = buf[0];

	return 0;
}

static int taal_dcs_write_0(u8 dcs_cmd)
{
	return dsi_vc_dcs_write(TCH, &dcs_cmd, 1);
}

static int taal_dcs_write_1(u8 dcs_cmd, u8 param)
{
	u8 buf[2];
	buf[0] = dcs_cmd;
	buf[1] = param;
	return dsi_vc_dcs_write(TCH, buf, 2);
}

static int taal_sleep_in(struct taal_data *td)

{
	u8 cmd;
	int r;

	hw_guard_wait(td);

	cmd = DCS_SLEEP_IN;
	r = dsi_vc_dcs_write_nosync(TCH, &cmd, 1);
	if (r)
		return r;

	hw_guard_start(td, 120);

	msleep(5);

	return 0;
}

static int taal_sleep_out(struct taal_data *td)
{
	int r;

	hw_guard_wait(td);

	r = taal_dcs_write_0(DCS_SLEEP_OUT);
	if (r)
		return r;

	hw_guard_start(td, 120);

	msleep(5);

	return 0;
}

static int taal_get_id(u8 *id1, u8 *id2, u8 *id3)
{
	int r;

	r = taal_dcs_read_1(DCS_GET_ID1, id1);
	if (r)
		return r;
	r = taal_dcs_read_1(DCS_GET_ID2, id2);
	if (r)
		return r;
	r = taal_dcs_read_1(DCS_GET_ID3, id3);
	if (r)
		return r;

	return 0;
}

static int taal_set_addr_mode(u8 rotate, bool mirror)
{
	int r;
	u8 mode;
	int b5, b6, b7;

	r = taal_dcs_read_1(DCS_READ_MADCTL, &mode);
	if (r)
		return r;

	switch (rotate) {
	default:
	case 0:
		b7 = 0;
		b6 = 0;
		b5 = 0;
		break;
	case 1:
		b7 = 0;
		b6 = 1;
		b5 = 1;
		break;
	case 2:
		b7 = 1;
		b6 = 1;
		b5 = 0;
		break;
	case 3:
		b7 = 1;
		b6 = 0;
		b5 = 1;
		break;
	}

	if (mirror)
		b6 = !b6;

	mode &= ~((1<<7) | (1<<6) | (1<<5));
	mode |= (b7 << 7) | (b6 << 6) | (b5 << 5);

	return taal_dcs_write_1(DCS_MEM_ACC_CTRL, mode);
}

static int taal_set_update_window(u16 x, u16 y, u16 w, u16 h)
{
	int r;
	u16 x1 = x;
	u16 x2 = x + w - 1;
	u16 y1 = y;
	u16 y2 = y + h - 1;

	u8 buf[5];
	buf[0] = DCS_COLUMN_ADDR;
	buf[1] = (x1 >> 8) & 0xff;
	buf[2] = (x1 >> 0) & 0xff;
	buf[3] = (x2 >> 8) & 0xff;
	buf[4] = (x2 >> 0) & 0xff;

	r = dsi_vc_dcs_write_nosync(TCH, buf, sizeof(buf));
	if (r)
		return r;

	buf[0] = DCS_PAGE_ADDR;
	buf[1] = (y1 >> 8) & 0xff;
	buf[2] = (y1 >> 0) & 0xff;
	buf[3] = (y2 >> 8) & 0xff;
	buf[4] = (y2 >> 0) & 0xff;

	r = dsi_vc_dcs_write_nosync(TCH, buf, sizeof(buf));
	if (r)
		return r;

	dsi_vc_send_bta_sync(TCH);

	return r;
}

static int taal_bl_update_status(struct backlight_device *dev)
{
	struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev);
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	int r;
	int level;

	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
			dev->props.power == FB_BLANK_UNBLANK)
		level = dev->props.brightness;
	else
		level = 0;

	dev_dbg(&dssdev->dev, "update brightness to %d\n", level);

	if (td->use_dsi_bl) {
		if (td->enabled) {
			dsi_bus_lock();
			r = taal_dcs_write_1(DCS_BRIGHTNESS, level);
			dsi_bus_unlock();
			if (r)
				return r;
		}
	} else {
		if (!dssdev->set_backlight)
			return -EINVAL;

		r = dssdev->set_backlight(dssdev, level);
		if (r)
			return r;
	}

	return 0;
}

static int taal_bl_get_intensity(struct backlight_device *dev)
{
	if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
			dev->props.power == FB_BLANK_UNBLANK)
		return dev->props.brightness;

	return 0;
}

static struct backlight_ops taal_bl_ops = {
	.get_brightness = taal_bl_get_intensity,
	.update_status  = taal_bl_update_status,
};

static void taal_get_timings(struct omap_dss_device *dssdev,
			struct omap_video_timings *timings)
{
	*timings = dssdev->panel.timings;
}

static void taal_get_resolution(struct omap_dss_device *dssdev,
		u16 *xres, u16 *yres)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);

	if (td->rotate == 0 || td->rotate == 2) {
		*xres = dssdev->panel.timings.x_res;
		*yres = dssdev->panel.timings.y_res;
	} else {
		*yres = dssdev->panel.timings.x_res;
		*xres = dssdev->panel.timings.y_res;
	}
}

static irqreturn_t taal_te_isr(int irq, void *data)
{
	struct omap_dss_device *dssdev = data;
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);

	complete_all(&td->te_completion);

	return IRQ_HANDLED;
}

static ssize_t taal_num_errors_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct omap_dss_device *dssdev = to_dss_device(dev);
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	u8 errors;
	int r;

	if (td->enabled) {
		dsi_bus_lock();
		r = taal_dcs_read_1(DCS_READ_NUM_ERRORS, &errors);
		dsi_bus_unlock();
	} else {
		r = -ENODEV;
	}

	if (r)
		return r;

	return snprintf(buf, PAGE_SIZE, "%d\n", errors);
}

static ssize_t taal_hw_revision_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct omap_dss_device *dssdev = to_dss_device(dev);
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	u8 id1, id2, id3;
	int r;

	if (td->enabled) {
		dsi_bus_lock();
		r = taal_get_id(&id1, &id2, &id3);
		dsi_bus_unlock();
	} else {
		r = -ENODEV;
	}

	if (r)
		return r;

	return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
}

static const char *cabc_modes[] = {
	"off",		/* used also always when CABC is not supported */
	"ui",
	"still-image",
	"moving-image",
};

static ssize_t show_cabc_mode(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct omap_dss_device *dssdev = to_dss_device(dev);
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	const char *mode_str;
	int mode;
	int len;

	mode = td->cabc_mode;

	mode_str = "unknown";
	if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
		mode_str = cabc_modes[mode];
	len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);

	return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
}

static ssize_t store_cabc_mode(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct omap_dss_device *dssdev = to_dss_device(dev);
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	int i;

	for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
		if (sysfs_streq(cabc_modes[i], buf))
			break;
	}

	if (i == ARRAY_SIZE(cabc_modes))
		return -EINVAL;

	if (td->enabled) {
		dsi_bus_lock();
		if (!td->cabc_broken)
			taal_dcs_write_1(DCS_WRITE_CABC, i);
		dsi_bus_unlock();
	}

	td->cabc_mode = i;

	return count;
}

static ssize_t show_cabc_available_modes(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	int len;
	int i;

	for (i = 0, len = 0;
	     len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
		len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
			i ? " " : "", cabc_modes[i],
			i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");

	return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
}

static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL);
static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL);
static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
		show_cabc_mode, store_cabc_mode);
static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
		show_cabc_available_modes, NULL);

static struct attribute *taal_attrs[] = {
	&dev_attr_num_dsi_errors.attr,
	&dev_attr_hw_revision.attr,
	&dev_attr_cabc_mode.attr,
	&dev_attr_cabc_available_modes.attr,
	NULL,
};

static struct attribute_group taal_attr_group = {
	.attrs = taal_attrs,
};

static int taal_probe(struct omap_dss_device *dssdev)
{
	struct backlight_properties props;
	struct taal_data *td;
	struct backlight_device *bldev;
	int r;

	const struct omap_video_timings taal_panel_timings = {
		.x_res		= 864,
		.y_res		= 480,
	};

	dev_dbg(&dssdev->dev, "probe\n");

	dssdev->panel.config = OMAP_DSS_LCD_TFT;
	dssdev->panel.timings = taal_panel_timings;
	dssdev->ctrl.pixel_size = 24;

	td = kzalloc(sizeof(*td), GFP_KERNEL);
	if (!td) {
		r = -ENOMEM;
		goto err0;
	}
	td->dssdev = dssdev;

	td->esd_wq = create_singlethread_workqueue("taal_esd");
	if (td->esd_wq == NULL) {
		dev_err(&dssdev->dev, "can't create ESD workqueue\n");
		r = -ENOMEM;
		goto err1;
	}
	INIT_DELAYED_WORK_DEFERRABLE(&td->esd_work, taal_esd_work);

	dev_set_drvdata(&dssdev->dev, td);

	/* if no platform set_backlight() defined, presume DSI backlight
	 * control */
	memset(&props, 0, sizeof(struct backlight_properties));
	if (!dssdev->set_backlight)
		td->use_dsi_bl = true;

	if (td->use_dsi_bl)
		props.max_brightness = 255;
	else
		props.max_brightness = 127;
	bldev = backlight_device_register("taal", &dssdev->dev, dssdev,
					  &taal_bl_ops, &props);
	if (IS_ERR(bldev)) {
		r = PTR_ERR(bldev);
		goto err2;
	}

	td->bldev = bldev;

	bldev->props.fb_blank = FB_BLANK_UNBLANK;
	bldev->props.power = FB_BLANK_UNBLANK;
	if (td->use_dsi_bl)
		bldev->props.brightness = 255;
	else
		bldev->props.brightness = 127;

	taal_bl_update_status(bldev);

	if (dssdev->phy.dsi.ext_te) {
		int gpio = dssdev->phy.dsi.ext_te_gpio;

		r = gpio_request(gpio, "taal irq");
		if (r) {
			dev_err(&dssdev->dev, "GPIO request failed\n");
			goto err3;
		}

		gpio_direction_input(gpio);

		r = request_irq(gpio_to_irq(gpio), taal_te_isr,
				IRQF_DISABLED | IRQF_TRIGGER_RISING,
				"taal vsync", dssdev);

		if (r) {
			dev_err(&dssdev->dev, "IRQ request failed\n");
			gpio_free(gpio);
			goto err3;
		}

		init_completion(&td->te_completion);

		td->use_ext_te = true;
	}

	r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group);
	if (r) {
		dev_err(&dssdev->dev, "failed to create sysfs files\n");
		goto err4;
	}

	return 0;
err4:
	if (td->use_ext_te) {
		int gpio = dssdev->phy.dsi.ext_te_gpio;
		free_irq(gpio_to_irq(gpio), dssdev);
		gpio_free(gpio);
	}
err3:
	backlight_device_unregister(bldev);
err2:
	cancel_delayed_work_sync(&td->esd_work);
	destroy_workqueue(td->esd_wq);
err1:
	kfree(td);
err0:
	return r;
}

static void taal_remove(struct omap_dss_device *dssdev)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	struct backlight_device *bldev;

	dev_dbg(&dssdev->dev, "remove\n");

	sysfs_remove_group(&dssdev->dev.kobj, &taal_attr_group);

	if (td->use_ext_te) {
		int gpio = dssdev->phy.dsi.ext_te_gpio;
		free_irq(gpio_to_irq(gpio), dssdev);
		gpio_free(gpio);
	}

	bldev = td->bldev;
	bldev->props.power = FB_BLANK_POWERDOWN;
	taal_bl_update_status(bldev);
	backlight_device_unregister(bldev);

	cancel_delayed_work_sync(&td->esd_work);
	destroy_workqueue(td->esd_wq);

	kfree(td);
}

static int taal_power_on(struct omap_dss_device *dssdev)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	u8 id1, id2, id3;
	int r;

	if (dssdev->platform_enable) {
		r = dssdev->platform_enable(dssdev);
		if (r)
			return r;
	}

	/* it seems we have to wait a bit until taal is ready */
	msleep(5);

	dsi_bus_lock();

	r = omapdss_dsi_display_enable(dssdev);
	if (r) {
		dev_err(&dssdev->dev, "failed to enable DSI\n");
		goto err0;
	}

	omapdss_dsi_vc_enable_hs(TCH, false);

	r = taal_sleep_out(td);
	if (r)
		goto err;

	r = taal_get_id(&id1, &id2, &id3);
	if (r)
		goto err;

	/* on early revisions CABC is broken */
	if (id2 == 0x00 || id2 == 0xff || id2 == 0x81)
		td->cabc_broken = true;

	taal_dcs_write_1(DCS_BRIGHTNESS, 0xff);
	taal_dcs_write_1(DCS_CTRL_DISPLAY, (1<<2) | (1<<5)); /* BL | BCTRL */

	taal_dcs_write_1(DCS_PIXEL_FORMAT, 0x7); /* 24bit/pixel */

	taal_set_addr_mode(td->rotate, td->mirror);
	if (!td->cabc_broken)
		taal_dcs_write_1(DCS_WRITE_CABC, td->cabc_mode);

	taal_dcs_write_0(DCS_DISPLAY_ON);

	r = _taal_enable_te(dssdev, td->te_enabled);
	if (r)
		goto err;

#ifdef TAAL_USE_ESD_CHECK
	queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
#endif

	td->enabled = 1;

	if (!td->intro_printed) {
		dev_info(&dssdev->dev, "revision %02x.%02x.%02x\n",
				id1, id2, id3);
		if (td->cabc_broken)
			dev_info(&dssdev->dev,
					"old Taal version, CABC disabled\n");
		td->intro_printed = true;
	}

	omapdss_dsi_vc_enable_hs(TCH, true);

	dsi_bus_unlock();

	return 0;
err:
	dsi_bus_unlock();

	omapdss_dsi_display_disable(dssdev);
err0:
	if (dssdev->platform_disable)
		dssdev->platform_disable(dssdev);

	return r;
}

static void taal_power_off(struct omap_dss_device *dssdev)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);

	dsi_bus_lock();

	cancel_delayed_work(&td->esd_work);

	taal_dcs_write_0(DCS_DISPLAY_OFF);
	taal_sleep_in(td);

	/* wait a bit so that the message goes through */
	msleep(10);

	omapdss_dsi_display_disable(dssdev);

	if (dssdev->platform_disable)
		dssdev->platform_disable(dssdev);

	td->enabled = 0;

	dsi_bus_unlock();
}

static int taal_enable(struct omap_dss_device *dssdev)
{
	int r;
	dev_dbg(&dssdev->dev, "enable\n");

	if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)
		return -EINVAL;

	r = taal_power_on(dssdev);
	if (r)
		return r;

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return r;
}

static void taal_disable(struct omap_dss_device *dssdev)
{
	dev_dbg(&dssdev->dev, "disable\n");

	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
		taal_power_off(dssdev);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static int taal_suspend(struct omap_dss_device *dssdev)
{
	dev_dbg(&dssdev->dev, "suspend\n");

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
		return -EINVAL;

	taal_power_off(dssdev);
	dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;

	return 0;
}

static int taal_resume(struct omap_dss_device *dssdev)
{
	int r;
	dev_dbg(&dssdev->dev, "resume\n");

	if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
		return -EINVAL;

	r = taal_power_on(dssdev);
	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
	return r;
}

static void taal_framedone_cb(int err, void *data)
{
	struct omap_dss_device *dssdev = data;
	dev_dbg(&dssdev->dev, "framedone, err %d\n", err);
	dsi_bus_unlock();
}

static int taal_update(struct omap_dss_device *dssdev,
				    u16 x, u16 y, u16 w, u16 h)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	int r;

	dev_dbg(&dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);

	dsi_bus_lock();

	if (!td->enabled) {
		r = 0;
		goto err;
	}

	r = omap_dsi_prepare_update(dssdev, &x, &y, &w, &h);
	if (r)
		goto err;

	r = taal_set_update_window(x, y, w, h);
	if (r)
		goto err;

	r = omap_dsi_update(dssdev, TCH, x, y, w, h,
			taal_framedone_cb, dssdev);
	if (r)
		goto err;

	/* note: no bus_unlock here. unlock is in framedone_cb */
	return 0;
err:
	dsi_bus_unlock();
	return r;
}

static int taal_sync(struct omap_dss_device *dssdev)
{
	dev_dbg(&dssdev->dev, "sync\n");

	dsi_bus_lock();
	dsi_bus_unlock();

	dev_dbg(&dssdev->dev, "sync done\n");

	return 0;
}

static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	int r;

	td->te_enabled = enable;

	if (enable)
		r = taal_dcs_write_1(DCS_TEAR_ON, 0);
	else
		r = taal_dcs_write_0(DCS_TEAR_OFF);

	omapdss_dsi_enable_te(dssdev, enable);

	/* XXX for some reason, DSI TE breaks if we don't wait here.
	 * Panel bug? Needs more studying */
	msleep(100);

	return r;
}

static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
{
	int r;

	dsi_bus_lock();

	r = _taal_enable_te(dssdev, enable);

	dsi_bus_unlock();

	return r;
}

static int taal_get_te(struct omap_dss_device *dssdev)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	return td->te_enabled;
}

static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	int r;

	dev_dbg(&dssdev->dev, "rotate %d\n", rotate);

	dsi_bus_lock();

	if (td->enabled) {
		r = taal_set_addr_mode(rotate, td->mirror);
		if (r)
			goto err;
	}

	td->rotate = rotate;

	dsi_bus_unlock();
	return 0;
err:
	dsi_bus_unlock();
	return r;
}

static u8 taal_get_rotate(struct omap_dss_device *dssdev)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	return td->rotate;
}

static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	int r;

	dev_dbg(&dssdev->dev, "mirror %d\n", enable);

	dsi_bus_lock();
	if (td->enabled) {
		r = taal_set_addr_mode(td->rotate, enable);
		if (r)
			goto err;
	}

	td->mirror = enable;

	dsi_bus_unlock();
	return 0;
err:
	dsi_bus_unlock();
	return r;
}

static bool taal_get_mirror(struct omap_dss_device *dssdev)
{
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);
	return td->mirror;
}

static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
{
	u8 id1, id2, id3;
	int r;

	dsi_bus_lock();

	r = taal_dcs_read_1(DCS_GET_ID1, &id1);
	if (r)
		goto err;
	r = taal_dcs_read_1(DCS_GET_ID2, &id2);
	if (r)
		goto err;
	r = taal_dcs_read_1(DCS_GET_ID3, &id3);
	if (r)
		goto err;

	dsi_bus_unlock();
	return 0;
err:
	dsi_bus_unlock();
	return r;
}

static int taal_memory_read(struct omap_dss_device *dssdev,
		void *buf, size_t size,
		u16 x, u16 y, u16 w, u16 h)
{
	int r;
	int first = 1;
	int plen;
	unsigned buf_used = 0;
	struct taal_data *td = dev_get_drvdata(&dssdev->dev);

	if (!td->enabled)
		return -ENODEV;

	if (size < w * h * 3)
		return -ENOMEM;

	size = min(w * h * 3,
			dssdev->panel.timings.x_res *
			dssdev->panel.timings.y_res * 3);

	dsi_bus_lock();

	/* plen 1 or 2 goes into short packet. until checksum error is fixed,
	 * use short packets. plen 32 works, but bigger packets seem to cause
	 * an error. */
	if (size % 2)
		plen = 1;
	else
		plen = 2;

	taal_set_update_window(x, y, w, h);

	r = dsi_vc_set_max_rx_packet_size(TCH, plen);
	if (r)
		goto err0;

	while (buf_used < size) {
		u8 dcs_cmd = first ? 0x2e : 0x3e;
		first = 0;

		r = dsi_vc_dcs_read(TCH, dcs_cmd,
				buf + buf_used, size - buf_used);

		if (r < 0) {
			dev_err(&dssdev->dev, "read error\n");
			goto err;
		}

		buf_used += r;

		if (r < plen) {
			dev_err(&dssdev->dev, "short read\n");
			break;
		}

		if (signal_pending(current)) {
			dev_err(&dssdev->dev, "signal pending, "
					"aborting memory read\n");
			r = -ERESTARTSYS;
			goto err;
		}
	}

	r = buf_used;

err:
	dsi_vc_set_max_rx_packet_size(TCH, 1);
err0:
	dsi_bus_unlock();
	return r;
}

static void taal_esd_work(struct work_struct *work)
{
	struct taal_data *td = container_of(work, struct taal_data,
			esd_work.work);
	struct omap_dss_device *dssdev = td->dssdev;
	u8 state1, state2;
	int r;

	if (!td->enabled)
		return;

	dsi_bus_lock();

	r = taal_dcs_read_1(DCS_RDDSDR, &state1);
	if (r) {
		dev_err(&dssdev->dev, "failed to read Taal status\n");
		goto err;
	}

	/* Run self diagnostics */
	r = taal_sleep_out(td);
	if (r) {
		dev_err(&dssdev->dev, "failed to run Taal self-diagnostics\n");
		goto err;
	}

	r = taal_dcs_read_1(DCS_RDDSDR, &state2);
	if (r) {
		dev_err(&dssdev->dev, "failed to read Taal status\n");
		goto err;
	}

	/* Each sleep out command will trigger a self diagnostic and flip
	 * Bit6 if the test passes.
	 */
	if (!((state1 ^ state2) & (1 << 6))) {
		dev_err(&dssdev->dev, "LCD self diagnostics failed\n");
		goto err;
	}
	/* Self-diagnostics result is also shown on TE GPIO line. We need
	 * to re-enable TE after self diagnostics */
	if (td->use_ext_te && td->te_enabled) {
		r = taal_dcs_write_1(DCS_TEAR_ON, 0);
		if (r)
			goto err;
	}

	dsi_bus_unlock();

	queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);

	return;
err:
	dev_err(&dssdev->dev, "performing LCD reset\n");

	taal_disable(dssdev);
	taal_enable(dssdev);

	dsi_bus_unlock();

	queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
}

static int taal_set_update_mode(struct omap_dss_device *dssdev,
		enum omap_dss_update_mode mode)
{
	if (mode != OMAP_DSS_UPDATE_MANUAL)
		return -EINVAL;
	return 0;
}

static enum omap_dss_update_mode taal_get_update_mode(
		struct omap_dss_device *dssdev)
{
	return OMAP_DSS_UPDATE_MANUAL;
}

static struct omap_dss_driver taal_driver = {
	.probe		= taal_probe,
	.remove		= taal_remove,

	.enable		= taal_enable,
	.disable	= taal_disable,
	.suspend	= taal_suspend,
	.resume		= taal_resume,

	.set_update_mode = taal_set_update_mode,
	.get_update_mode = taal_get_update_mode,

	.update		= taal_update,
	.sync		= taal_sync,

	.get_resolution	= taal_get_resolution,
	.get_recommended_bpp = omapdss_default_get_recommended_bpp,

	.enable_te	= taal_enable_te,
	.get_te		= taal_get_te,

	.set_rotate	= taal_rotate,
	.get_rotate	= taal_get_rotate,
	.set_mirror	= taal_mirror,
	.get_mirror	= taal_get_mirror,
	.run_test	= taal_run_test,
	.memory_read	= taal_memory_read,

	.get_timings	= taal_get_timings,

	.driver         = {
		.name   = "taal",
		.owner  = THIS_MODULE,
	},
};

static int __init taal_init(void)
{
	omap_dss_register_driver(&taal_driver);

	return 0;
}

static void __exit taal_exit(void)
{
	omap_dss_unregister_driver(&taal_driver);
}

module_init(taal_init);
module_exit(taal_exit);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
MODULE_DESCRIPTION("Taal Driver");
MODULE_LICENSE("GPL");