LWMON5: POST RTC fix
Modify the RTC API to provide one a status for the time reported by
the rtc_get() function:
0 - a reliable time is guaranteed,
< 0 - a reliable time isn't guaranteed (power fault, clock issues,
and so on).
The RTC chip drivers are responsible for providing this info if the
corresponding chip supports such functionality. If not - always
report that the time is reliable.
The POST RTC test was modified to detect the RTC faults utilizing
this new rtc_get() feature.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
diff --git a/post/drivers/rtc.c b/post/drivers/rtc.c
index 7d4f9b8..e3da5e6 100644
--- a/post/drivers/rtc.c
+++ b/post/drivers/rtc.c
@@ -28,6 +28,8 @@
*
* The Real Time Clock (RTC) operation is verified by this test.
* The following features are verified:
+ * o) RTC Power Fault
+ * This is verified by analyzing the rtc_get() return status.
* o) Time uniformity
* This is verified by reading RTC in polling within
* a short period of time.
@@ -96,6 +98,10 @@
unsigned int ynl = 1999;
unsigned int yl = 2000;
unsigned int skipped = 0;
+ int reliable;
+
+ /* Time reliability */
+ reliable = rtc_get (&svtm);
/* Time uniformity */
if (rtc_post_skip (&diff) != 0) {
@@ -176,6 +182,15 @@
}
rtc_post_restore (&svtm, skipped);
+ /* If come here, then RTC operates correcty, check the correctness
+ * of the time it reports.
+ */
+ if (reliable < 0) {
+ post_log ("RTC Time is not reliable! Power fault? \n");
+
+ return -1;
+ }
+
return 0;
}