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authorYauhen Kharuzhy <jekhor@gmail.com>2012-01-10 15:10:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 16:30:52 -0800
commit7287be1d0ac8c82999b67c2a33517c6ec9cfdbe7 (patch)
tree7ed79d428bec700c2288c83cf3d685f87aa7019a
parentb43c1ea4d622b6951377de92edfb219d893e23ef (diff)
drivers/rtc/rtc-mxc.c: fix setting time for MX1 SoC
There is no way to track year in the i.MX1 RTC: Days Counter register is 9-bit wide only. Attempt to save date after 1970-01-01 plus 512 days causes endless loop in mxc_rtc_set_mmss(). Fix this by resetting year to 1970. [akpm@linux-foundation.org: use conventional comment layout] Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com> Cc: Daniel Mack <daniel@caiaq.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/rtc/rtc-mxc.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index 39e41fbdf08..11b7b614fc8 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -290,6 +290,17 @@ static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm)
*/
static int mxc_rtc_set_mmss(struct device *dev, unsigned long time)
{
+ /*
+ * TTC_DAYR register is 9-bit in MX1 SoC, save time and day of year only
+ */
+ if (cpu_is_mx1()) {
+ struct rtc_time tm;
+
+ rtc_time_to_tm(time, &tm);
+ tm.tm_year = 70;
+ rtc_tm_to_time(&tm, &time);
+ }
+
/* Avoid roll-over from reading the different registers */
do {
set_alarm_or_time(dev, MXC_RTC_TIME, time);