On 21/08/2015 at 18:43:41 +0900, Joonyoung Shim wrote : > According to datasheet, the S2MPS13X and S2MPS14X should update write > buffer via setting WUDR bit to high after ctrl register is written. > > If not, ALARM interrupt of rtc-s5m doesn't happen first time when i use > tools/testing/selftests/timers/rtctest.c test program and hour format is > used to 12 hour mode in Odroid-XU3 board. > > One more issue is the RTC doesn't keep time on Odroid-XU3 board when i > turn on board after power off even if RTC battery is connected. It can > be solved as setting WUDR & RUDR bits to high at the same time after > RTC_CTRL register is written. It's same with condition of only writing > ALARM registers, so this is for only S2MPS14 and we should set WUDR & > A_UDR bits to high on S2MPS13. > > I can't find any reasonable description about this like fix from > datasheet, but can find similar codes from rtc driver source of > hardkernel kernel and vender kernel. > > Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> # v3.16 > --- > Changelog for v2: > - update commit description and code to fix time keeping problem > - update the stable tag with the kernel version > > drivers/rtc/rtc-s5m.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > Applied, thanks. I fixed the small typo. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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