lkml.org 
[lkml]   [2015]   [Aug]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] rtc: s5m: fix to update ctrl register
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@samsung.com>
> Cc: <stable@vger.kernel.org> # 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


\
 
 \ /
  Last update: 2015-08-24 09:41    [W:0.033 / U:0.124 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site