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authorJoonyoung Shim <jy0922.shim@samsung.com>2015-08-21 18:43:41 +0900
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-09-05 19:37:19 +0200
commitff02c0444b83201ff76cc49deccac8cf2bffc7bc (patch)
tree9af628a2ac99d4ce12e4bb8d57760599d331a191 /arch/arm/boot
parent11143c19eb57a8aee4335e57b21f2897b9fff294 (diff)
rtc: s5m: fix to update ctrl register
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 vendor kernel. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Cc: <stable@vger.kernel.org> # v3.16 Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Tested-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'arch/arm/boot')
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