linux-kernel - Re: [PATCH] rtc: s5m: fix to update ctrl register

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Message-id: <55D67D14.9060809@samsung.com>
Date:	Fri, 21 Aug 2015 10:21:24 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	rtc-linux@...glegroups.com, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	a.zummo@...ertech.it, sbkim73@...sung.com
Subject: Re: [PATCH] rtc: s5m: fix to update ctrl register

On 21.08.2015 10:00, Joonyoung Shim wrote:
> On 08/21/2015 09:44 AM, Krzysztof Kozlowski wrote:
>> On 21.08.2015 08:15, Alexandre Belloni wrote:
>>> Hi,
>>>
>>> On 13/08/2015 at 17:49:24 +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 updated.
>>>>
>>>> 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.
>>>>
>>>
>>> >From what I understood, I should expect a v2 of tihat patch also setting
>>> RUDR, is that right? OR would you prefer that I apply that one and then
>>> fix RUDR in a following patch?
>>
>> Right, I would expect that as well... or a comment if this is not needed.
>>
> 
> Hmm, the driver only writes control register now, so i don't feel the
> need of patch setting RUDR for control register.

Yes, you're right. There is only regmap_write() (not
remap_update_bits()) so your patch is completely fine. Thanks for
explanation.

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof

> 
>> Best regards,
>> Krzysztof
>>
>>
>>>
>>>> Signed-off-by: Joonyoung Shim <jy0922.shim@...sung.com>
>>>> Cc: <stable@...r.kernel.org>
>>>
>>> can you update the stable tag with the kernel version introducing the
>>> issue?
> 
> Sure, i think it should be v3.16.
> 
>>>
>>>> ---
>>>>  drivers/rtc/rtc-s5m.c | 12 ++++++++++++
>>>>  1 file changed, 12 insertions(+)
>>>
>>>> diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
>>>> index 8c70d78..03828bb 100644
>>>> --- a/drivers/rtc/rtc-s5m.c
>>>> +++ b/drivers/rtc/rtc-s5m.c
>>>> @@ -635,6 +635,18 @@ static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
>>>>  	case S2MPS13X:
>>>>  		data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
>>>>  		ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
>>>> +		if (ret < 0)
>>>> +			break;
>>>> +
>>>> +		ret = regmap_update_bits(info->regmap,
>>>> +				info->regs->rtc_udr_update,
>>>> +				info->regs->rtc_udr_mask,
>>>> +				info->regs->rtc_udr_mask);
>>>
>>> Very small indentation issue here, it should be aligned with the open
>>> parenthesis.
> 
> OK, i will.
> 
> Thanks.
> 

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