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

[Joonyoung Shim]

On 08/17/2015 11:00 AM, Krzysztof Kozlowski wrote:
> On 17.08.2015 10:47, Joonyoung Shim wrote:
>> Hi,
>>
>> On 08/13/2015 07:02 PM, Krzysztof Kozlowski wrote:
>>> W dniu 13.08.2015 o 17:49, Joonyoung Shim pisze:
>>>> According to datasheet, the S2MPS13X and S2MPS14X should update write
>>>> buffer via setting WUDR bit to high after ctrl register is updated.
>>>
>>> Hi,
>>>
>>> I cannot find this information in S2MPS14 datasheet. On which page is it?
>>>
>>
>> I got below information from S2MPS14_Data Sheet_REV0.1 document.
>>
>> 5.2.2.3 RTC_UPDATE
>> ...
>>
>> NOTE: 
>> 1.  For write Time Registers (0x00, 0x04~0x0A) & Alarm 0&1 Registers 
>> (0x0B~0x18), set WUDR bit to high.
> 
> Right, I have too but it does not say anything about control register.
> It mentions only time, alarm 0 and alarm 1 registers, not control.
> 

Address 0x00 is RTC_CTRL, so i don't know what you say.

>>
>>>
>>>>
>>>> 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.
>>>
>>> Two questions here:
>>> 1. Earlier you mentioned S2MPS1[34], now Odroid XU3 which has S2MPS11.
>>> Are you sure that this applies to all of them (S2MPS11, S2MPS13 and
>>> S2MP14)? There are some minor differences between them so I would not be
>>> surprised if only some of them required this action.
>>>
>>
>> I'm not sure about that because i don't have S2MPS11 datasheet. I just
>> got the information that S2MPS11 also use S2MPS14 rtc from sec-core mfd
>> driver,
> 
> Yeah, I added it. But these RTC modules are slightly different,
> especially S2MPS14, so you cannot assume that they are the same after
> looking at mainline code.
> 

OK, could you check this issue from different things?

Thanks.

>>
>> static const struct mfd_cell s2mps11_devs[] = {                                                                       
>>         {                                                                                                             
>>                 .name = "s2mps11-pmic",                                                                               
>>         }, {                                                                                                          
>>                 .name = "s2mps14-rtc",                                                                                
>>         }, {                                                                                                          
>>                 .name = "s2mps11-clk",                                                                                
>>                 .of_compatible = "samsung,s2mps11-clk",                                                               
>>         }                                                                                                             
>> };
>>
>>> 2. The driver operates in 24-hour omode. Actually it sets the 24-hour
>>> mode just before your new regmap_update_bits() call. What do you mean by
>>> 12-hour mode?
>>>
>>
>> RTC_CTRL register value is 0 until write buffer is updated, so it is
>> used to 12-hour mode.
> 
> I mean what do you have in mind by saying:
> "... and hour format is used to 12 hour mode in Odroid-XU3 board."
> The hour format is set by driver to 24h mode.
> 
> 
>>
>>>> Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
>>>> Cc: <stable@xxxxxxxxxxxxxxx>
>>>
>>> Thanks for putting a cc-stable tag. How far this should be ported? If
>>> this is needed only for S2MPS11 then v4.1. If all of them then probably
>>> for earlier version?
>>>
>>
>> If find exact version, i think it will be a version after below commit
>> was applied.
>>
>> The commit 0c5deb1ea92f("rtc: s5m: add support for S2MPS14 RTC")
>>
>> $ git name-rev 0c5deb1ea92f
>> 0c5deb1ea92f tags/v3.16-rc1~53^2~1
> 
> Hmmm... I am not against the patch (especially that it matches source
> code of SM-G900H with S2MPS11) but I have doubts about affected
> chipsets. My Odroid (probably because of bootloader), S2MPS13 and
> S2MPS14 do not need it. This confuses me...
> 
> Best regards,
> Krzysztof
> 
>>
>> Thanks.
>>
>>> Best regards,
>>> Krzysztof
>>>
>>>> ---
>>>>  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);
>>>> +		if (ret < 0)
>>>> +			break;
>>>> +
>>>> +		ret = s5m8767_wait_for_udr_update(info);
>>>> +
>>>>  		break;
>>>>  
>>>>  	default:
>>>>
>>>
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>>
>>
> 
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