linux-kernel - Re: [PATCH] extcon: max77693: Fix a bug occured at changing ADC debounce time.

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Date:	Wed, 03 Sep 2014 15:39:02 +0900
From:	jonghwa3.lee@...sung.com
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	linux-kernel@...r.kernel.org, myungjoo.ham@...sung.com,
	r.baldyga@...sung.com
Subject: Re: [PATCH] extcon: max77693: Fix a bug occured at changing ADC
 debounce time.

On 2014년 09월 03일 14:55, Chanwoo Choi wrote:

> On 09/03/2014 02:50 PM, Jonghwa Lee wrote:
>> When it writes some value other than 0 to BTLDset and JIGset, muic device
>> will be reset automatically. And it happens during updating ADC debounce time,
>> because it shares same register. To update ADC debounce time without reset,
>> set value only to ADCDbset and 0 to BTLDset and JIGset.
>>
>> Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
>> ---
>>  drivers/extcon/extcon-max77693.c |   11 ++++++++---
>>  1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
>> index 77460f2..661a3bb 100644
>> --- a/drivers/extcon/extcon-max77693.c
>> +++ b/drivers/extcon/extcon-max77693.c
>> @@ -255,10 +255,15 @@ static int max77693_muic_set_debounce_time(struct max77693_muic_info *info,
>>  	case ADC_DEBOUNCE_TIME_10MS:
>>  	case ADC_DEBOUNCE_TIME_25MS:
>>  	case ADC_DEBOUNCE_TIME_38_62MS:
>> -		ret = regmap_update_bits(info->max77693->regmap_muic,
>> +		/*
>> +		 * Don't touch BTLDset, JIGset when you want to change adc
>> +		 * debounce time. BTLDset, JIGset reflects actual pin status
>> +		 * and are not configurable.
>> +		 */
>> +		ret = regmap_write_bits(info->max77693->regmap_muic,
>>  					  MAX77693_MUIC_REG_CTRL3,
>> -					  CONTROL3_ADCDBSET_MASK,
>> -					  time << CONTROL3_ADCDBSET_SHIFT);
>> +					  (CONTROL3_ADCDBSET_MASK &
>> +					  time << CONTROL3_ADCDBSET_SHIFT));
> 
> Do you make this patch on extcon-next branch?
> 
> The max77693_muic_set_debounce_time() of extcon-max77693.c
> use regmap_update_bits instead of regmap_write_bits as following:


This patch intends to use 'regmap_write_bits()' not 'regmap_update_bits()'.
With using regmap_update_bits(), it would writes some value to BTLDset and
JIGset then muic device will loose current state.

Thanks,
Jonghwa

> 
> 	switch (time) {
> 	case ADC_DEBOUNCE_TIME_5MS:
> 	case ADC_DEBOUNCE_TIME_10MS:
> 	case ADC_DEBOUNCE_TIME_25MS:
> 	case ADC_DEBOUNCE_TIME_38_62MS:
> 		ret = regmap_update_bits(info->max77693->regmap_muic,
> 					  MAX77693_MUIC_REG_CTRL3,
> 					  CONTROL3_ADCDBSET_MASK,
> 					  time << CONTROL3_ADCDBSET_SHIFT);
> 		if (ret) {
> 			dev_err(info->dev, "failed to set ADC debounce time\n");
> 			return ret;
> 		}
> 
> 
> Thanks,
> Chanwoo Choi
> 
> 
> 


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