linux-kernel - Re: [PATCH v3] extcon: max77693: Fix a bug occured at changing ADC debounce time.

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Date:	Mon, 22 Sep 2014 16:22:03 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Jonghwa Lee <jonghwa3.lee@...sung.com>
Cc:	linux-kernel@...r.kernel.org, myungjoo.ham@...sung.com,
	r.baldyga@...sung.com
Subject: Re: [PATCH v3] extcon: max77693: Fix a bug occured at changing ADC
 debounce time.

On 09/17/2014 12:58 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>
> ---
> Changes:
> v3:	- Fix typo (regmap_write_bits -> regmap_write)
> v2:	- Fix comments.
> 
>  drivers/extcon/extcon-max77693.c |   13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
> index 77460f2..132540e 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,
> -					  MAX77693_MUIC_REG_CTRL3,
> -					  CONTROL3_ADCDBSET_MASK,
> -					  time << CONTROL3_ADCDBSET_SHIFT);
> +		/*
> +		 * Don't touch BTLDset, JIGset when you want to change adc
> +		 * debounce time. If it writes other than 0 to BTLDset, JIGset
> +		 * muic device will be reset and loose current state.
> +		 */
> +		ret = regmap_write(info->max77693->regmap_muic,
> +				  MAX77693_MUIC_REG_CTRL3,
> +				  (CONTROL3_ADCDBSET_MASK &
> +				  time << CONTROL3_ADCDBSET_SHIFT));

I think that masking operation is not necessary. I drop this operation and apply it.

>  		if (ret) {
>  			dev_err(info->dev, "failed to set ADC debounce time\n");
>  			return ret;
> 

Applied.

Thanks,
Chanwoo Choi
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