linux-kernel - Re: [PATCH 2/6] extcon: arizona: Additional settings to improve accuracy of HP detect

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Date:	Fri, 11 Sep 2015 17:16:20 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	lee.jones@...aro.org
Cc:	myungjoo.ham@...sung.com, sameo@...ux.intel.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH 2/6] extcon: arizona: Additional settings to improve
 accuracy of HP detect

On 2015년 09월 10일 20:41, Charles Keepax wrote:
> If the TST_CAP_SEL bits aren't set correctly on wm5110/8280 there will
> be a 100k load along side the headphones, which will affect the accurary
> towards the very top of the detection range. This patch sets those bits.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> ---
>  drivers/extcon/extcon-arizona.c |   19 +++++++++++++++++--
>  1 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
> index b48fb29..7bfaacd 100644
> --- a/drivers/extcon/extcon-arizona.c
> +++ b/drivers/extcon/extcon-arizona.c
> @@ -43,6 +43,9 @@
>  #define ARIZONA_MICD_CLAMP_MODE_JDL_GP5H 0x9
>  #define ARIZONA_MICD_CLAMP_MODE_JDH_GP5H 0xb
>  
> +#define ARIZONA_TST_CAP_DEFAULT 0x3
> +#define ARIZONA_TST_CAP_CLAMP   0x1
> +
>  #define ARIZONA_HPDET_MAX 10000
>  
>  #define HPDET_DEBOUNCE 500
> @@ -147,6 +150,7 @@ static void arizona_extcon_hp_clamp(struct arizona_extcon_info *info,
>  {
>  	struct arizona *arizona = info->arizona;
>  	unsigned int mask = 0, val = 0;
> +	unsigned int cap_sel = 0;
>  	int ret;
>  
>  	switch (arizona->type) {
> @@ -154,10 +158,21 @@ static void arizona_extcon_hp_clamp(struct arizona_extcon_info *info,
>  	case WM8280:
>  		mask = ARIZONA_HP1L_SHRTO | ARIZONA_HP1L_FLWR |
>  		       ARIZONA_HP1L_SHRTI;
> -		if (clamp)
> +		if (clamp) {
>  			val = ARIZONA_HP1L_SHRTO;
> -		else
> +			cap_sel = ARIZONA_TST_CAP_CLAMP;
> +		} else {
>  			val = ARIZONA_HP1L_FLWR | ARIZONA_HP1L_SHRTI;
> +			cap_sel = ARIZONA_TST_CAP_DEFAULT;
> +		}
> +
> +		ret = regmap_update_bits(arizona->regmap,
> +					 ARIZONA_HP_TEST_CTRL_1,
> +					 ARIZONA_HP1_TST_CAP_SEL_MASK,
> +					 cap_sel);
> +		if (ret != 0)
> +			dev_warn(arizona->dev,
> +				 "Failed to set TST_CAP_SEL: %d\n", ret);
>  		break;
>  	default:
>  		mask = ARIZONA_RMV_SHRT_HP1L;
> 

Acked-by: Chanwoo Choi <cw00.choi@...sung.com>

Thanks,
Chanwoo Choi
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