linux-kernel - Re: [PATCH 4/8] extcon: axp288: Fix possibly reporting 2 cables in state true

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Date:   Mon, 19 Dec 2016 15:27:47 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/8] extcon: axp288: Fix possibly reporting 2 cables in
 state true

Hi Hans,

This patch looks good to me. But I have one comment
when setting the previous_cable in probe().

On 2016년 12월 19일 09:13, Hans de Goede wrote:
> When the charger type changes from e.g. SDP to CDP, without Vbus being
> seen as low in between axp288_handle_chrg_det_event would set the state
> for the new cable type to true, without clearing the state of the
> previous cable type to false.
> 
> This commit fixes this and also gets rid of the function local static
> cable variable, properly storing all drv state in the axp288_extcon_info
> struct.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/extcon/extcon-axp288.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
> index 43b3637..ded0bd9 100644
> --- a/drivers/extcon/extcon-axp288.c
> +++ b/drivers/extcon/extcon-axp288.c
> @@ -115,6 +115,7 @@ struct axp288_extcon_info {
>  	int irq[EXTCON_IRQ_END];
>  	struct extcon_dev *edev;
>  	struct notifier_block extcon_nb;
> +	unsigned int previous_cable;
>  };
>  
>  /* Power up/down reason string array */
> @@ -154,9 +155,9 @@ static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
>  
>  static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
>  {
> -	static unsigned int cable;
>  	int ret, stat, cfg, pwr_stat;
>  	u8 chrg_type;
> +	unsigned int cable = info->previous_cable;
>  	bool vbus_attach = false;
>  
>  	ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
> @@ -212,7 +213,11 @@ static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
>  			vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
>  					: EXTCON_GPIO_MUX_SEL_PMIC);
>  
> -	extcon_set_state_sync(info->edev, cable, vbus_attach);
> +	extcon_set_state_sync(info->edev, info->previous_cable, false);
> +	if (vbus_attach) {
> +		extcon_set_state_sync(info->edev, cable, vbus_attach);
> +		info->previous_cable = cable;
> +	}
>  
>  	return 0;
>  
> @@ -263,6 +268,7 @@ static int axp288_extcon_probe(struct platform_device *pdev)
>  	info->dev = &pdev->dev;
>  	info->regmap = axp20x->regmap;
>  	info->regmap_irqc = axp20x->regmap_irqc;
> +	info->previous_cable = axp288_extcon_cables[0];

I think that you better to use "EXTCON_NONE" instead of
"axp288_extcon_cables[0]" as following:
	info->previous_cable = EXTCON_NONE;


>  	if (pdata)
>  		info->gpio_mux_cntl = pdata->gpio_mux_cntl;
>  
> 

-- 
Regards,
Chanwoo Choi