linux-kernel - Re: [PATCH] extcon: intel-cht-wc: Also set direction and drv flags for V5 boost GPIO

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Date:   Mon, 19 Feb 2018 18:53:35 +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] extcon: intel-cht-wc: Also set direction and drv flags
 for V5 boost GPIO

Hi,

On 2018년 02월 15일 16:24, Hans de Goede wrote:
> Sometimes (firmware bug?) the V5 boost GPIO is not configured as output
> by the BIOS, leading to the 5V boost convertor being permanently on,
> 
> Explicitly set the direction and drv flags rather then inheriting them
> from the firmware to fix this.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

You need to add fixes tag and send stable mailing list.

> ---
>  drivers/extcon/extcon-intel-cht-wc.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
> index 7c4bc8c44c3f..b7e9ea377d70 100644
> --- a/drivers/extcon/extcon-intel-cht-wc.c
> +++ b/drivers/extcon/extcon-intel-cht-wc.c
> @@ -66,6 +66,8 @@
>  
>  #define CHT_WC_VBUS_GPIO_CTLO		0x6e2d
>  #define CHT_WC_VBUS_GPIO_CTLO_OUTPUT	BIT(0)
> +#define CHT_WC_VBUS_GPIO_CTLO_DRV_OD	BIT(4)
> +#define CHT_WC_VBUS_GPIO_CTLO_DIR_OUT	BIT(5)
>  
>  enum cht_wc_usb_id {
>  	USB_ID_OTG,
> @@ -183,14 +185,15 @@ static void cht_wc_extcon_set_5v_boost(struct cht_wc_extcon_data *ext,
>  {
>  	int ret, val;
>  
> -	val = enable ? CHT_WC_VBUS_GPIO_CTLO_OUTPUT : 0;
> -
>  	/*
>  	 * The 5V boost converter is enabled through a gpio on the PMIC, since
>  	 * there currently is no gpio driver we access the gpio reg directly.
>  	 */
> -	ret = regmap_update_bits(ext->regmap, CHT_WC_VBUS_GPIO_CTLO,
> -				 CHT_WC_VBUS_GPIO_CTLO_OUTPUT, val);
> +	val = CHT_WC_VBUS_GPIO_CTLO_DRV_OD | CHT_WC_VBUS_GPIO_CTLO_DIR_OUT;
> +	if (enable)
> +		val |= CHT_WC_VBUS_GPIO_CTLO_OUTPUT;
> +
> +	ret = regmap_write(ext->regmap, CHT_WC_VBUS_GPIO_CTLO, val);
>  	if (ret)
>  		dev_err(ext->dev, "Error writing Vbus GPIO CTLO: %d\n", ret);
>  }
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics