linux-kernel - Re: [PATCH v1] extcon: int3496: Ignore incorrect IoRestriction for ID pin

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Date:   Tue, 27 Feb 2018 12:59:41 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        linux-kernel@...r.kernel.org
Cc:     Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v1] extcon: int3496: Ignore incorrect IoRestriction for
 ID pin

Hi,

On 2018년 02월 27일 04:34, Andy Shevchenko wrote:
> The commit 70216fd937fe introduced a workaround for incorrect

You better to specify the commit id and patch name as following:
commit 70216fd937fe -> commit 70216fd937fe ("extcon: int3496: Set the id pin to direction-input if necessary")

> IoRestriction mode in ACPI table.

> 
> Now, when GPIO ACPI library does it in generic way, just set

I recommend that you specify clearly which patch you mention
about GPIO ACPI library.

> an appropriate quirk flag instead.
> 
> Cc: Hans de Goede <hdegoede@...hat.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/extcon/extcon-intel-int3496.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
> index 191e99f06a9a..acaccb128fc4 100644
> --- a/drivers/extcon/extcon-intel-int3496.c
> +++ b/drivers/extcon/extcon-intel-int3496.c
> @@ -50,7 +50,11 @@ static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, fal
>  static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };
>  
>  static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {
> -	{ "id-gpios", &id_gpios, 1 },
> +	/*
> +	 * Some platforms have a bug in ACPI GPIO description making IRQ
> +	 * GPIO to be output only. Ask the GPIO core to ignore this limit.
> +	 */
> +	{ "id-gpios", &id_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION },
>  	{ "vbus-gpios", &vbus_gpios, 1 },
>  	{ "mux-gpios", &mux_gpios, 1 },
>  	{ },
> @@ -112,9 +116,6 @@ static int int3496_probe(struct platform_device *pdev)
>  		ret = PTR_ERR(data->gpio_usb_id);
>  		dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
>  		return ret;
> -	} else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) {
> -		dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n");
> -		gpiod_direction_input(data->gpio_usb_id);
>  	}
>  
>  	data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics