linux-kernel - Re: [PATCH v2 1/3] gpiolib: acpi: Add a helper for programming debounce

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Message-ID: <3ec49306-a21b-4f2a-b224-994f323148ab@kernel.org>
Date: Wed, 25 Jun 2025 20:58:05 +0200
From: Hans de Goede <hansg@...nel.org>
To: Mario Limonciello <superm1@...nel.org>,
 Mika Westerberg <westeri@...nel.org>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski
 <brgl@...ev.pl>, Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: "open list:GPIO ACPI SUPPORT" <linux-gpio@...r.kernel.org>,
 "open list:GPIO ACPI SUPPORT" <linux-acpi@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>,
 "open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)..."
 <linux-input@...r.kernel.org>, Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v2 1/3] gpiolib: acpi: Add a helper for programming
 debounce

Hi,

On 25-Jun-25 8:13 PM, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
> 
> Debounce is programmed in two places and considered non-fatal in one of
> them. Introduce a helper for programming debounce and show a warning
> when failing to program.  This is a difference in behavior for the call
> in acpi_dev_gpio_irq_wake_get_by().
> 
> Cc: Hans de Goede <hansg@...nel.org>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hansg@...nel.org>

Regards,

Hans



> ---
>  drivers/gpio/gpiolib-acpi-core.c | 24 +++++++++++++-----------
>  1 file changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib-acpi-core.c b/drivers/gpio/gpiolib-acpi-core.c
> index 12b24a717e43f..1895e45bd9f16 100644
> --- a/drivers/gpio/gpiolib-acpi-core.c
> +++ b/drivers/gpio/gpiolib-acpi-core.c
> @@ -291,6 +291,17 @@ acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
>  	return GPIOD_ASIS;
>  }
>  
> +static void acpi_set_debounce_timeout(struct gpio_desc *desc, unsigned int timeout)
> +{
> +	int ret;
> +
> +	/* ACPI uses hundredths of milliseconds units */
> +	ret = gpio_set_debounce_timeout(desc, timeout * 10);
> +	if (ret)
> +		dev_warn(&desc->gdev->dev,
> +			 "Failed to set debounce-timeout: %d\n", ret);
> +}
> +
>  static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
>  						struct acpi_resource_gpio *agpio,
>  						unsigned int index,
> @@ -300,18 +311,12 @@ static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
>  	enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
>  	unsigned int pin = agpio->pin_table[index];
>  	struct gpio_desc *desc;
> -	int ret;
>  
>  	desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
>  	if (IS_ERR(desc))
>  		return desc;
>  
> -	/* ACPI uses hundredths of milliseconds units */
> -	ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
> -	if (ret)
> -		dev_warn(chip->parent,
> -			 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
> -			 pin, ret);
> +	acpi_set_debounce_timeout(desc, agpio->debounce_timeout);
>  
>  	return desc;
>  }
> @@ -1025,10 +1030,7 @@ int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *con_id,
>  			if (ret < 0)
>  				return ret;
>  
> -			/* ACPI uses hundredths of milliseconds units */
> -			ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
> -			if (ret)
> -				return ret;
> +			acpi_set_debounce_timeout(desc, info.debounce);
>  
>  			irq_flags = acpi_dev_get_irq_type(info.triggering,
>  							  info.polarity);