linux-kernel - Re: [PATCH v2 1/2] Input: axp20x-pek - Respect userspace wakeup configuration

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Date:   Wed, 15 Jan 2020 11:50:08 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Samuel Holland <samuel@...lland.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 1/2] Input: axp20x-pek - Respect userspace wakeup
 configuration

Hi,

On 15-01-2020 06:12, Samuel Holland wrote:
> Unlike most other power button drivers, this driver unconditionally
> enables its wakeup IRQ. It should be using device_may_wakeup() to
> respect the userspace configuration of wakeup sources.
> 
> Because the AXP20x MFD device uses regmap-irq, the AXP20x PEK IRQs are
> nested off of regmap-irq's threaded interrupt handler. The device core
> ignores such interrupts, so to actually disable wakeup, we must
> explicitly disable all non-wakeup interrupts during suspend.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

Patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> ---
>   drivers/input/misc/axp20x-pek.c | 37 ++++++++++++++++++++++++++++++++-
>   1 file changed, 36 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/misc/axp20x-pek.c b/drivers/input/misc/axp20x-pek.c
> index 17c1cca74498..0ace3fe3d7dc 100644
> --- a/drivers/input/misc/axp20x-pek.c
> +++ b/drivers/input/misc/axp20x-pek.c
> @@ -280,7 +280,7 @@ static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
>   	}
>   
>   	if (axp20x_pek->axp20x->variant == AXP288_ID)
> -		enable_irq_wake(axp20x_pek->irq_dbr);
> +		device_init_wakeup(&pdev->dev, true);
>   
>   	return 0;
>   }
> @@ -352,6 +352,40 @@ static int axp20x_pek_probe(struct platform_device *pdev)
>   	return 0;
>   }
>   
> +static int __maybe_unused axp20x_pek_suspend(struct device *dev)
> +{
> +	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> +
> +	/*
> +	 * As nested threaded IRQs are not automatically disabled during
> +	 * suspend, we must explicitly disable non-wakeup IRQs.
> +	 */
> +	if (device_may_wakeup(dev)) {
> +		enable_irq_wake(axp20x_pek->irq_dbf);
> +		enable_irq_wake(axp20x_pek->irq_dbr);
> +	} else {
> +		disable_irq(axp20x_pek->irq_dbf);
> +		disable_irq(axp20x_pek->irq_dbr);
> +	}
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused axp20x_pek_resume(struct device *dev)
> +{
> +	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> +
> +	if (device_may_wakeup(dev)) {
> +		disable_irq_wake(axp20x_pek->irq_dbf);
> +		disable_irq_wake(axp20x_pek->irq_dbr);
> +	} else {
> +		enable_irq(axp20x_pek->irq_dbf);
> +		enable_irq(axp20x_pek->irq_dbr);
> +	}
> +
> +	return 0;
> +}
> +
>   static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
>   {
>   	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
> @@ -371,6 +405,7 @@ static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
>   }
>   
>   static const struct dev_pm_ops axp20x_pek_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
>   #ifdef CONFIG_PM_SLEEP
>   	.resume_noirq = axp20x_pek_resume_noirq,
>   #endif
>