linux-kernel - Re: [PATCH] PM: runtime: Extend support for wakeirq for force

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Message-ID: <086c0102b772bd86c23c4fdcb5b145854d76042d.camel@mediatek.com>
Date:   Thu, 9 Jun 2022 11:16:17 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        <linux-pm@...r.kernel.org>
CC:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Tony Lindgren <tony@...mide.com>,
        Axe Yang <axe.yang@...iatek.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: runtime: Extend support for wakeirq for
 force_suspend|resume

On Wed, 2022-06-08 at 17:31 +0200, Ulf Hansson wrote:
> A driver that makes use of pm_runtime_force_suspend|resume() to
> support
> system suspend/resume, currently needs to manage the wakeirq support
> itself. To avoid the boilerplate code in the driver's system
> suspend/resume
> callbacks in particular, let's extend
> pm_runtime_force_suspend|resume() to
> deal with the wakeirq.
> 
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> 
> Note that, the reason behind this patch came up while discussing an
> MMC patch
> for a Mediatek MMC host driver [1].
> 
> Kind regards
> Ulf Hansson
> 
> [1]
> https://lkml.org/lkml/2022/6/8/813
> 
> ---
>  drivers/base/power/runtime.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/base/power/runtime.c
> b/drivers/base/power/runtime.c
> index 676dc72d912d..445a724cbded 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -1876,10 +1876,13 @@ int pm_runtime_force_suspend(struct device
> *dev)
>  
>  	callback = RPM_GET_CALLBACK(dev, runtime_suspend);
>  
> +	dev_pm_enable_wake_irq_check(dev, true);
>  	ret = callback ? callback(dev) : 0;
>  	if (ret)
>  		goto err;
>  
> +	dev_pm_enable_wake_irq_complete(dev);
> +
>  	/*
>  	 * If the device can stay in suspend after the system-wide
> transition
>  	 * to the working state that will follow, drop the children
> counter of
> @@ -1896,6 +1899,7 @@ int pm_runtime_force_suspend(struct device
> *dev)
>  	return 0;
>  
>  err:
> +	dev_pm_disable_wake_irq_check(dev, true);
>  	pm_runtime_enable(dev);
>  	return ret;
>  }
> @@ -1929,9 +1933,11 @@ int pm_runtime_force_resume(struct device
> *dev)
>  
>  	callback = RPM_GET_CALLBACK(dev, runtime_resume);
>  
> +	dev_pm_disable_wake_irq_check(dev, false);
>  	ret = callback ? callback(dev) : 0;
>  	if (ret) {
>  		pm_runtime_set_suspended(dev);
> +		dev_pm_enable_wake_irq_check(dev, false);
>  		goto out;
>  	}
>  
Reviewed-by Chunfeng Yun <chunfeng.yun@...iatek.com>