linux-kernel - Re: [PATCH v2] watchdog: apple: Deactivate on suspend

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Message-ID: <c6149f04-4cf6-8dcc-3aca-d926f49a34d7@roeck-us.net>
Date:   Sun, 22 Oct 2023 09:48:07 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     j@...nau.net, Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] watchdog: apple: Deactivate on suspend

On 10/15/23 23:58, Janne Grunau via B4 Relay wrote:
> From: Janne Grunau <j@...nau.net>
> 
> The watchdog remains active after putting the system into suspend. Add
> PM callbacks to deactivate the watchdog on suspend an re-activate it on
> resume.
> 
> Signed-off-by: Janne Grunau <j@...nau.net>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> Changes in v2:
> - use DEFINE_SIMPLE_DEV_PM_OPS
> - Link to v1: https://lore.kernel.org/r/20230930-apple-watchdog-suspend-v1-1-1998c0be9fd7@jannau.net
> ---
>   drivers/watchdog/apple_wdt.c | 25 +++++++++++++++++++++++++
>   1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/watchdog/apple_wdt.c b/drivers/watchdog/apple_wdt.c
> index eddeb0fede89..d4f739932f0b 100644
> --- a/drivers/watchdog/apple_wdt.c
> +++ b/drivers/watchdog/apple_wdt.c
> @@ -173,6 +173,8 @@ static int apple_wdt_probe(struct platform_device *pdev)
>   	if (!wdt->clk_rate)
>   		return -EINVAL;
>   
> +	platform_set_drvdata(pdev, wdt);
> +
>   	wdt->wdd.ops = &apple_wdt_ops;
>   	wdt->wdd.info = &apple_wdt_info;
>   	wdt->wdd.max_timeout = U32_MAX / wdt->clk_rate;
> @@ -190,6 +192,28 @@ static int apple_wdt_probe(struct platform_device *pdev)
>   	return devm_watchdog_register_device(dev, &wdt->wdd);
>   }
>   
> +static int apple_wdt_resume(struct device *dev)
> +{
> +	struct apple_wdt *wdt = dev_get_drvdata(dev);
> +
> +	if (watchdog_active(&wdt->wdd) || watchdog_hw_running(&wdt->wdd))
> +		apple_wdt_start(&wdt->wdd);
> +
> +	return 0;
> +}
> +
> +static int apple_wdt_suspend(struct device *dev)
> +{
> +	struct apple_wdt *wdt = dev_get_drvdata(dev);
> +
> +	if (watchdog_active(&wdt->wdd) || watchdog_hw_running(&wdt->wdd))
> +		apple_wdt_stop(&wdt->wdd);
> +
> +	return 0;
> +}
> +
> +static DEFINE_SIMPLE_DEV_PM_OPS(apple_wdt_pm_ops, apple_wdt_suspend, apple_wdt_resume);
> +
>   static const struct of_device_id apple_wdt_of_match[] = {
>   	{ .compatible = "apple,wdt" },
>   	{},
> @@ -200,6 +224,7 @@ static struct platform_driver apple_wdt_driver = {
>   	.driver = {
>   		.name = "apple-watchdog",
>   		.of_match_table = apple_wdt_of_match,
> +		.pm = pm_sleep_ptr(&apple_wdt_pm_ops),
>   	},
>   	.probe = apple_wdt_probe,
>   };
> 
> ---
> base-commit: 0bb80ecc33a8fb5a682236443c1e740d5c917d1d
> change-id: 20230930-apple-watchdog-suspend-7f73831130fb
> 
> Best regards,