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References: <20231016-apple-watchdog-suspend-v2-1-7ffff8042dbc@jannau.net>
In-Reply-To: <20231016-apple-watchdog-suspend-v2-1-7ffff8042dbc@jannau.net>
From:   Neal Gompa <neal@gompa.dev>
Date:   Tue, 17 Oct 2023 10:38:51 -0400
Message-ID: <CAEg-Je-UMr7ZzSjPraHqkAneoHgBKsis7jfzcYt0vcgvUADi4Q@mail.gmail.com>
Subject: Re: [PATCH v2] watchdog: apple: Deactivate on suspend
To:     j@jannau.net
Cc:     Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>,
        Alyssa Rosenzweig <alyssa@rosenzweig.io>,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        Guenter Roeck <linux@roeck-us.net>, asahi@lists.linux.dev,
        linux-arm-kernel@lists.infradead.org,
        linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org
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On Mon, Oct 16, 2023 at 2:58 AM Janne Grunau via B4 Relay
<devnull+j.jannau.net@kernel.org> wrote:
>
> From: Janne Grunau <j@jannau.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@jannau.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
>

Reviewed-by: Neal Gompa <neal@gompa.dev>


-- 
真実はいつも一つ！/ Always, there's only one truth!