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

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Message-Id: <20230930-apple-watchdog-suspend-v1-1-1998c0be9fd7@jannau.net>
Date:   Sat, 30 Sep 2023 10:19:26 +0200
From:   Janne Grunau via B4 Relay <devnull+j.jannau.net@...nel.org>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Janne Grunau <j@...nau.net>
Subject: [PATCH] watchdog: apple: Deactivate on suspend

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>
---
 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..2167e0ba705e 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 __maybe_unused 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 __maybe_unused 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 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,
-- 
Janne Grunau <j@...nau.net>