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watchdog: apple: Deactivate on suspend

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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>
Reviewed-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231016-apple-watchdog-suspend-v2-1-7ffff8042dbc@jannau.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Janne Grunau 2023-10-16 08:58:01 +02:00 committed by Wim Van Sebroeck
parent 49bd08b361
commit 78ca4d6902
1 changed files with 25 additions and 0 deletions
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25
drivers/watchdog/apple_wdt.c
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@ -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,
};