| Message ID | 20230930-apple-watchdog-suspend-v1-1-1998c0be9fd7@jannau.net (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | watchdog: apple: Deactivate on suspend | expand |
On Sat, Sep 30, 2023 at 10:19:26AM +0200, Janne Grunau via B4 Relay 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> > --- > 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); Comments above that define say /* Deprecated. Use DEFINE_SIMPLE_DEV_PM_OPS() instead. */ and with that the __maybe_unused is no longer necessary. > + > 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@jannau.net> >
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, };