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platform/x86: portwell-ec: Add suspend/resume support for watchdog

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Portwell EC does not disable the watchdog during suspend. To avoid unwanted
resets, this patch adds suspend and resume callbacks (pwec_suspend() and
pwec_resume()) to the driver.

The watchdog is stopped in pwec_suspend() and restarted in pwec_resume() if
it was active before suspend.

Signed-off-by: Yen-Chi Huang <jesse.huang@portwell.com.tw>
Link: https://lore.kernel.org/r/c9cfe602-c279-4aa4-9932-76f47f26556c@portwell.com.tw
[ij: removed extra "3"]
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Yen-Chi Huang
2025-08-28 14:52:54 +03:00
committed by Ilpo Järvinen
parent 30359c239b
commit 54cf445175
1 changed files with 20 additions and 0 deletions
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drivers/platform/x86/portwell-ec.c
+20
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@@ -30,6 +30,7 @@
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/sizes.h>
#include <linux/string.h>
#include <linux/watchdog.h>
@@ -246,9 +247,28 @@ static int pwec_probe(struct platform_device *pdev)
return 0;
}
static int pwec_suspend(struct device *dev)
{
if (watchdog_active(&ec_wdt_dev))
return pwec_wdt_stop(&ec_wdt_dev);
return 0;
}
static int pwec_resume(struct device *dev)
{
if (watchdog_active(&ec_wdt_dev))
return pwec_wdt_start(&ec_wdt_dev);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(pwec_dev_pm_ops, pwec_suspend, pwec_resume);
static struct platform_driver pwec_driver = {
.driver = {
.name = "portwell-ec",
.pm = pm_sleep_ptr(&pwec_dev_pm_ops),
},
.probe = pwec_probe,
};