From 54cf44517550d53960d2fc5f85cf55d668c8889d Mon Sep 17 00:00:00 2001 From: Yen-Chi Huang Date: Thu, 28 Aug 2025 13:31:17 +0800 Subject: [PATCH] platform/x86: portwell-ec: Add suspend/resume support for watchdog MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://lore.kernel.org/r/c9cfe602-c279-4aa4-9932-76f47f26556c@portwell.com.tw [ij: removed extra "3"] Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen --- drivers/platform/x86/portwell-ec.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/platform/x86/portwell-ec.c b/drivers/platform/x86/portwell-ec.c index 322f296e93153..d2e91d5c3b3a6 100644 --- a/drivers/platform/x86/portwell-ec.c +++ b/drivers/platform/x86/portwell-ec.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -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, }; -- 2.47.3