5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jonas Blixt <jonas.blixt@xxxxxxxx>
[ Upstream commit 2d9d6d300fb0a4ae4431bb308027ac9385746d42 ]
Parts of the suspend and resume chain is left unprotected if we disable
the WDT here.
>From experiments we can see that the SCU disables and re-enables the WDT
when we enter and leave suspend to ram. By not touching the WDT here we
are protected by the WDT all the way to the SCU.
Signed-off-by: Jonas Blixt <jonas.blixt@xxxxxxxx>
CC: Anson Huang <anson.huang@xxxxxxx>
Fixes: 986857acbc9a ("watchdog: imx_sc: Add i.MX system controller watchdog support")
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240801121845.1465765-1-jonas.blixt@xxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/watchdog/imx_sc_wdt.c | 24 ------------------------
1 file changed, 24 deletions(-)
diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
index 8ac021748d160..79649b0e89e47 100644
--- a/drivers/watchdog/imx_sc_wdt.c
+++ b/drivers/watchdog/imx_sc_wdt.c
@@ -213,29 +213,6 @@ static int imx_sc_wdt_probe(struct platform_device *pdev)
return devm_watchdog_register_device(dev, wdog);
}
-static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
-{
- struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
-
- if (watchdog_active(&imx_sc_wdd->wdd))
- imx_sc_wdt_stop(&imx_sc_wdd->wdd);
-
- return 0;
-}
-
-static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
-{
- struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev);
-
- if (watchdog_active(&imx_sc_wdd->wdd))
- imx_sc_wdt_start(&imx_sc_wdd->wdd);
-
- return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
- imx_sc_wdt_suspend, imx_sc_wdt_resume);
-
static const struct of_device_id imx_sc_wdt_dt_ids[] = {
{ .compatible = "fsl,imx-sc-wdt", },
{ /* sentinel */ }
@@ -247,7 +224,6 @@ static struct platform_driver imx_sc_wdt_driver = {
.driver = {
.name = "imx-sc-wdt",
.of_match_table = imx_sc_wdt_dt_ids,
- .pm = &imx_sc_wdt_pm_ops,
},
};
module_platform_driver(imx_sc_wdt_driver);
--
2.43.0
