[PATCH] watchdog: imx_sc_wdt: Don't disable WDT in suspend
From: Jonas Blixt <hidden>
Date: 2024-08-01 12:34:07
Also in:
imx, linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
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.
CC: Anson Huang <redacted>
Fixes: 986857acbc9a ("watchdog: imx_sc: Add i.MX system controller watchdog support")
Signed-off-by: Jonas Blixt <redacted>
---
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 e51fe1b78518..d73076b686d8 100644
--- a/drivers/watchdog/imx_sc_wdt.c
+++ b/drivers/watchdog/imx_sc_wdt.c@@ -216,29 +216,6 @@ 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 */ }
@@ -250,7 +227,6 @@ 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);
--
2.34.1