MA-23194 Revert "watchdog: imx_sc_wdt: Don't disable WDT in suspend"

The SCU does not handle the WDT state, leaving parts of the suspend and
resume process unprotected if the WDT is not explicitly disabled in the
driver. This can cause unwanted system resets during suspend.

By reverting this change, we ensure that the WDT is properly disabled
during suspend and avoid unexpected resets caused by the WDT timing out.

This reverts commit b972bad.

Signed-off-by: Zhipeng Wang <[email protected]>
Change-Id: Ib58f8d42f889978cc2559fba7fc6421e5a076485

drivers/watchdog/imx_sc_wdt.c

@@ -214,6 +214,29 @@ 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 */ }
@@ -225,6 +248,7 @@ 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);