watchdog: imx7ulp_wdt: init wdog when it was active

Paired with suspend, we can only init wdog again when it was active
and ping it once to avoid the watchdog timeout after it resumed.

Signed-off-by: Jason Liu <[email protected]>
Signed-off-by: Alice Guo <[email protected]>
Reviewed-by: Ye Li <[email protected]>
Reviewed-by: Jacky Bai <[email protected]>
Tested-by: Jacky Bai <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: Jason Liu

drivers/watchdog/imx7ulp_wdt.c

@@ -136,13 +136,6 @@ static int imx7ulp_wdt_enable(struct watchdog_device *wdog, bool enable)
 	return ret;
 }
 
-static bool imx7ulp_wdt_is_enabled(void __iomem *base)
-{
-	u32 val = readl(base + WDOG_CS);
-
-	return val & WDOG_CS_EN;
-}
-
 static int imx7ulp_wdt_ping(struct watchdog_device *wdog)
 {
 	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);
@@ -382,11 +375,11 @@ static int __maybe_unused imx7ulp_wdt_resume_noirq(struct device *dev)
 	if (ret)
 		return ret;
 
-	if (imx7ulp_wdt_is_enabled(imx7ulp_wdt->base))
+	if (watchdog_active(&imx7ulp_wdt->wdd)) {
 		imx7ulp_wdt_init(imx7ulp_wdt, timeout);
-
-	if (watchdog_active(&imx7ulp_wdt->wdd))
 		imx7ulp_wdt_start(&imx7ulp_wdt->wdd);
+		imx7ulp_wdt_ping(&imx7ulp_wdt->wdd);
+	}
 
 	return 0;
 }