watchdog: imx2_wdt: Improve power management support.

Improve power management operations(suspend and resume) as part of
dev_pm_ops for IMX2 watchdog driver.

If PM will be supported, please make sure that the wdev->clk
could disable the watchdog's counter input clock source or can
mask watchdog's reset request to the core.

If watchdog is still used by consumers and resumes from deep
sleep state, we need to restart the watchdog again without
enabling the timer.

If watchdog been has started --> stopped by the consumers and
resumes from non-deep sleep state, then start the timer again.

If watchdog has been started --> stopped by the consumers and
resumes from deep sleep state, will do nothing. The watchdog
will be restarted by consumers next time to be used.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/imx2_wdt.c

@@ -327,18 +327,21 @@ static void imx2_wdt_shutdown(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-/* Disable watchdog if it is active during suspend */
+/* Disable watchdog if it is active or non-active but still running */
 static int imx2_wdt_suspend(struct device *dev)
 {
 	struct watchdog_device *wdog = dev_get_drvdata(dev);
 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
 
-	imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
-	imx2_wdt_ping(wdog);
+	/* The watchdog IP block is running */
+	if (imx2_wdt_is_running(wdev)) {
+		imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
+		imx2_wdt_ping(wdog);
 
-	/* Watchdog has been stopped but IP block is still running */
-	if (!watchdog_active(wdog) && imx2_wdt_is_running(wdev))
-		del_timer_sync(&wdev->timer);
+		/* The watchdog is not active */
+		if (!watchdog_active(wdog))
+			del_timer_sync(&wdev->timer);
+	}
 
 	clk_disable_unprepare(wdev->clk);
 
@@ -354,15 +357,25 @@ static int imx2_wdt_resume(struct device *dev)
 	clk_prepare_enable(wdev->clk);
 
 	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
-		/* Resumes from deep sleep we need restart
-		 * the watchdog again.
+		/*
+		 * If the watchdog is still active and resumes
+		 * from deep sleep state, need to restart the
+		 * watchdog again.
 		 */
 		imx2_wdt_setup(wdog);
 		imx2_wdt_set_timeout(wdog, wdog->timeout);
 		imx2_wdt_ping(wdog);
 	} else if (imx2_wdt_is_running(wdev)) {
+		/* Resuming from non-deep sleep state. */
+		imx2_wdt_set_timeout(wdog, wdog->timeout);
 		imx2_wdt_ping(wdog);
-		mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);
+		/*
+		 * But the watchdog is not active, then start
+		 * the timer again.
+		 */
+		if (!watchdog_active(wdog))
+			mod_timer(&wdev->timer,
+				  jiffies + wdog->timeout * HZ / 2);
 	}
 
 	return 0;