watchdog: w83627hf_wdt: Add early_disable module parameter

Add early_disable module parameter to match functionality previously
available in the w83697hf_wdt driver.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/w83627hf_wdt.c

@@ -64,6 +64,10 @@ MODULE_PARM_DESC(nowayout,
 		"Watchdog cannot be stopped once started (default="
 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
+static int early_disable;
+module_param(early_disable, int, 0);
+MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)");
+
 /*
  *	Kernel methods.
  */
@@ -208,9 +212,14 @@ static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
 
 	t = superio_inb(cr_wdt_timeout);
 	if (t != 0) {
-		pr_info("Watchdog already running. Resetting timeout to %d sec\n",
-			wdog->timeout);
-		superio_outb(cr_wdt_timeout, wdog->timeout);
+		if (early_disable) {
+			pr_warn("Stopping previously enabled watchdog until userland kicks in\n");
+			superio_outb(cr_wdt_timeout, 0);
+		} else {
+			pr_info("Watchdog already running. Resetting timeout to %d sec\n",
+				wdog->timeout);
+			superio_outb(cr_wdt_timeout, wdog->timeout);
+		}
 	}
 
 	/* set second mode & disable keyboard turning off watchdog */