watchdog: sama5d4: fix WDD value to be always set to max

commit 8632944841d41a36d77dd1fa88d4201b5291100f upstream.

WDD value must be always set to max (0xFFF) otherwise the hardware
block will reset the board on the first ping of the watchdog.
Signed-off-by: NEugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/watchdog/sama5d4_wdt.c

@@ -111,9 +111,7 @@ static int sama5d4_wdt_set_timeout(struct watchdog_device *wdd,
 	u32 value = WDT_SEC2TICKS(timeout);
 
 	wdt->mr &= ~AT91_WDT_WDV;
-	wdt->mr &= ~AT91_WDT_WDD;
 	wdt->mr |= AT91_WDT_SET_WDV(value);
-	wdt->mr |= AT91_WDT_SET_WDD(value);
 
 	/*
 	 * WDDIS has to be 0 when updating WDD/WDV. The datasheet states: When
@@ -251,7 +249,7 @@ static int sama5d4_wdt_probe(struct platform_device *pdev)
 
 	timeout = WDT_SEC2TICKS(wdd->timeout);
 
-	wdt->mr |= AT91_WDT_SET_WDD(timeout);
+	wdt->mr |= AT91_WDT_SET_WDD(WDT_SEC2TICKS(MAX_WDT_TIMEOUT));
 	wdt->mr |= AT91_WDT_SET_WDV(timeout);
 
 	ret = sama5d4_wdt_init(wdt);