watchdog: sama5d4: readout initial state

Readout the AT91_WDT_MR bit at probe so that it becomes possible to get the
pre-userspace handler working.

Signed-off-by: Mathieu Othacehe <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/sama5d4_wdt.c

···
 	struct sama5d4_wdt *wdt;
 	void __iomem *regs;
 	u32 irq = 0;
+	u32 reg;
 	int ret;
 
 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
···
 	}
 
 	watchdog_init_timeout(wdd, wdt_timeout, dev);
+
+	reg = wdt_read(wdt, AT91_WDT_MR);
+	if (!(reg & AT91_WDT_WDDIS)) {
+		wdt->mr &= ~AT91_WDT_WDDIS;
+		set_bit(WDOG_HW_RUNNING, &wdd->status);
+	}
 
 	ret = sama5d4_wdt_init(wdt);
 	if (ret)