watchdog: w83627hf: Enable watchdog device only if not already enabled
There is no need to enable the watchdog device if it is already enabled.
Also, when enabling the watchdog device, only set the watchdog device
enable bit and do not touch other bits; depending on the chip type,
those bits may enable other functionality.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 910d437..c5d34f46e7 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -107,7 +107,9 @@
}
outb_p(0x30, WDT_EFER); /* select CR30 */
- outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
+ t = inb(WDT_EFDR);
+ if (!(t & 0x01))
+ outb_p(t | 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
t = inb_p(WDT_EFDR); /* read CRF6 */