watchdog: f71808e_wdt: fix F81866 bit operation

Fix error bit operation in watchdog_start()

Fixes: 14b24a88 ("watchdog: f71808e_wdt: Add F81866 support")
Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/f71808e_wdt.c

@@ -339,6 +339,7 @@ static int f71862fg_pin_configure(unsigned short ioaddr)
 static int watchdog_start(void)
 {
 	int err;
+	u8 tmp;
 
 	/* Make sure we don't die as soon as the watchdog is enabled below */
 	err = watchdog_keepalive();
@@ -388,19 +389,18 @@ static int watchdog_start(void)
 		break;
 
 	case f81866:
-		/* Set pin 70 to WDTRST# */
-		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
-				  BIT(3) | BIT(0));
-		superio_set_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
-				BIT(2));
 		/*
 		 * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.
 		 * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:
 		 *     BIT5: 0 -> WDTRST#
 		 *           1 -> GPIO15
 		 */
-		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1,
-				  BIT(5));
+		tmp = superio_inb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL);
+		tmp &= ~(BIT(3) | BIT(0));
+		tmp |= BIT(2);
+		superio_outb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL, tmp);
+
+		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1, 5);
 		break;
 
 	default: