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watchdog: w83627hf: Enable watchdog device only if not already enabled

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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>
This commit is contained in:
Guenter Roeck 2013-08-17 13:58:41 -07:00 committed by Wim Van Sebroeck
parent 8f52638959
commit ac461103c5
1 changed files with 3 additions and 1 deletions
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4
drivers/watchdog/w83627hf_wdt.c
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@ -107,7 +107,9 @@ static void w83627hf_init(struct watchdog_device *wdog)
}
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 */