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authorGuenter Roeck <linux@roeck-us.net>2013-08-17 22:58:41 +0200
committerWim Van Sebroeck <wim@iguana.be>2013-11-18 21:34:13 +0100
commitac461103c57ac46cd6778f1fd0352ff0e4a2d38e (patch)
tree720b6be69743d35460470f9eca953c0531755e02 /drivers/watchdog/w83627hf_wdt.c
parentwatchdog: w83627hf: Enable watchdog only once (diff)
downloadlinux-ac461103c57ac46cd6778f1fd0352ff0e4a2d38e.tar.xz
linux-ac461103c57ac46cd6778f1fd0352ff0e4a2d38e.zip
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>
Diffstat (limited to 'drivers/watchdog/w83627hf_wdt.c')
-rw-r--r--drivers/watchdog/w83627hf_wdt.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 910d43736821..c5d34f46e7ad 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -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 */