watchdog: sch311x_wdt: Fix Polarity when starting watchdog
Some motherboards like the Advantech ARK3400 documentation
use a non-inverted GPIO pin. We fix this by assuming that
the BIOS will set the Polarity bit for the GPIO correctly
at startup and we keep the Bit-setting intact when we start
and stop the watchdog.
Reported-by: Jean-François Deverge <jf.deverge@gmail.com>
Signed-off-by: Dave Mueller <d.mueller@elsoft.ch>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/sch311x_wdt.c b/drivers/watchdog/sch311x_wdt.c
index f847700..9681ada 100644
--- a/drivers/watchdog/sch311x_wdt.c
+++ b/drivers/watchdog/sch311x_wdt.c
@@ -136,6 +136,8 @@
static void sch311x_wdt_start(void)
{
+ unsigned char t;
+
spin_lock(&sch311x_wdt_data.io_lock);
/* set watchdog's timeout */
@@ -149,7 +151,8 @@
* Bit 4-6 (Reserved)
* Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
*/
- outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);
+ t = inb(sch311x_wdt_data.runtime_reg + GP60);
+ outb((t & ~0x0d) | 0x0c, sch311x_wdt_data.runtime_reg + GP60);
spin_unlock(&sch311x_wdt_data.io_lock);
@@ -157,10 +160,13 @@
static void sch311x_wdt_stop(void)
{
+ unsigned char t;
+
spin_lock(&sch311x_wdt_data.io_lock);
/* stop the watchdog */
- outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
+ t = inb(sch311x_wdt_data.runtime_reg + GP60);
+ outb((t & ~0x0d) | 0x01, sch311x_wdt_data.runtime_reg + GP60);
/* disable timeout by setting it to 0 */
sch311x_wdt_set_timeout(0);