[POWERPC] ppc: Fix booke watchdog initialization

Fix two problems in the book-e watchdog driver.

a) The 4xx default period was defined wrong
b) Clear status before enabling the watchdog exception

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 11 insertions, 9 deletions

diff --git a/drivers/char/watchdog/booke_wdt.c b/drivers/char/watchdog/booke_wdt.c
index 488902231cc2..0e23f29f71ab 100644
--- a/drivers/char/watchdog/booke_wdt.c
+++ b/drivers/char/watchdog/booke_wdt.c
@@ -35,7 +35,7 @@
 #ifdef  CONFIG_FSL_BOOKE
 #define WDT_PERIOD_DEFAULT 63   /* Ex. wdt_period=28 bus=333Mhz , reset=~40sec */
 #else
-#define WDT_PERIOD_DEFAULT 4    /* Refer to the PPC40x and PPC4xx manuals */
+#define WDT_PERIOD_DEFAULT 3    /* Refer to the PPC40x and PPC4xx manuals */
 #endif                          /* for timing information */
 
 u32 booke_wdt_enabled = 0;
@@ -48,12 +48,22 @@ u32 booke_wdt_period = WDT_PERIOD_DEFAULT;
 #endif
 
 /*
+ * booke_wdt_ping:
+ */
+static __inline__ void booke_wdt_ping(void)
+{
+        mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
+}
+
+/*
  * booke_wdt_enable:
  */
 static __inline__ void booke_wdt_enable(void)
 {
         u32 val;
 
+        /* clear status before enabling watchdog */
+        booke_wdt_ping();
         val = mfspr(SPRN_TCR);
         val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(booke_wdt_period));
 
@@ -61,14 +71,6 @@ static __inline__ void booke_wdt_enable(void)
 }
 
 /*
- * booke_wdt_ping:
- */
-static __inline__ void booke_wdt_ping(void)
-{
-        mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
-}
-
-/*
  * booke_wdt_write:
  */
 static ssize_t booke_wdt_write (struct file *file, const char __user *buf,