watchdog: Propagate Book E WDT period changes to all cores

When the watchdog period is changed, it needs to be propagated to all cores
in addition to the core that performed the change.

Signed-off-by: Randy Vinson <rvinson@mvista.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c
index 636e013e221e..7e7ec9c35b6a 100644
--- a/drivers/watchdog/booke_wdt.c
+++ b/drivers/watchdog/booke_wdt.c
@@ -85,6 +85,22 @@ static unsigned int sec_to_period(unsigned int secs)
         return 0;
 }
 
+static void __booke_wdt_set(void *data)
+{
+        u32 val;
+
+        val = mfspr(SPRN_TCR);
+        val &= ~WDTP_MASK;
+        val |= WDTP(booke_wdt_period);
+
+        mtspr(SPRN_TCR, val);
+}
+
+static void booke_wdt_set(void)
+{
+        on_each_cpu(__booke_wdt_set, NULL, 0);
+}
+
 static void __booke_wdt_ping(void *data)
 {
         mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
@@ -181,8 +197,7 @@ static long booke_wdt_ioctl(struct file *file,
 #else
                 booke_wdt_period = tmp;
 #endif
-                mtspr(SPRN_TCR, (mfspr(SPRN_TCR) & ~WDTP_MASK) |
-                                                WDTP(booke_wdt_period));
+                booke_wdt_set();
                 return 0;
         case WDIOC_GETTIMEOUT:
                 return put_user(booke_wdt_period, p);