Merge tag 'msm-fix-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux...

From David Brown <davidb@codeaurora.org>:

This fix is intended for v3.9.  It fixes a timer bug on MSM targets
that cause system hangs.

* tag 'msm-fix-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm:
  ARM: msm: Stop counting before reprogramming clockevent

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 2969027f02fa57045ec7bb3d65d7a98927cfde3c..f9fd77e8f1f5a998af7b8f15e12af3afd5bcc299 100644 (file)
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -62,7 +62,10 @@ static int msm_timer_set_next_event(unsigned long cycles,
 {
        u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE);
 
-       writel_relaxed(0, event_base + TIMER_CLEAR);
+       ctrl &= ~TIMER_ENABLE_EN;
+       writel_relaxed(ctrl, event_base + TIMER_ENABLE);
+
+       writel_relaxed(ctrl, event_base + TIMER_CLEAR);
        writel_relaxed(cycles, event_base + TIMER_MATCH_VAL);
        writel_relaxed(ctrl | TIMER_ENABLE_EN, event_base + TIMER_ENABLE);
        return 0;