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authorViresh Kumar <viresh.kumar@linaro.org>2013-03-02 11:10:13 +0100
committerDaniel Lezcano <daniel.lezcano@linaro.org>2013-08-22 00:18:53 +0200
commit887708f0ac7641e7d5131409cedf6774f26f0cb6 (patch)
treec153eb8539af6b982a266e96a692593b7bf1ca68
parent74adcbffa8f4d9d39d72d20d80ee62be279ebf44 (diff)
downloadop-kernel-dev-887708f0ac7641e7d5131409cedf6774f26f0cb6.zip
op-kernel-dev-887708f0ac7641e7d5131409cedf6774f26f0cb6.tar.gz
ARM: timer-sp: Set dynamic irq affinity
When a cpu goes to a deep idle state where its local timer is shutdown, it notifies the time frame work to use the broadcast timer instead. Unfortunately, the broadcast device could wake up any CPU, including an idle one which is not concerned by the wake up at all. This implies, in the worst case, an idle CPU will wake up to send an IPI to another idle cpu. This patch fixes this for ARM platforms using timer-sp, by setting CLOCK_EVT_FEAT_DYNIRQ feature. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
-rw-r--r--arch/arm/common/timer-sp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
index 023ee63..e901d0f 100644
--- a/arch/arm/common/timer-sp.c
+++ b/arch/arm/common/timer-sp.c
@@ -166,7 +166,8 @@ static int sp804_set_next_event(unsigned long next,
}
static struct clock_event_device sp804_clockevent = {
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
+ CLOCK_EVT_FEAT_DYNIRQ,
.set_mode = sp804_set_mode,
.set_next_event = sp804_set_next_event,
.rating = 300,
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