[PATCH] ARM: smp: Allow real broadcast device selection instead of always dummy

Santosh Shilimkar santosh.shilimkar at ti.com
Wed Mar 13 05:06:48 EDT 2013

With recent arm broadcast time clean-up from Mark Rutland, the dummy
broadcast device is always registered with timer subsystem. And since
the rating of the dummy clock event is very high, it is preferred
over a real broad-cast clock event.

This is a change in behavior from past and not an intended
one. So reduce the rating of the dummy clockevent so that
real broadcast device is selected when available.

Without this all the C states with C3STOP won't work since
the broad cast notifier will take an abort.

Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Russell King <linux at arm.linux.org.uk>

Signed-off-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
Its a regression so hopefully can get into the 3.9-rcx. Noticed
this one on A15 platform. A9 platform the issue may not be seen
since the local timer check avoids dummy timer registration.

 arch/arm/kernel/smp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 31644f1..79078ed 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -480,7 +480,7 @@ static void __cpuinit broadcast_timer_setup(struct clock_event_device *evt)
 	evt->features	= CLOCK_EVT_FEAT_ONESHOT |
-	evt->rating	= 400;
+	evt->rating	= 100;
 	evt->mult	= 1;
 	evt->set_mode	= broadcast_timer_set_mode;

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