[POWERPC] pasemi: Don't enter powersaving states from elevated astates

When the PWRficient cpus are entered into powersavings states, the
astate is automatically dropped down to 0. While we still restore it
when we come out of idle, it can still cause some weird effects with
respect to performance (especially since it takes a while to ramp up to
higher astates).

So, to avoid this, don't enter power savings when the cpufreq driver
(or user) has set higher astates than 0.

The restore is still required, since there's a chance the astate has
been raised from the other cpu while the idling one was asleep.

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pasemi/cpufreq.c b/arch/powerpc/platforms/pasemi/cpufreq.c
index 8caa1667cf34..58556b028a4c 100644
--- a/arch/powerpc/platforms/pasemi/cpufreq.c
+++ b/arch/powerpc/platforms/pasemi/cpufreq.c
@@ -32,6 +32,7 @@
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/time.h>
+#include <asm/smp.h>
 
 #define SDCASR_REG		0x0100
 #define SDCASR_REG_STRIDE	0x1000
@@ -124,6 +125,11 @@ static void set_astate(int cpu, unsigned int astate)
 	local_irq_restore(flags);
 }
 
+int check_astate(void)
+{
+	return get_cur_astate(hard_smp_processor_id());
+}
+
 void restore_astate(int cpu)
 {
 	set_astate(cpu, current_astate);