ARM: tegra: power: Check Tegra3 auto-hotplug speed balance

When current CPU complex frequency is above target range:
- bring new core on-line only if cpufreq governor requests for
all already on-lined CPUs are above 50% of current CPU frequency
- off-line one core (despite high pick request) if cpufreq
governor requests for at least 2 on-lined CPUs are below 25% of
current CPU frequency
- do nothing if neither of the above conditions is true

Original-Change-Id: I77e1bd543a8fadd51974f7d574f256a6e7e2979a
Reviewed-on: http://git-master/r/29702
Reviewed-by: Aleksandr Frid <afrid@nvidia.com>
Tested-by: Aleksandr Frid <afrid@nvidia.com>
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Tested-by: Diwakar Tundlam <dtundlam@nvidia.com>
Reviewed-by: Scott Williams <scwilliams@nvidia.com>

Rebase-Id: Rc5c717454d1e09ca97ccc79fff60cb33fcf854e9

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h
index 0f1719ed5a36..55c2cc044466 100644
--- a/arch/arm/mach-tegra/pm.h
+++ b/arch/arm/mach-tegra/pm.h
@@ -81,6 +81,7 @@ void __init tegra_init_suspend(struct tegra_suspend_platform_data *plat);
 
 void tegra_idle_lp2(void);
 
+unsigned int tegra_count_slow_cpus(unsigned long speed_limit);
 unsigned int tegra_get_slowest_cpu_n(void);
 unsigned long tegra_cpu_lowest_speed(void);
 unsigned long tegra_cpu_highest_speed(void);