From a6220fc19afc07fe77cfd16f5b8e568615517091 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 5 May 2014 00:51:54 +0200 Subject: PM / suspend: Always use deepest C-state in the "freeze" sleep state If freeze_enter() is called, we want to bypass the current cpuidle governor and always use the deepest available (that is, not disabled) C-state, because we want to save as much energy as reasonably possible then and runtime latency constraints don't matter at that point, since the system is in a sleep state anyway. Signed-off-by: Rafael J. Wysocki Tested-by: Aubrey Li --- kernel/power/suspend.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'kernel/power') diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 8233cd4047d7..155721f7f909 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -54,9 +54,11 @@ static void freeze_begin(void) static void freeze_enter(void) { + cpuidle_use_deepest_state(true); cpuidle_resume(); wait_event(suspend_freeze_wait_head, suspend_freeze_wake); cpuidle_pause(); + cpuidle_use_deepest_state(false); } void freeze_wake(void) -- cgit v1.2.3