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PM / suspend: Always use deepest C-state in the "freeze" sleep state

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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 <rafael.j.wysocki@intel.com>
Tested-by: Aubrey Li <aubrey.li@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2014-05-05 00:51:54 +02:00
parent bed4d597a0
commit a6220fc19a
3 changed files with 48 additions and 1 deletions
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2
kernel/power/suspend.c
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@ -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)