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Commit 887e301a authored by Venkatesh Pallipadi's avatar Venkatesh Pallipadi Committed by Len Brown
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cpuidle: use last_state which can reflect the actual state entered 



cpuidle accounts the idle time for the C-state it was trying to enter and
not to the actual state that the driver eventually entered. The driver may
select a different state than the one chosen by cpuidle due to
constraints like bus-mastering, etc.

Change the time acounting code to look at the dev->last_state after
returning from target_state->enter(). Driver can modify dev->last_state
internally, inside the enter routine to reflect the actual C-state
entered.

Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Tested-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 3fa8749e

drivers/cpuidle/cpuidle.c

+4 −1
Original line number Diff line number Diff line
@@ -67,8 +67,11 @@ static void cpuidle_idle_call(void) 
	target_state = &dev->states[next_state];



	/* enter the state and update stats */

	dev->last_residency = target_state->enter(dev, target_state);

	dev->last_state = target_state;

	dev->last_residency = target_state->enter(dev, target_state);

	if (dev->last_state)

		target_state = dev->last_state;



	target_state->time += (unsigned long long)dev->last_residency;

	target_state->usage++;