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Commit 6bf9af46 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'pm-cpuidle' into pm-shmobile 

* pm-cpuidle:
  PM / cpuidle: Make ladder governor use the "disabled" state flag
  Honor state disabling in the cpuidle ladder governor
parents 5b41147c 66804c13

Documentation/cpuidle/sysfs.txt

+9 −1
Original line number Diff line number Diff line
@@ -76,9 +76,17 @@ total 0 




* desc : Small description about the idle state (string)

* disable : Option to disable this idle state (bool)

* disable : Option to disable this idle state (bool) -> see note below

* latency : Latency to exit out of this idle state (in microseconds)

* name : Name of the idle state (string)

* power : Power consumed while in this idle state (in milliwatts)

* time : Total time spent in this idle state (in microseconds)

* usage : Number of times this state was entered (count)



Note:

The behavior and the effect of the disable variable depends on the

implementation of a particular governor. In the ladder governor, for

example, it is not coherent, i.e. if one is disabling a light state,

then all deeper states are disabled as well, but the disable variable

does not reflect it. Likewise, if one enables a deep state but a lighter

state still is disabled, then this has no effect.

drivers/cpuidle/governors/ladder.c

+5 −1
Original line number Diff line number Diff line
@@ -88,6 +88,8 @@ static int ladder_select_state(struct cpuidle_driver *drv, 


	/* consider promotion */

	if (last_idx < drv->state_count - 1 &&

	    !drv->states[last_idx + 1].disabled &&

	    !dev->states_usage[last_idx + 1].disable &&

	    last_residency > last_state->threshold.promotion_time &&

	    drv->states[last_idx + 1].exit_latency <= latency_req) {

		last_state->stats.promotion_count++;
@@ -100,7 +102,9 @@ static int ladder_select_state(struct cpuidle_driver *drv, 


	/* consider demotion */

	if (last_idx > CPUIDLE_DRIVER_STATE_START &&

	    drv->states[last_idx].exit_latency > latency_req) {

	    (drv->states[last_idx].disabled ||

	    dev->states_usage[last_idx].disable ||

	    drv->states[last_idx].exit_latency > latency_req)) {

		int i;



		for (i = last_idx - 1; i > CPUIDLE_DRIVER_STATE_START; i--) {