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Merge branch 'pm-cpuidle' into pm-shmobile

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* pm-cpuidle:
  PM / cpuidle: Make ladder governor use the "disabled" state flag
  Honor state disabling in the cpuidle ladder governor
This commit is contained in:
Rafael J. Wysocki 2012-09-04 01:45:50 +02:00
commit 6bf9af464c
2 changed files with 14 additions and 2 deletions
Documentation/cpuidle
sysfs.txt
drivers/cpuidle/governors
ladder.c

10
Documentation/cpuidle/sysfs.txt
View file

@ -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.

6
drivers/cpuidle/governors/ladder.c
View file

@ -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--) {