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| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2016-11-29 08:03:04 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-11-29 14:02:21 +0100 |
| commit | bb8313b603eb8fd52de48a079bfcd72dcab2ef1e (patch) | |
| tree | 909fb13b3c68408b772568d2e1be11fb99d5e2cb /drivers/cpuidle/cpuidle.c | |
| parent | cpuidle/powernv: staticise powernv_idle_driver (diff) | |
| download | linux-bb8313b603eb8fd52de48a079bfcd72dcab2ef1e.tar.xz linux-bb8313b603eb8fd52de48a079bfcd72dcab2ef1e.zip | |
cpuidle: Allow enforcing deepest idle state selection
When idle injection is used to cap power, we need to override the
governor's choice of idle states.
For this reason, make it possible the deepest idle state selection to
be enforced by setting a flag on a given CPU to achieve the maximum
potential power draw reduction.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle/cpuidle.c')
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index c73207abb5a4..afc005b917fe 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -97,7 +97,17 @@ static int find_deepest_state(struct cpuidle_driver *drv, return ret; } -#ifdef CONFIG_SUSPEND +/* Set the current cpu to use the deepest idle state, override governors */ +void cpuidle_use_deepest_state(bool enable) +{ + struct cpuidle_device *dev; + + preempt_disable(); + dev = cpuidle_get_device(); + dev->use_deepest_state = enable; + preempt_enable(); +} + /** * cpuidle_find_deepest_state - Find the deepest available idle state. * @drv: cpuidle driver for the given CPU. @@ -109,6 +119,7 @@ int cpuidle_find_deepest_state(struct cpuidle_driver *drv, return find_deepest_state(drv, dev, UINT_MAX, 0, false); } +#ifdef CONFIG_SUSPEND static void enter_freeze_proper(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index) { |