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>
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Rafael J. Wysocki
parent
ed61390bff
commit
bb8313b603
@ -164,11 +164,14 @@ static void cpuidle_idle_call(void)
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* timekeeping to prevent timer interrupts from kicking us out of idle
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* until a proper wakeup interrupt happens.
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*/
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if (idle_should_freeze()) {
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entered_state = cpuidle_enter_freeze(drv, dev);
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if (entered_state > 0) {
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local_irq_enable();
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goto exit_idle;
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if (idle_should_freeze() || dev->use_deepest_state) {
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if (idle_should_freeze()) {
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entered_state = cpuidle_enter_freeze(drv, dev);
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if (entered_state > 0) {
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local_irq_enable();
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goto exit_idle;
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}
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}
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next_state = cpuidle_find_deepest_state(drv, dev);
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