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PM: suspend: Do not pause cpuidle in the suspend-to-idle path

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It is pointless to pause cpuidle in the suspend-to-idle path,
because it is going to be resumed in the same path later and
pausing it does not serve any particular purpose in that case.

Rework the code to avoid doing that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2021-10-22 18:04:02 +02:00
parent 928265e360
commit 8d89835b04
2 changed files with 12 additions and 7 deletions
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11
drivers/base/power/main.c
View File

@ -747,8 +747,6 @@ void dpm_resume_noirq(pm_message_t state)
resume_device_irqs();
device_wakeup_disarm_wake_irqs();
cpuidle_resume();
}
/**
@ -881,6 +879,7 @@ void dpm_resume_early(pm_message_t state)
void dpm_resume_start(pm_message_t state)
{
dpm_resume_noirq(state);
cpuidle_resume();
dpm_resume_early(state);
}
EXPORT_SYMBOL_GPL(dpm_resume_start);
@ -1337,8 +1336,6 @@ int dpm_suspend_noirq(pm_message_t state)
{
int ret;
cpuidle_pause();
device_wakeup_arm_wake_irqs();
suspend_device_irqs();
@ -1522,9 +1519,13 @@ int dpm_suspend_end(pm_message_t state)
if (error)
goto out;
cpuidle_pause();
error = dpm_suspend_noirq(state);
if (error)
if (error) {
cpuidle_resume();
dpm_resume_early(resume_event(state));
}
out:
dpm_show_time(starttime, state, error, "end");

8
kernel/power/suspend.c
View File

@ -97,7 +97,6 @@ static void s2idle_enter(void)
raw_spin_unlock_irq(&s2idle_lock);
cpus_read_lock();
cpuidle_resume();
/* Push all the CPUs into the idle loop. */
wake_up_all_idle_cpus();
@ -105,7 +104,6 @@ static void s2idle_enter(void)
swait_event_exclusive(s2idle_wait_head,
s2idle_state == S2IDLE_STATE_WAKE);
cpuidle_pause();
cpus_read_unlock();
raw_spin_lock_irq(&s2idle_lock);
@ -405,6 +403,9 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
if (error)
goto Devices_early_resume;
if (state != PM_SUSPEND_TO_IDLE)
cpuidle_pause();
error = dpm_suspend_noirq(PMSG_SUSPEND);
if (error) {
pr_err("noirq suspend of devices failed\n");
@ -459,6 +460,9 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
dpm_resume_noirq(PMSG_RESUME);
Platform_early_resume:
if (state != PM_SUSPEND_TO_IDLE)
cpuidle_resume();
platform_resume_early(state);
Devices_early_resume: