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drivers: cpuidle: lpm-levels: Move local_irq_enable

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Cancelling histtimer after enabling local irqs can cause
low sleep length to get calculated during next low power mode
entry.

Enable local irqs after cancelling histtimer.
Use hrtimer_get_remaining before cancelling timer.

Change-Id: I735770f779c5760acc6b62cb65811b21244d0e99
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
This commit is contained in:
Maulik Shah 2018-05-28 13:57:53 +05:30 • committed by Gerrit - the friendly Code Review server
commit 8b9699ddee
1 changed files with 18 additions and 3 deletions
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21
drivers/cpuidle/lpm-levels.c
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@ -195,6 +195,11 @@ static void histtimer_cancel(void)
{
unsigned int cpu = raw_smp_processor_id();
struct hrtimer *cpu_histtimer = &per_cpu(histtimer, cpu);
ktime_t time_rem;
time_rem = hrtimer_get_remaining(cpu_histtimer);
if (ktime_to_us(time_rem) <= 0)
return;
hrtimer_try_to_cancel(cpu_histtimer);
}
@ -240,11 +245,21 @@ static void clusttimer_cancel(void)
{
int cpu = raw_smp_processor_id();
struct lpm_cluster *cluster = per_cpu(cpu_lpm, cpu)->parent;
ktime_t time_rem;
hrtimer_try_to_cancel(&cluster->histtimer);
time_rem = hrtimer_get_remaining(&cluster->histtimer);
if (ktime_to_us(time_rem) > 0)
hrtimer_try_to_cancel(&cluster->histtimer);
if (cluster->parent) {
time_rem = hrtimer_get_remaining(
&cluster->parent->histtimer);
if (ktime_to_us(time_rem) <= 0)
return;
if (cluster->parent)
hrtimer_try_to_cancel(&cluster->parent->histtimer);
}
}
static enum hrtimer_restart clusttimer_fn(struct hrtimer *h)
@ -1197,11 +1212,11 @@ exit:
dev->last_residency = ktime_us_delta(ktime_get(), start);
update_history(dev, idx);
trace_cpu_idle_exit(idx, success);
local_irq_enable();
if (lpm_prediction && cpu->lpm_prediction) {
histtimer_cancel();
clusttimer_cancel();
}
local_irq_enable();
return idx;
}