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qcom-cpufreq: Restore CPU frequency during resume

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qcom-cpufreq blocks CPU frequency change request during suspend, because
its dependencies might be suspended. Thus a freq change request would
fail silently, and CPU clock won't change until first frequency update
is requested after system comes out of suspend. This creates a period
when thermal driver cannot perform frequency mitigation, even though
policy->min/max have been correctly updated.

Check each online CPU's policy during resume to correct any frequency
violation as soon as possible.

Change-Id: I3be79cf91e7d5e361314020c9806b770823c0b72
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
This commit is contained in:
Junjie Wu 2014-12-01 21:21:00 -08:00 • committed by David Keitel
parent 9c69b365d2
commit f1e1ba3b6c
1 changed files with 24 additions and 1 deletions
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25
drivers/cpufreq/qcom-cpufreq.c
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@ -262,12 +262,35 @@ static int msm_cpufreq_suspend(void)
static int msm_cpufreq_resume(void)
{
int cpu;
int cpu, ret;
struct cpufreq_policy policy;
for_each_possible_cpu(cpu) {
per_cpu(cpufreq_suspend, cpu).device_suspended = 0;
}
/*
* Freq request might be rejected during suspend, resulting
* in policy->cur violating min/max constraint.
* Correct the frequency as soon as possible.
*/
get_online_cpus();
for_each_online_cpu(cpu) {
ret = cpufreq_get_policy(&policy, cpu);
if (ret)
continue;
if (policy.cur <= policy.max && policy.cur >= policy.min)
continue;
ret = cpufreq_update_policy(cpu);
if (ret)
pr_info("cpufreq: Current frequency violates policy min/max for CPU%d\n",
cpu);
else
pr_info("cpufreq: Frequency violation fixed for CPU%d\n",
cpu);
}
put_online_cpus();
return NOTIFY_DONE;
}