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Commit 609f6dc5 authored by Junjie Wu's avatar Junjie Wu Committed by Matt Wagantall
Browse files

qcom-cpufreq: Restore CPU frequency during resume 



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: default avatarJunjie Wu <junjiew@codeaurora.org>
parent d86d94ca

drivers/cpufreq/qcom-cpufreq.c

+24 −1
Original line number Diff line number Diff line
@@ -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;

}