Commit 99907d60 authored by Lukasz Luba's avatar Lukasz Luba Committed by Rafael J. Wysocki
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PM: EM: Find first CPU active while updating OPP efficiency 



The Energy Model might be updated at runtime and the energy efficiency
for each OPP may change. Thus, there is a need to update also the
cpufreq framework and make it aligned to the new values. In order to
do that, use a first active CPU from the Performance Domain. This is
needed since the first CPU in the cpumask might be offline when we
run this code path.

Reviewed-by: default avatarHongyan Xia <hongyan.xia2@arm.com>
Reviewed-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Tested-by: default avatarDietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e7b1cc9a

kernel/power/energy_model.c

+9 −2
Original line number Diff line number Diff line
@@ -243,12 +243,19 @@ em_cpufreq_update_efficiencies(struct device *dev, struct em_perf_state *table) 
	struct em_perf_domain *pd = dev->em_pd;

	struct cpufreq_policy *policy;

	int found = 0;

	int i;

	int i, cpu;



	if (!_is_cpu_device(dev))

		return;



	policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd)));

	/* Try to get a CPU which is active and in this PD */

	cpu = cpumask_first_and(em_span_cpus(pd), cpu_active_mask);

	if (cpu >= nr_cpu_ids) {

		dev_warn(dev, "EM: No online CPU for CPUFreq policy\n");

		return;

	}



	policy = cpufreq_cpu_get(cpu);

	if (!policy) {

		dev_warn(dev, "EM: Access to CPUFreq policy failed\n");

		return;