Commit 8913315e authored Apr 06, 2018 by Shunyong Yang Committed by Rafael J. Wysocki Apr 10, 2018

cpufreq: CPPC: Initialize shared perf capabilities of CPUs



When multiple CPUs are related in one cpufreq policy, the first online
CPU will be chosen by default to handle cpufreq operations. Let's take
cpu0 and cpu1 as an example.

When cpu0 is offline, policy->cpu will be shifted to cpu1. cpu1's perf
capabilities should be initialized. Otherwise, perf capabilities are 0s
and speed change can not take effect.

This patch copies perf capabilities of the first online CPU to other
shared CPUs when policy shared type is CPUFREQ_SHARED_TYPE_ANY.

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent bbcc3285

drivers/cpufreq/cppc_cpufreq.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -166,9 +166,19 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
		NSEC_PER_USEC;
		policy->shared_type = cpu->shared_type;

		if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY)
		if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
		int i;

		cpumask_copy(policy->cpus, cpu->shared_cpu_map);
		else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {

		for_each_cpu(i, policy->cpus) {
		if (unlikely(i == policy->cpu))
		continue;

		memcpy(&all_cpu_data[i]->perf_caps, &cpu->perf_caps,
		sizeof(cpu->perf_caps));
		}
		} else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {
		/* Support only SW_ANY for now. */
		pr_debug("Unsupported CPU co-ord type\n");
		return -EFAULT;