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authorShunyong Yang <shunyong.yang@hxt-semitech.com>2018-04-06 10:43:49 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-04-10 08:38:02 +0200
commit8913315e9459b146e5888ab5138e10daa061b885 (patch)
tree4090fd8c18406541ad0e73c9f3bf071be941d9f3 /drivers/cpufreq
parentbbcc328561040292f7d6796954d478e4a2335e6f (diff)
downloadlinux-8913315e9459b146e5888ab5138e10daa061b885.tar.bz2
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>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cppc_cpufreq.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 38f65c371139..bc5fc1630876 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -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;