Commit 70f6bf2a authored by Chen Yu's avatar Chen Yu Committed by Rafael J. Wysocki

cpufreq: intel_pstate: Enable HWP during system resume on CPU0

When maxcpus=1 is in the kernel command line, the BP is responsible
for re-enabling the HWP - because currently only the APs invoke
intel_pstate_hwp_enable() during their online process - which might
put the system into unstable state after resume.

Fix this by enabling the HWP explicitly on BP during resume.
Reported-by: default avatarDoug Smythies <dsmythies@telus.net>
Suggested-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarYu Chen <yu.c.chen@intel.com>
[ rjw: Subject/changelog, minor modifications ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 0725390d
...@@ -779,6 +779,8 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) ...@@ -779,6 +779,8 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
return 0; return 0;
} }
static void intel_pstate_hwp_enable(struct cpudata *cpudata);
static int intel_pstate_resume(struct cpufreq_policy *policy) static int intel_pstate_resume(struct cpufreq_policy *policy)
{ {
if (!hwp_active) if (!hwp_active)
...@@ -786,6 +788,9 @@ static int intel_pstate_resume(struct cpufreq_policy *policy) ...@@ -786,6 +788,9 @@ static int intel_pstate_resume(struct cpufreq_policy *policy)
mutex_lock(&intel_pstate_limits_lock); mutex_lock(&intel_pstate_limits_lock);
if (policy->cpu == 0)
intel_pstate_hwp_enable(all_cpu_data[policy->cpu]);
all_cpu_data[policy->cpu]->epp_policy = 0; all_cpu_data[policy->cpu]->epp_policy = 0;
intel_pstate_hwp_set(policy->cpu); intel_pstate_hwp_set(policy->cpu);
......
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