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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: Doug Smythies <dsmythies@telus.net>
Suggested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Yu Chen <yu.c.chen@intel.com>
[ rjw: Subject/changelog, minor modifications ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Chen Yu 2018-01-29 10:27:57 +08:00 committed by Rafael J. Wysocki
parent 0725390da9
commit 70f6bf2a3b
1 changed files with 5 additions and 0 deletions
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5
drivers/cpufreq/intel_pstate.c
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@ -779,6 +779,8 @@ static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
return 0;
}
static void intel_pstate_hwp_enable(struct cpudata *cpudata);
static int intel_pstate_resume(struct cpufreq_policy *policy)
{
if (!hwp_active)
@ -786,6 +788,9 @@ static int intel_pstate_resume(struct cpufreq_policy *policy)
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;
intel_pstate_hwp_set(policy->cpu);