cpufreq / intel_pstate: Fix max_perf_pct on resume

If the system is suspended while max_perf_pct is less than 100 percent
or no_turbo set policy->{min,max} will be set incorrectly with scaled
values which turn the scaled values into hard limits.

References: https://bugzilla.kernel.org/show_bug.cgi?id=61241
Reported-by: Patrick Bartels <petzicus@googlemail.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Cc: 3.9+ <stable@vger.kernel.org> # 3.9+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 32b3479..28fefe3 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -637,8 +637,8 @@ static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
 
 static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
 {
-       int rc, min_pstate, max_pstate;
        struct cpudata *cpu;
+       int rc;
 
        rc = intel_pstate_init_cpu(policy->cpu);
        if (rc)
@@ -652,9 +652,8 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
        else
                policy->policy = CPUFREQ_POLICY_POWERSAVE;
 
-       intel_pstate_get_min_max(cpu, &min_pstate, &max_pstate);
-       policy->min = min_pstate * 100000;
-       policy->max = max_pstate * 100000;
+       policy->min = cpu->pstate.min_pstate * 100000;
+       policy->max = cpu->pstate.turbo_pstate * 100000;
 
        /* cpuinfo and default policy values */
        policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000;