cpufreq / intel_pstate: Optimize intel_pstate_set_policy

This function is called quite often from other subsystems.
Removed unused call to intel_pstate_get_min_max().
Also when "policy->policy == CPUFREQ_POLICY_PERFORMANCE", then
no need to do calculations as the limits will be forced anyway.
Also corrected filename in the header.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 9 insertions, 12 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index ad72922919ed..fb382427b059 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1,5 +1,5 @@
 /*
- * cpufreq_snb.c: Native P state management for Intel processors
+ * intel_pstate.c: Native P state management for Intel processors
  *
  * (C) Copyright 2012 Intel Corporation
  * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
@@ -658,30 +658,27 @@ static unsigned int intel_pstate_get(unsigned int cpu_num)
 static int intel_pstate_set_policy(struct cpufreq_policy *policy)
 {
         struct cpudata *cpu;
-        int min, max;
 
         cpu = all_cpu_data[policy->cpu];
 
         if (!policy->cpuinfo.max_freq)
                 return -ENODEV;
 
-        intel_pstate_get_min_max(cpu, &min, &max);
-
-        limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
-        limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
-        limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
-
-        limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq;
-        limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100);
-        limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
-
         if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
                 limits.min_perf_pct = 100;
                 limits.min_perf = int_tofp(1);
                 limits.max_perf_pct = 100;
                 limits.max_perf = int_tofp(1);
                 limits.no_turbo = 0;
+                return 0;
         }
+        limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
+        limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
+        limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
+
+        limits.max_perf_pct = policy->max * 100 / policy->cpuinfo.max_freq;
+        limits.max_perf_pct = clamp_t(int, limits.max_perf_pct, 0 , 100);
+        limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
 
         return 0;
 }