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Commit d1b68485 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki
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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: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 49ded525

drivers/cpufreq/intel_pstate.c

+9 −12
Original line number Diff line number Diff line 
/*

 * 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;

}