cpufreq: CPPC: Correct desired_perf calculation
The desired_perf is an abstract performance number. Its value should be in the range of [lowest perf, highest perf] of CPPC. The correct calculation is desired_perf = freq * cppc_highest_perf / cppc_dmi_max_khz And cppc_cpufreq_set_target() returns if desired_perf is exactly the same with the old perf. Signed-off-by: Hoan Tran <hotran@apm.com> Reviewed-by: Prashanth Prakash <pprakash@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -80,11 +80,17 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
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{
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{
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struct cpudata *cpu;
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struct cpudata *cpu;
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struct cpufreq_freqs freqs;
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struct cpufreq_freqs freqs;
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u32 desired_perf;
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int ret = 0;
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int ret = 0;
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cpu = all_cpu_data[policy->cpu];
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cpu = all_cpu_data[policy->cpu];
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cpu->perf_ctrls.desired_perf = (u64)target_freq * policy->max / cppc_dmi_max_khz;
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desired_perf = (u64)target_freq * cpu->perf_caps.highest_perf / cppc_dmi_max_khz;
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/* Return if it is exactly the same perf */
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if (desired_perf == cpu->perf_ctrls.desired_perf)
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return ret;
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cpu->perf_ctrls.desired_perf = desired_perf;
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freqs.old = policy->cur;
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freqs.old = policy->cur;
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freqs.new = target_freq;
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freqs.new = target_freq;
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