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Commit c197d758 authored by Hoan Tran's avatar Hoan Tran Committed by Rafael J. Wysocki
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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: default avatarHoan Tran <hotran@apm.com>
Reviewed-by: default avatarPrashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent abb66279

drivers/cpufreq/cppc_cpufreq.c

+7 −1
Original line number Diff line number Diff line
@@ -80,11 +80,17 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy, 
{

	struct cpudata *cpu;

	struct cpufreq_freqs freqs;

	u32 desired_perf;

	int ret = 0;



	cpu = all_cpu_data[policy->cpu];



	cpu->perf_ctrls.desired_perf = (u64)target_freq * policy->max / cppc_dmi_max_khz;

	desired_perf = (u64)target_freq * cpu->perf_caps.highest_perf / cppc_dmi_max_khz;

	/* Return if it is exactly the same perf */

	if (desired_perf == cpu->perf_ctrls.desired_perf)

		return ret;



	cpu->perf_ctrls.desired_perf = desired_perf;

	freqs.old = policy->cur;

	freqs.new = target_freq;