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Date: Thu, 18 Jan 2024 04:05:13 -0800 From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> To: rafael@...nel.org, viresh.kumar@...aro.org Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> Subject: [PATCH] cpufreq: intel_pstate: Directly use stored ratios for max frequencies Avoid unnecessary calculation for converting frequency to performance ratio by using a scaling factor for the maximum non turbo and turbo frequency. Here the driver already stored performance ratios for max non turbo and turbo frequency by reading from MSR_HWP_CAPABILITIES. Directly use those ratios without any calculations. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> --- drivers/cpufreq/intel_pstate.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2ca70b0b5fdc..6bbc21ca96e0 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2532,7 +2532,14 @@ static void intel_pstate_update_perf_limits(struct cpudata *cpu, int freq; freq = max_policy_perf * perf_ctl_scaling; - max_policy_perf = DIV_ROUND_UP(freq, scaling); + + if (freq == cpu->pstate.turbo_freq) + max_policy_perf = cpu->pstate.turbo_pstate; + else if (freq == cpu->pstate.max_freq) + max_policy_perf = cpu->pstate.max_pstate; + else + max_policy_perf = DIV_ROUND_UP(freq, scaling); + freq = min_policy_perf * perf_ctl_scaling; min_policy_perf = DIV_ROUND_UP(freq, scaling); } -- 2.40.1
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