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Commit 4e5d3f71 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki
Browse files

cpufreq: intel_pstate: Make HWP limits compatible with legacy 



Under HWP the performance limits are calculated using max_perf_pct
and min_perf_pct using possible performance, not available performance.
The available performance can be reduced by no_turbo setting. To make
compatible with legacy mode, use max/min performance percentage with
respect to available performance.

Signed-off-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7d9a8a9f

drivers/cpufreq/intel_pstate.c

+4 −6
Original line number Diff line number Diff line
@@ -875,6 +875,9 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy) 


		rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);

		hw_min = HWP_LOWEST_PERF(cap);

		if (limits->no_turbo)

			hw_max = HWP_GUARANTEED_PERF(cap);

		else

			hw_max = HWP_HIGHEST_PERF(cap);

		range = hw_max - hw_min;
@@ -889,11 +892,6 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy) 


		adj_range = max_perf_pct * range / 100;

		max = hw_min + adj_range;

		if (limits->no_turbo) {

			hw_max = HWP_GUARANTEED_PERF(cap);

			if (hw_max < max)

				max = hw_max;

		}



		value &= ~HWP_MAX_PERF(~0L);

		value |= HWP_MAX_PERF(max);