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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2017-01-18 10:48:24 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-02-04 00:05:32 +0100 |
| commit | 4e5d3f713b619e404618fc280ce861e473605f85 (patch) | |
| tree | 8bf13d6d6fa0436449d534999498222695ce7f16 /drivers/cpufreq | |
| parent | 7d9a8a9f4ee682e299fa2acee48031713aef1b76 (diff) | |
| download | lwn-4e5d3f713b619e404618fc280ce861e473605f85.tar.gz lwn-4e5d3f713b619e404618fc280ce861e473605f85.zip | |
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: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 735e3e8ee91d..95482099aa96 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -875,7 +875,10 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy) rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap); hw_min = HWP_LOWEST_PERF(cap); - hw_max = HWP_HIGHEST_PERF(cap); + if (limits->no_turbo) + hw_max = HWP_GUARANTEED_PERF(cap); + else + hw_max = HWP_HIGHEST_PERF(cap); range = hw_max - hw_min; max_perf_pct = perf_limits->max_perf_pct; @@ -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); |