diff options
Diffstat (limited to 'drivers/cpufreq/cppc_cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cppc_cpufreq.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index e82bb3c30b92..10be285c9055 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -144,10 +144,23 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy) cppc_dmi_max_khz = cppc_get_dmi_max_khz(); - policy->min = cpu->perf_caps.lowest_perf * cppc_dmi_max_khz / cpu->perf_caps.highest_perf; + /* + * Set min to lowest nonlinear perf to avoid any efficiency penalty (see + * Section 8.4.7.1.1.5 of ACPI 6.1 spec) + */ + policy->min = cpu->perf_caps.lowest_nonlinear_perf * cppc_dmi_max_khz / + cpu->perf_caps.highest_perf; policy->max = cppc_dmi_max_khz; - policy->cpuinfo.min_freq = policy->min; - policy->cpuinfo.max_freq = policy->max; + + /* + * Set cpuinfo.min_freq to Lowest to make the full range of performance + * available if userspace wants to use any perf between lowest & lowest + * nonlinear perf + */ + policy->cpuinfo.min_freq = cpu->perf_caps.lowest_perf * cppc_dmi_max_khz / + cpu->perf_caps.highest_perf; + policy->cpuinfo.max_freq = cppc_dmi_max_khz; + policy->cpuinfo.transition_latency = cppc_get_transition_latency(cpu_num); policy->shared_type = cpu->shared_type; |