diff options
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 9578312e43f2..106402b89961 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -830,6 +830,28 @@ skip_epp: wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); } +static void intel_pstate_hwp_force_min_perf(int cpu) +{ + u64 value; + int min_perf; + + value = all_cpu_data[cpu]->hwp_req_cached; + value &= ~GENMASK_ULL(31, 0); + min_perf = HWP_LOWEST_PERF(all_cpu_data[cpu]->hwp_cap_cached); + + /* Set hwp_max = hwp_min */ + value |= HWP_MAX_PERF(min_perf); + value |= HWP_MIN_PERF(min_perf); + + /* Set EPP/EPB to min */ + if (static_cpu_has(X86_FEATURE_HWP_EPP)) + value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE); + else + intel_pstate_set_epb(cpu, HWP_EPP_BALANCE_POWERSAVE); + + wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); +} + static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) { struct cpudata *cpu_data = all_cpu_data[policy->cpu]; @@ -2084,10 +2106,12 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) pr_debug("CPU %d exiting\n", policy->cpu); intel_pstate_clear_update_util_hook(policy->cpu); - if (hwp_active) + if (hwp_active) { intel_pstate_hwp_save_state(policy); - else + intel_pstate_hwp_force_min_perf(policy->cpu); + } else { intel_cpufreq_stop_cpu(policy); + } } static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) |