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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2013-10-01 10:28:41 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-10-01 22:51:11 +0200 |
| commit | 1ccf7a1cdafadd02e33e8f3d74370685a0600ec6 (patch) | |
| tree | 445d1c1b9d4b4fde1338dfb97adff05b4a04d2b6 /drivers/cpufreq/intel_pstate.c | |
| parent | 43c638e3dd48ff1b1a93ea01c98e258e693880c3 (diff) | |
| download | lwn-1ccf7a1cdafadd02e33e8f3d74370685a0600ec6.tar.gz lwn-1ccf7a1cdafadd02e33e8f3d74370685a0600ec6.zip | |
intel_pstate: fix no_turbo
When sysfs for no_turbo is set, then also some p states in turbo regions
are observed. This patch will set IDA Engage bit when no_turbo is set to
explicitly disengage turbo.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 9733f29ed148..32b3479a2405 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -394,7 +394,10 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) trace_cpu_frequency(pstate * 100000, cpu->cpu); cpu->pstate.current_pstate = pstate; - wrmsrl(MSR_IA32_PERF_CTL, pstate << 8); + if (limits.no_turbo) + wrmsrl(MSR_IA32_PERF_CTL, BIT(32) | (pstate << 8)); + else + wrmsrl(MSR_IA32_PERF_CTL, pstate << 8); } |