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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2013-10-01 21:28:41 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-10-02 00:51:11 +0400
commit1ccf7a1cdafadd02e33e8f3d74370685a0600ec6 (patch)
tree445d1c1b9d4b4fde1338dfb97adff05b4a04d2b6 /drivers/cpufreq
parent43c638e3dd48ff1b1a93ea01c98e258e693880c3 (diff)
downloadlinux-1ccf7a1cdafadd02e33e8f3d74370685a0600ec6.tar.xz
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')
-rw-r--r--drivers/cpufreq/intel_pstate.c5
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);
}