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intel_pstate: fix no_turbo

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commit 1ccf7a1cda upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srinivas Pandruvada
2013-10-01 10:28:41 -07:00
committed by Greg Kroah-Hartman
parent 0b977de88f
commit 3dc642a398
1 changed files with 4 additions and 1 deletions
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5
drivers/cpufreq/intel_pstate.c
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@@ -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);
}