From: Srinivas Pandruvada Date: Tue, 1 Oct 2013 17:28:41 +0000 (-0700) Subject: intel_pstate: fix no_turbo X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=3dc642a3984abb4e34b7514a5d569a50402410b7;p=linux-edison.git intel_pstate: fix no_turbo commit 1ccf7a1cdafadd02e33e8f3d74370685a0600ec6 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 Acked-by: Dirk Brandewie Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 70163a0e8ae..ac3ff4d53ba 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); }