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 <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>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 70163a0..ac3ff4d 100644 (file)
--- 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);
 
 }