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Date: Thu, 19 Dec 2013 11:53:29 +0000 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Joseph Salisbury <joseph.salisbury@...onical.com>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.11 111/208] intel_pstate: fix no_turbo 3.11.10.2 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> 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@...ux.intel.com> Acked-by: Dirk Brandewie <dirk.j.brandewie@...el.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Cc: Joseph Salisbury <joseph.salisbury@...onical.com> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- drivers/cpufreq/intel_pstate.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index e8c3db8..f112f7d 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); } -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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