This is a note to let you know that I've just added the patch titled
acpi-cpufreq: set current frequency based on target P-State
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-cpufreq-set-current-frequency-based-on-target-p-state.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8673b83bf2f013379453b4779047bf3c6ae387e4 Mon Sep 17 00:00:00 2001
From: Ross Lagerwall <rosslagerwall@xxxxxxxxx>
Date: Fri, 31 May 2013 20:45:17 +0100
Subject: acpi-cpufreq: set current frequency based on target P-State
From: Ross Lagerwall <rosslagerwall@xxxxxxxxx>
commit 8673b83bf2f013379453b4779047bf3c6ae387e4 upstream.
Commit 4b31e774 (Always set P-state on initialization) fixed bug
#4634 and caused the driver to always set the target P-State at
least once since the initial P-State may not be the desired one.
Commit 5a1c0228 (cpufreq: Avoid calling cpufreq driver's target()
routine if target_freq == policy->cur) caused a regression in
this behavior.
This fixes the regression by setting policy->cur based on the CPU's
target frequency rather than the CPU's current reported frequency
(which may be different). This means that the P-State will be set
initially if the CPU's target frequency is different from the
governor's target frequency.
This fixes an issue where setting the default governor to
performance wouldn't correctly enable turbo mode on all cores.
Signed-off-by: Ross Lagerwall <rosslagerwall@xxxxxxxxx>
Reviewed-by: Len Brown <len.brown@xxxxxxxxx>
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/acpi-cpufreq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -347,11 +347,11 @@ static u32 get_cur_val(const struct cpum
switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
case SYSTEM_INTEL_MSR_CAPABLE:
cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
- cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
+ cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
break;
case SYSTEM_AMD_MSR_CAPABLE:
cmd.type = SYSTEM_AMD_MSR_CAPABLE;
- cmd.addr.msr.reg = MSR_AMD_PERF_STATUS;
+ cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
break;
case SYSTEM_IO_CAPABLE:
cmd.type = SYSTEM_IO_CAPABLE;
Patches currently in stable-queue which might be from rosslagerwall@xxxxxxxxx are
queue-3.9/acpi-cpufreq-set-current-frequency-based-on-target-p-state.patch
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