This is a note to let you know that I've just added the patch titled
intel_pstate: Use LFM bus ratio as min ratio/P state
to the 3.13-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:
intel_pstate-use-lfm-bus-ratio-as-min-ratio-p-state.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4042e7570cff740460b75c6fc604c629621d3dd2 Mon Sep 17 00:00:00 2001
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Date: Wed, 12 Feb 2014 10:01:06 -0800
Subject: intel_pstate: Use LFM bus ratio as min ratio/P state
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
commit 4042e7570cff740460b75c6fc604c629621d3dd2 upstream.
LFM (max efficiency ratio) is the max frequency at minimum voltage
supported by the processor. Using LFM as the minimum P state
increases performmance without affecting power. By not using P states
below LFM we avoid using P states that are less power efficient.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/intel_pstate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -348,7 +348,7 @@ static int byt_get_min_pstate(void)
{
u64 value;
rdmsrl(BYT_RATIOS, value);
- return value & 0xFF;
+ return (value >> 8) & 0xFF;
}
static int byt_get_max_pstate(void)
Patches currently in stable-queue which might be from dirk.j.brandewie@xxxxxxxxx are
queue-3.13/intel_pstate-use-lfm-bus-ratio-as-min-ratio-p-state.patch
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