This is a note to let you know that I've just added the patch titled
intel_pstate: Correct calculation of min pstate value
to the 3.10-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-correct-calculation-of-min-pstate-value.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7244cb62d96e735847dc9d08f870550df896898c Mon Sep 17 00:00:00 2001
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
Date: Mon, 21 Oct 2013 09:20:33 -0700
Subject: intel_pstate: Correct calculation of min pstate value
From: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
commit 7244cb62d96e735847dc9d08f870550df896898c upstream.
The minimum pstate is supposed to be a percentage of the maximum P
state available. Calculate min using max pstate and not the
current max which may have been limited by the user
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 | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -366,12 +366,13 @@ static int intel_pstate_turbo_pstate(voi
static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
{
int max_perf = cpu->pstate.turbo_pstate;
+ int max_perf_adj;
int min_perf;
if (limits.no_turbo)
max_perf = cpu->pstate.max_pstate;
- max_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
- *max = clamp_t(int, max_perf,
+ max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
+ *max = clamp_t(int, max_perf_adj,
cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf));
Patches currently in stable-queue which might be from dirk.j.brandewie@xxxxxxxxx are
queue-3.10/intel_pstate-fix-no_turbo.patch
queue-3.10/intel_pstate-add-haswell-cpu-models.patch
queue-3.10/intel_pstate-correct-calculation-of-min-pstate-value.patch
queue-3.10/intel_pstate-improve-accuracy-by-not-truncating-until-final-result.patch
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