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authorDirk Brandewie <dirk.j.brandewie@intel.com>2014-02-12 10:01:06 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-02-21 01:22:40 +0100
commit4042e7570cff740460b75c6fc604c629621d3dd2 (patch)
tree73378cf25bb76cc3685f71a779f1a3de8cd58ef1
parentc3274763bfc3bf1ececa269ed6e6c4d7ec1c3e5e (diff)
intel_pstate: Use LFM bus ratio as min ratio/P state
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@intel.com> Cc: 3.13+ <stable@vger.kernel.org> # 3.13+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/cpufreq/intel_pstate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index c788abf1c45..deb04cc64ba 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -357,7 +357,7 @@ 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)