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| author | Dirk Brandewie <dirk.j.brandewie@intel.com> | 2014-02-12 10:01:06 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-02-21 01:22:40 +0100 |
| commit | 4042e7570cff740460b75c6fc604c629621d3dd2 (patch) | |
| tree | 73378cf25bb76cc3685f71a779f1a3de8cd58ef1 /drivers/cpufreq | |
| parent | c3274763bfc3bf1ececa269ed6e6c4d7ec1c3e5e (diff) | |
| download | linux-4042e7570cff740460b75c6fc604c629621d3dd2.tar.bz2 | |
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>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index c788abf1c457..deb04cc64ba1 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) |