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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>
hifive-unleashed-5.1
Dirk Brandewie 2014-02-12 10:01:06 -08:00 committed by Rafael J. Wysocki
parent c3274763bf
commit 4042e7570c
1 changed files with 1 additions and 1 deletions
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2
drivers/cpufreq/intel_pstate.c
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@ -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)