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intel_pstate: Use LFM bus ratio as min ratio/P state
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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>
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Dirk Brandewie authored and Rafael J. Wysocki committed Feb 21, 2014
1 parent c327476 commit 4042e75
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion drivers/cpufreq/intel_pstate.c
Original file line number Diff line number Diff line change
Expand Up @@ -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)
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