Messages in this thread Patch in this message | | | From | dirk.brandewie@gmail ... | Subject | [PATCH v2] intel_pstate: Use LFM bus ratio as min ratio/P state | Date | Wed, 19 Feb 2014 10:35:25 -0800 |
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From: Dirk Brandewie <dirk.j.brandewie@intel.com>
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> --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index b80c03d..ff45ce1 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -356,7 +356,7 @@ 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) -- 1.8.3.1
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