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Subject[PATCH 3.13 118/172] intel_pstate: Use LFM bus ratio as min ratio/P state
Date
3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dirk Brandewie <dirk.j.brandewie@intel.com>

commit 4042e7570cff740460b75c6fc604c629621d3dd2 upstream.

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>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/cpufreq/intel_pstate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -348,7 +348,7 @@ 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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