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intel_pstate: Add support for Baytrail turbo P states 

A documentation update exposed the existance of the turbo ratio
register. Update baytrail support to use the turbo range.

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>
This commit is contained in:
Dirk Brandewie 2014-02-12 10:01:07 -08:00 committed by Rafael J. Wysocki
parent 4042e7570c
commit 61d8d2abc1
1 changed files with 12 additions and 3 deletions
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15
drivers/cpufreq/intel_pstate.c
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@ -34,8 +34,10 @@
#define SAMPLE_COUNT 3
#define BYT_RATIOS 0x66a
#define BYT_VIDS 0x66b
#define BYT_RATIOS 0x66a
#define BYT_VIDS 0x66b
#define BYT_TURBO_RATIOS 0x66c
#define FRAC_BITS 8
#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
@ -367,6 +369,13 @@ static int byt_get_max_pstate(void)
return (value >> 16) & 0xFF;
}
static int byt_get_turbo_pstate(void)
{
u64 value;
rdmsrl(BYT_TURBO_RATIOS, value);
return value & 0x3F;
}
static void byt_set_pstate(struct cpudata *cpudata, int pstate)
{
u64 val;
@ -469,7 +478,7 @@ static struct cpu_defaults byt_params = {
.funcs = {
.get_max = byt_get_max_pstate,
.get_min = byt_get_min_pstate,
.get_turbo = byt_get_max_pstate,
.get_turbo = byt_get_turbo_pstate,
.set = byt_set_pstate,
.get_vid = byt_get_vid,
},