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>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index deb04cc64ba12b7d0b2a5ca6390c51542561fb61..e908161059216b286123948d3de3405da450d3b8 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -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,
        },