intel_pstate: Set turbo VID for BayTrail

A documentation update exposed that there is a separate set of VID
values that must be used in the turbo/boost P state range.  Add
enumerating and setting the correct VID for P states in the turbo
range.

Cc: v3.13+ <stable@vger.kernel.org> # v3.13+
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
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 099967302bf25939019875846f7819461a4805c2..39c4f85208487097ed1df131afd2db9c858fe1f7 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -37,6 +37,7 @@
 #define BYT_RATIOS             0x66a
 #define BYT_VIDS               0x66b
 #define BYT_TURBO_RATIOS       0x66c
+#define BYT_TURBO_VIDS         0x66d
 
 
 #define FRAC_BITS 6
@@ -70,8 +71,9 @@ struct pstate_data {
 };
 
 struct vid_data {
-       int32_t min;
-       int32_t max;
+       int min;
+       int max;
+       int turbo;
        int32_t ratio;
 };
 
@@ -359,14 +361,14 @@ static int byt_get_min_pstate(void)
 {
        u64 value;
        rdmsrl(BYT_RATIOS, value);
-       return (value >> 8) & 0xFF;
+       return (value >> 8) & 0x3F;
 }
 
 static int byt_get_max_pstate(void)
 {
        u64 value;
        rdmsrl(BYT_RATIOS, value);
-       return (value >> 16) & 0xFF;
+       return (value >> 16) & 0x3F;
 }
 
 static int byt_get_turbo_pstate(void)
@@ -393,6 +395,9 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate)
        vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
        vid = fp_toint(vid_fp);
 
+       if (pstate > cpudata->pstate.max_pstate)
+               vid = cpudata->vid.turbo;
+
        val |= vid;
 
        wrmsrl(MSR_IA32_PERF_CTL, val);
@@ -402,13 +407,17 @@ static void byt_get_vid(struct cpudata *cpudata)
 {
        u64 value;
 
+
        rdmsrl(BYT_VIDS, value);
-       cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
-       cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
+       cpudata->vid.min = int_tofp((value >> 8) & 0x3f);
+       cpudata->vid.max = int_tofp((value >> 16) & 0x3f);
        cpudata->vid.ratio = div_fp(
                cpudata->vid.max - cpudata->vid.min,
                int_tofp(cpudata->pstate.max_pstate -
                        cpudata->pstate.min_pstate));
+
+       rdmsrl(BYT_TURBO_VIDS, value);
+       cpudata->vid.turbo = value & 0x7f;
 }