intel_pstate: Add setting voltage value for baytrail P states.

Baytrail requires setting P state and voltage pairs when adjusting the
requested P state.  Add function for retrieving the valid voltage
values and modify *_set_pstate() functions to caluclate the
appropriate voltage for the requested P state.

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 5f1cbae369611062c18ee50982ffa5c6f724d30f..c84b280238a4aacf08980392f2ad8caff6abc6fe 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -35,6 +35,7 @@
 #define SAMPLE_COUNT           3
 
 #define BYT_RATIOS     0x66a
+#define BYT_VIDS        0x66b
 
 #define FRAC_BITS 8
 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
@@ -64,6 +65,12 @@ struct pstate_data {
        int     turbo_pstate;
 };
 
+struct vid_data {
+       int32_t min;
+       int32_t max;
+       int32_t ratio;
+};
+
 struct _pid {
        int setpoint;
        int32_t integral;
@@ -82,6 +89,7 @@ struct cpudata {
        struct timer_list timer;
 
        struct pstate_data pstate;
+       struct vid_data vid;
        struct _pid pid;
 
        int min_pstate_count;
@@ -106,7 +114,8 @@ struct pstate_funcs {
        int (*get_max)(void);
        int (*get_min)(void);
        int (*get_turbo)(void);
-       void (*set)(int pstate);
+       void (*set)(struct cpudata*, int pstate);
+       void (*get_vid)(struct cpudata *);
 };
 
 struct cpu_defaults {
@@ -358,6 +367,42 @@ static int byt_get_max_pstate(void)
        return (value >> 16) & 0xFF;
 }
 
+static void byt_set_pstate(struct cpudata *cpudata, int pstate)
+{
+       u64 val;
+       int32_t vid_fp;
+       u32 vid;
+
+       val = pstate << 8;
+       if (limits.no_turbo)
+               val |= (u64)1 << 32;
+
+       vid_fp = cpudata->vid.min + mul_fp(
+               int_tofp(pstate - cpudata->pstate.min_pstate),
+               cpudata->vid.ratio);
+
+       vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
+       vid = fp_toint(vid_fp);
+
+       val |= vid;
+
+       wrmsrl(MSR_IA32_PERF_CTL, val);
+}
+
+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.ratio = div_fp(
+               cpudata->vid.max - cpudata->vid.min,
+               int_tofp(cpudata->pstate.max_pstate -
+                       cpudata->pstate.min_pstate));
+}
+
+
 static int core_get_min_pstate(void)
 {
        u64 value;
@@ -384,7 +429,7 @@ static int core_get_turbo_pstate(void)
        return ret;
 }
 
-static void core_set_pstate(int pstate)
+static void core_set_pstate(struct cpudata *cpudata, int pstate)
 {
        u64 val;
 
@@ -425,7 +470,8 @@ static struct cpu_defaults byt_params = {
                .get_max = byt_get_max_pstate,
                .get_min = byt_get_min_pstate,
                .get_turbo = byt_get_max_pstate,
-               .set = core_set_pstate,
+               .set = byt_set_pstate,
+               .get_vid = byt_get_vid,
        },
 };
 
@@ -462,7 +508,7 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
 
        cpu->pstate.current_pstate = pstate;
 
-       pstate_funcs.set(pstate);
+       pstate_funcs.set(cpu, pstate);
 }
 
 static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
@@ -488,6 +534,9 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
        cpu->pstate.max_pstate = pstate_funcs.get_max();
        cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
 
+       if (pstate_funcs.get_vid)
+               pstate_funcs.get_vid(cpu);
+
        /*
         * goto max pstate so we don't slow up boot if we are built-in if we are
         * a module we will take care of it during normal operation
@@ -776,6 +825,7 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs)
        pstate_funcs.get_min   = funcs->get_min;
        pstate_funcs.get_turbo = funcs->get_turbo;
        pstate_funcs.set       = funcs->set;
+       pstate_funcs.get_vid   = funcs->get_vid;
 }
 
 #if IS_ENABLED(CONFIG_ACPI)