intel_pstate: Fix BYT frequency reporting

BYT has a different conversion from P state to frequency than the core
processors.  This causes the min/max and current frequency to be
misreported on some BYT SKUs. Tested on BYT N2820, Ivybridge and
Haswell processors.

Link: https://bugzilla.yoctoproject.org/show_bug.cgi?id=6663
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 36 insertions, 6 deletions

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 97b349a6f5c7..98593e0344c5 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -64,6 +64,7 @@ struct pstate_data {
         int     current_pstate;
         int     min_pstate;
         int     max_pstate;
+        int     scaling;
         int     turbo_pstate;
 };
 
@@ -113,6 +114,7 @@ struct pstate_funcs {
         int (*get_max)(void);
         int (*get_min)(void);
         int (*get_turbo)(void);
+        int (*get_scaling)(void);
         void (*set)(struct cpudata*, int pstate);
         void (*get_vid)(struct cpudata *);
 };
@@ -433,6 +435,22 @@ static void byt_set_pstate(struct cpudata *cpudata, int pstate)
         wrmsrl(MSR_IA32_PERF_CTL, val);
 }
 
+#define BYT_BCLK_FREQS 5
+static int byt_freq_table[BYT_BCLK_FREQS] = { 833, 1000, 1333, 1167, 800};
+
+static int byt_get_scaling(void)
+{
+        u64 value;
+        int i;
+
+        rdmsrl(MSR_FSB_FREQ, value);
+        i = value & 0x3;
+
+        BUG_ON(i > BYT_BCLK_FREQS);
+
+        return byt_freq_table[i] * 100;
+}
+
 static void byt_get_vid(struct cpudata *cpudata)
 {
         u64 value;
@@ -478,6 +496,11 @@ static int core_get_turbo_pstate(void)
         return ret;
 }
 
+static inline int core_get_scaling(void)
+{
+        return 100000;
+}
+
 static void core_set_pstate(struct cpudata *cpudata, int pstate)
 {
         u64 val;
@@ -502,6 +525,7 @@ static struct cpu_defaults core_params = {
                 .get_max = core_get_max_pstate,
                 .get_min = core_get_min_pstate,
                 .get_turbo = core_get_turbo_pstate,
+                .get_scaling = core_get_scaling,
                 .set = core_set_pstate,
         },
 };
@@ -520,6 +544,7 @@ static struct cpu_defaults byt_params = {
                 .get_min = byt_get_min_pstate,
                 .get_turbo = byt_get_turbo_pstate,
                 .set = byt_set_pstate,
+                .get_scaling = byt_get_scaling,
                 .get_vid = byt_get_vid,
         },
 };
@@ -554,7 +579,7 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
         if (pstate == cpu->pstate.current_pstate)
                 return;
 
-        trace_cpu_frequency(pstate * 100000, cpu->cpu);
+        trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
 
         cpu->pstate.current_pstate = pstate;
 
@@ -566,6 +591,7 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
         cpu->pstate.min_pstate = pstate_funcs.get_min();
         cpu->pstate.max_pstate = pstate_funcs.get_max();
         cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
+        cpu->pstate.scaling = pstate_funcs.get_scaling();
 
         if (pstate_funcs.get_vid)
                 pstate_funcs.get_vid(cpu);
@@ -581,7 +607,9 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu)
         core_pct = div64_u64(core_pct, int_tofp(sample->mperf));
 
         sample->freq = fp_toint(
-                mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));
+                mul_fp(int_tofp(
+                        cpu->pstate.max_pstate * cpu->pstate.scaling / 100),
+                        core_pct));
 
         sample->core_pct_busy = (int32_t)core_pct;
 }
@@ -803,12 +831,13 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
         else
                 policy->policy = CPUFREQ_POLICY_POWERSAVE;
 
-        policy->min = cpu->pstate.min_pstate * 100000;
-        policy->max = cpu->pstate.turbo_pstate * 100000;
+        policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
+        policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
 
         /* cpuinfo and default policy values */
-        policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000;
-        policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000;
+        policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
+        policy->cpuinfo.max_freq =
+                cpu->pstate.turbo_pstate * cpu->pstate.scaling;
         policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
         cpumask_set_cpu(policy->cpu, policy->cpus);
 
@@ -866,6 +895,7 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs)
         pstate_funcs.get_max   = funcs->get_max;
         pstate_funcs.get_min   = funcs->get_min;
         pstate_funcs.get_turbo = funcs->get_turbo;
+        pstate_funcs.get_scaling = funcs->get_scaling;
         pstate_funcs.set       = funcs->set;
         pstate_funcs.get_vid   = funcs->get_vid;
 }