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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>
This commit is contained in:
Dirk Brandewie 2014-10-13 08:37:43 -07:00 committed by Rafael J. Wysocki
parent c034871712
commit b27580b05e
1 changed files with 36 additions and 6 deletions
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42
drivers/cpufreq/intel_pstate.c
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@ -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;
}