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intel_pstate: Remove C0 tracking 

Commit fcb6a15c (intel_pstate: Take core C0 time into account for core
busy calculation) introduced a regression referenced below.  The issue
with "lockup" after suspend that this commit was addressing is now dealt
with in the suspend path.

Fixes: fcb6a15c2e (intel_pstate: Take core C0 time into account for core busy calculation)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=66581
Link: https://bugzilla.kernel.org/show_bug.cgi?id=75121
Reported-by: Doug Smythies <dsmythies@telus.net>
Cc: 3.14+ <stable@vger.kernel.org> # 3.14+
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 2014-05-29 09:32:22 -07:00 committed by Rafael J. Wysocki
parent fad01e866a
commit adacdf3f2b
1 changed files with 1 additions and 12 deletions
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13
drivers/cpufreq/intel_pstate.c
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@ -59,7 +59,6 @@ struct sample {
int32_t core_pct_busy;
u64 aperf;
u64 mperf;
unsigned long long tsc;
int freq;
};
@ -100,7 +99,6 @@ struct cpudata {
u64 prev_aperf;
u64 prev_mperf;
unsigned long long prev_tsc;
struct sample sample;
};
@ -561,46 +559,37 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu,
struct sample *sample)
{
int32_t core_pct;
int32_t c0_pct;
core_pct = div_fp(int_tofp((sample->aperf)),
int_tofp((sample->mperf)));
core_pct = mul_fp(core_pct, int_tofp(100));
FP_ROUNDUP(core_pct);
c0_pct = div_fp(int_tofp(sample->mperf), int_tofp(sample->tsc));
sample->freq = fp_toint(
mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));
sample->core_pct_busy = mul_fp(core_pct, c0_pct);
sample->core_pct_busy = core_pct;
}
static inline void intel_pstate_sample(struct cpudata *cpu)
{
u64 aperf, mperf;
unsigned long long tsc;
rdmsrl(MSR_IA32_APERF, aperf);
rdmsrl(MSR_IA32_MPERF, mperf);
tsc = native_read_tsc();
aperf = aperf >> FRAC_BITS;
mperf = mperf >> FRAC_BITS;
tsc = tsc >> FRAC_BITS;
cpu->sample.aperf = aperf;
cpu->sample.mperf = mperf;
cpu->sample.tsc = tsc;
cpu->sample.aperf -= cpu->prev_aperf;
cpu->sample.mperf -= cpu->prev_mperf;
cpu->sample.tsc -= cpu->prev_tsc;
intel_pstate_calc_busy(cpu, &cpu->sample);
cpu->prev_aperf = aperf;
cpu->prev_mperf = mperf;
cpu->prev_tsc = tsc;
}
static inline void intel_pstate_set_sample_time(struct cpudata *cpu)