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cpufreq / intel_pstate: Change to scale off of max P-state 

Change to using max P-state instead of max turbo P-state.  This
change resolves two issues.

On a quiet system intel_pstate can fail to respond to a load change.

On CPU SKUs that have a limited number of P-states and no turbo range
intel_pstate fails to select the highest available P-state.

This change is suitable for stable v3.9+

References: https://bugzilla.kernel.org/show_bug.cgi?id=59481
Reported-and-tested-by: Arjan van de Ven <arjan@linux.intel.com>
Reported-and-tested-by: dsmythies@telus.net
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dirk Brandewie 2013-07-18 08:48:42 -07:00 committed by Rafael J. Wysocki
parent 3b2f64d00c
commit 2134ed4d61
1 changed files with 6 additions and 6 deletions
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12
drivers/cpufreq/intel_pstate.c
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@ -103,10 +103,10 @@ struct pstate_adjust_policy {
static struct pstate_adjust_policy default_policy = {
.sample_rate_ms = 10,
.deadband = 0,
.setpoint = 109,
.p_gain_pct = 17,
.setpoint = 97,
.p_gain_pct = 20,
.d_gain_pct = 0,
.i_gain_pct = 4,
.i_gain_pct = 0,
};
struct perf_limits {
@ -468,12 +468,12 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
static inline int intel_pstate_get_scaled_busy(struct cpudata *cpu)
{
int32_t busy_scaled;
int32_t core_busy, turbo_pstate, current_pstate;
int32_t core_busy, max_pstate, current_pstate;
core_busy = int_tofp(cpu->samples[cpu->sample_ptr].core_pct_busy);
turbo_pstate = int_tofp(cpu->pstate.turbo_pstate);
max_pstate = int_tofp(cpu->pstate.max_pstate);
current_pstate = int_tofp(cpu->pstate.current_pstate);
busy_scaled = mul_fp(core_busy, div_fp(turbo_pstate, current_pstate));
busy_scaled = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
return fp_toint(busy_scaled);
}