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Commit 2134ed4d authored by Dirk Brandewie's avatar Dirk Brandewie Committed by Rafael J. Wysocki
Browse files

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: default avatarArjan van de Ven <arjan@linux.intel.com>
Reported-and-tested-by: default avatar <dsmythies@telus.net>
Signed-off-by: default avatarDirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 3b2f64d0

drivers/cpufreq/intel_pstate.c

+6 −6
Original line number Diff line number Diff line
@@ -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);

}