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authorDoug Smythies <doug.smythies@gmail.com>2015-06-01 21:12:34 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-10 02:08:27 +0200
commit6c1e45917dec5e7c99ba8125fd8cc50f6e482a21 (patch)
treeee9a465fc93905b7e3a4a51604d18c33fca01f60 /drivers/cpufreq
parentf16255eb930173f386db0ce78ed41401aa8a94a6 (diff)
downloadlinux-6c1e45917dec5e7c99ba8125fd8cc50f6e482a21.tar.bz2
intel_pstate: Force setting target pstate when required
During initialization and exit it is possible that the target pstate might not actually be set. Furthermore, the result can be that the driver and the processor are out of synch and, under some conditions, the driver might never send the processor the proper target pstate. This patch adds a bypass or do_checks flag to the call to intel_pstate_set_pstate. If bypass, then specifically bypass clamp checks and the do not send if it is the same as last time check. If do_checks, then, and as before, do the current policy clamp checks, and do not do actual send if the new target is the same as the old. Signed-off-by: Doug Smythies <dsmythies@telus.net> Reported-by: Marien Zwart <marien.zwart@gmail.com> Reported-by: Alex Lochmann <alexander.lochmann@tu-dortmund.de> Reported-by: Piotr Ko?aczkowski <pkolaczk@gmail.com> Reported-by: Clemens Eisserer <linuxhippy@gmail.com> Tested-by: Marien Zwart <marien.zwart@gmail.com> Tested-by: Doug Smythies <dsmythies@telus.net> [ rjw: Dropped pointless symbol definitions, rebased ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/intel_pstate.c21
1 files changed, 11 insertions, 10 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 2050796afd77..aef357203593 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -706,19 +706,20 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
*min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf);
}
-static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
+static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate, bool force)
{
int max_perf, min_perf;
- update_turbo_state();
-
- intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
+ if (force) {
+ update_turbo_state();
- pstate = clamp_t(int, pstate, min_perf, max_perf);
+ intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
- if (pstate == cpu->pstate.current_pstate)
- return;
+ pstate = clamp_t(int, pstate, min_perf, max_perf);
+ if (pstate == cpu->pstate.current_pstate)
+ return;
+ }
trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
cpu->pstate.current_pstate = pstate;
@@ -735,7 +736,7 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
if (pstate_funcs.get_vid)
pstate_funcs.get_vid(cpu);
- intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
+ intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false);
}
static inline void intel_pstate_calc_busy(struct cpudata *cpu)
@@ -855,7 +856,7 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
ctl = pid_calc(pid, busy_scaled);
/* Negative values of ctl increase the pstate and vice versa */
- intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl);
+ intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl, true);
sample = &cpu->sample;
trace_pstate_sample(fp_toint(sample->core_pct_busy),
@@ -1018,7 +1019,7 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
if (hwp_active)
return;
- intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate);
+ intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false);
}
static int intel_pstate_cpu_init(struct cpufreq_policy *policy)