cpufreq: Separate speed target revalidate time and initial set time

Allow speed drop after min_sample_time elapses from last time
the current speed was last re-validated as appropriate for
current load / input boost.

Allow speed bump after min_sample_time (or above_hispeed_delay)
elapses from the time the current speed was originally set.

Change-Id: Ic25687a7a53d25e6544c30c47d7ab6f27a47bee8
Signed-off-by: Todd Poynor <toddpoynor@google.com>

diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index 6a9f6c23ae642db4af5b4214cb97ba9a0bef4255..a57669abdc293c1d586877871b9de59d19aa9a44 100644 (file)
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -44,6 +44,8 @@ struct cpufreq_interactive_cpuinfo {
        int idling;
        u64 target_set_time;
        u64 target_set_time_in_idle;
+       u64 target_validate_time;
+       u64 target_validate_time_in_idle;
        struct cpufreq_policy *policy;
        struct cpufreq_frequency_table *freq_table;
        unsigned int target_freq;
@@ -209,10 +211,11 @@ static void cpufreq_interactive_timer(unsigned long data)
 
        /*
         * Do not scale down unless we have been at this frequency for the
-        * minimum sample time.
+        * minimum sample time since last validated.
         */
        if (new_freq < pcpu->target_freq) {
-               if (cputime64_sub(pcpu->timer_run_time, pcpu->target_set_time)
+               if (cputime64_sub(pcpu->timer_run_time,
+                                 pcpu->target_validate_time)
                    < min_sample_time) {
                        trace_cpufreq_interactive_notyet(data, cpu_load,
                                         pcpu->target_freq, new_freq);
@@ -220,8 +223,8 @@ static void cpufreq_interactive_timer(unsigned long data)
                }
        }
 
-       pcpu->target_set_time_in_idle = now_idle;
-       pcpu->target_set_time = pcpu->timer_run_time;
+       pcpu->target_validate_time_in_idle = now_idle;
+       pcpu->target_validate_time = pcpu->timer_run_time;
 
        if (pcpu->target_freq == new_freq) {
                trace_cpufreq_interactive_already(data, cpu_load,
@@ -231,6 +234,8 @@ static void cpufreq_interactive_timer(unsigned long data)
 
        trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq,
                                         new_freq);
+       pcpu->target_set_time_in_idle = now_idle;
+       pcpu->target_set_time = pcpu->timer_run_time;
 
        if (new_freq < pcpu->target_freq) {
                pcpu->target_freq = new_freq;
@@ -615,6 +620,10 @@ static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
                        pcpu->target_set_time_in_idle =
                                get_cpu_idle_time_us(j,
                                             &pcpu->target_set_time);
+                       pcpu->target_validate_time =
+                               pcpu->target_set_time;
+                       pcpu->target_validate_time_in_idle =
+                               pcpu->target_set_time_in_idle;
                        pcpu->governor_enabled = 1;
                        smp_wmb();
                }