cpufreq: governors: Get rid of dbs_data->enable field

CPUFREQ_GOV_START/STOP are called only once for all policy->cpus and hence we
don't need to adapt cpufreq_governor_dbs() routine for multiple calls.

So, this patch removes dbs_data->enable field entirely. And rearrange code a
bit.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 46f1c78..29d6a59 100644 (file)
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -182,6 +182,8 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
 {
        struct od_cpu_dbs_info_s *od_dbs_info = NULL;
        struct cs_cpu_dbs_info_s *cs_dbs_info = NULL;
+       struct cs_ops *cs_ops = NULL;
+       struct od_ops *od_ops = NULL;
        struct od_dbs_tuners *od_tuners = dbs_data->tuners;
        struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
        struct cpu_dbs_common_info *cpu_cdbs;
@@ -194,10 +196,12 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
                cs_dbs_info = dbs_data->get_cpu_dbs_info_s(cpu);
                sampling_rate = &cs_tuners->sampling_rate;
                ignore_nice = cs_tuners->ignore_nice;
+               cs_ops = dbs_data->gov_ops;
        } else {
                od_dbs_info = dbs_data->get_cpu_dbs_info_s(cpu);
                sampling_rate = &od_tuners->sampling_rate;
                ignore_nice = od_tuners->ignore_nice;
+               od_ops = dbs_data->gov_ops;
        }
 
        switch (event) {
@@ -207,10 +211,9 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
 
                mutex_lock(&dbs_data->mutex);
 
-               dbs_data->enable++;
                for_each_cpu(j, policy->cpus) {
-                       struct cpu_dbs_common_info *j_cdbs;
-                       j_cdbs = dbs_data->get_cpu_cdbs(j);
+                       struct cpu_dbs_common_info *j_cdbs =
+                               dbs_data->get_cpu_cdbs(j);
 
                        j_cdbs->cpu = j;
                        j_cdbs->cur_policy = policy;
@@ -225,13 +228,6 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
                                             dbs_data->gov_dbs_timer);
                }
 
-               /*
-                * Start the timerschedule work, when this governor is used for
-                * first time
-                */
-               if (dbs_data->enable != 1)
-                       goto second_time;
-
                rc = sysfs_create_group(cpufreq_global_kobject,
                                dbs_data->attr_group);
                if (rc) {
@@ -249,17 +245,19 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
                 * governor, thus we are bound to jiffes/HZ
                 */
                if (dbs_data->governor == GOV_CONSERVATIVE) {
-                       struct cs_ops *ops = dbs_data->gov_ops;
-
-                       cpufreq_register_notifier(ops->notifier_block,
+                       cs_dbs_info->down_skip = 0;
+                       cs_dbs_info->enable = 1;
+                       cs_dbs_info->requested_freq = policy->cur;
+                       cpufreq_register_notifier(cs_ops->notifier_block,
                                        CPUFREQ_TRANSITION_NOTIFIER);
 
                        dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
                                jiffies_to_usecs(10);
                } else {
-                       struct od_ops *ops = dbs_data->gov_ops;
-
-                       od_tuners->io_is_busy = ops->io_busy();
+                       od_dbs_info->rate_mult = 1;
+                       od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
+                       od_ops->powersave_bias_init_cpu(cpu);
+                       od_tuners->io_is_busy = od_ops->io_busy();
                }
 
                /* Bring kernel and HW constraints together */
@@ -267,18 +265,6 @@ int cpufreq_governor_dbs(struct dbs_data *dbs_data,
                                MIN_LATENCY_MULTIPLIER * latency);
                *sampling_rate = max(dbs_data->min_sampling_rate, latency *
                                LATENCY_MULTIPLIER);
-
-second_time:
-               if (dbs_data->governor == GOV_CONSERVATIVE) {
-                       cs_dbs_info->down_skip = 0;
-                       cs_dbs_info->enable = 1;
-                       cs_dbs_info->requested_freq = policy->cur;
-               } else {
-                       struct od_ops *ops = dbs_data->gov_ops;
-                       od_dbs_info->rate_mult = 1;
-                       od_dbs_info->sample_type = OD_NORMAL_SAMPLE;
-                       ops->powersave_bias_init_cpu(cpu);
-               }
                mutex_unlock(&dbs_data->mutex);
 
                /* Initiate timer time stamp */
@@ -297,16 +283,12 @@ second_time:
 
                mutex_lock(&dbs_data->mutex);
                mutex_destroy(&cpu_cdbs->timer_mutex);
-               dbs_data->enable--;
-               if (!dbs_data->enable) {
-                       struct cs_ops *ops = dbs_data->gov_ops;
-
-                       sysfs_remove_group(cpufreq_global_kobject,
-                                       dbs_data->attr_group);
-                       if (dbs_data->governor == GOV_CONSERVATIVE)
-                               cpufreq_unregister_notifier(ops->notifier_block,
-                                               CPUFREQ_TRANSITION_NOTIFIER);
-               }
+
+               sysfs_remove_group(cpufreq_global_kobject,
+                               dbs_data->attr_group);
+               if (dbs_data->governor == GOV_CONSERVATIVE)
+                       cpufreq_unregister_notifier(cs_ops->notifier_block,
+                                       CPUFREQ_TRANSITION_NOTIFIER);
                mutex_unlock(&dbs_data->mutex);
 
                break;

diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index b72e628..c19a16c 100644 (file)
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -130,7 +130,6 @@ struct dbs_data {
        #define GOV_CONSERVATIVE        1
        int governor;
        unsigned int min_sampling_rate;
-       unsigned int enable; /* number of CPUs using this policy */
        struct attribute_group *attr_group;
        void *tuners;