cpufreq: governor: Simplify performance and powersave governors

The performance and powersave cpufreq governors handle the
CPUFREQ_GOV_START event in the same way as CPUFREQ_GOV_LIMITS.
However, the cpufreq core always invokes cpufreq_governor() with the
event argument equal to CPUFREQ_GOV_LIMITS right after invoking it with
event equal to CPUFREQ_GOV_START.  As a result, for both the governors
in question, __cpufreq_driver_target() is executed twice in a row
with the same arguments which is not useful.

For this reason, simplify the performance and powersave governors
to handle the CPUFREQ_GOV_LIMITS event only as that's going to be
sufficient for the governor start too.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/cpufreq_performance.c b/drivers/cpufreq/cpufreq_performance.c
index af9f4b9..dd4dca3 100644 (file)
--- a/drivers/cpufreq/cpufreq_performance.c
+++ b/drivers/cpufreq/cpufreq_performance.c
@@ -20,10 +20,8 @@ static int cpufreq_governor_performance(struct cpufreq_policy *policy,
                                        unsigned int event)
 {
        switch (event) {
-       case CPUFREQ_GOV_START:
        case CPUFREQ_GOV_LIMITS:
-               pr_debug("setting to %u kHz because of event %u\n",
-                                               policy->max, event);
+               pr_debug("setting to %u kHz\n", policy->max);
                __cpufreq_driver_target(policy, policy->max,
                                                CPUFREQ_RELATION_H);
                break;

diff --git a/drivers/cpufreq/cpufreq_powersave.c b/drivers/cpufreq/cpufreq_powersave.c
index b8b4002..691e573 100644 (file)
--- a/drivers/cpufreq/cpufreq_powersave.c
+++ b/drivers/cpufreq/cpufreq_powersave.c
@@ -20,10 +20,8 @@ static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
                                        unsigned int event)
 {
        switch (event) {
-       case CPUFREQ_GOV_START:
        case CPUFREQ_GOV_LIMITS:
-               pr_debug("setting to %u kHz because of event %u\n",
-                                                       policy->min, event);
+               pr_debug("setting to %u kHz\n", policy->min);
                __cpufreq_driver_target(policy, policy->min,
                                                CPUFREQ_RELATION_L);
                break;