cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET

Introduce a new governor flag, CPUFREQ_GOV_STRICT_TARGET, for the
governors that want the target frequency to be set exactly to the
given value without leaving any room for adjustments on the hardware
side and set this flag for the powersave and performance governors.

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 71c1d9aba77271957dbb3f4bccacbba9c20674d3..addd93f2a4202bb832053186ff8d9faf077c8f91 100644 (file)
--- a/drivers/cpufreq/cpufreq_performance.c
+++ b/drivers/cpufreq/cpufreq_performance.c
@@ -20,6 +20,7 @@ static void cpufreq_gov_performance_limits(struct cpufreq_policy *policy)
 static struct cpufreq_governor cpufreq_gov_performance = {
        .name           = "performance",
        .owner          = THIS_MODULE,
+       .flags          = CPUFREQ_GOV_STRICT_TARGET,
        .limits         = cpufreq_gov_performance_limits,
 };
 

diff --git a/drivers/cpufreq/cpufreq_powersave.c b/drivers/cpufreq/cpufreq_powersave.c
index 7749522355b5946914ac8099d58789a75729c1a2..8d830d860e9129baa02aaa6f384c433160a26f86 100644 (file)
--- a/drivers/cpufreq/cpufreq_powersave.c
+++ b/drivers/cpufreq/cpufreq_powersave.c
@@ -21,6 +21,7 @@ static struct cpufreq_governor cpufreq_gov_powersave = {
        .name           = "powersave",
        .limits         = cpufreq_gov_powersave_limits,
        .owner          = THIS_MODULE,
+       .flags          = CPUFREQ_GOV_STRICT_TARGET,
 };
 
 MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 9bdfcf3c4748221433f0d4fdd0d3c31af7cc88b0..6eb9a3b8ec7b0a715006b56e23c6cc07cc335cd3 100644 (file)
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -580,6 +580,9 @@ struct cpufreq_governor {
 /* For governors which change frequency dynamically by themselves */
 #define CPUFREQ_GOV_DYNAMIC_SWITCHING  BIT(0)
 
+/* For governors wanting the target frequency to be set exactly */
+#define CPUFREQ_GOV_STRICT_TARGET      BIT(1)
+
 
 /* Pass a target to the cpufreq driver */
 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,