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authorViresh Kumar <viresh.kumar@linaro.org>2017-07-19 13:12:46 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-07-26 01:15:45 +0300
commited4676e254630c1f00a4fc8f3821890fff7e3643 (patch)
tree5cedac1abae32d5bbdde7585bbe915ff036c581c /include/linux/cpufreq.h
parent768608a578255c0add26bfdcb720d320eca1556b (diff)
downloadlinux-ed4676e254630c1f00a4fc8f3821890fff7e3643.tar.xz
cpufreq: Replace "max_transition_latency" with "dynamic_switching"
There is no limitation in the ondemand or conservative governors which disallow the transition_latency to be greater than 10 ms. The max_transition_latency field is rather used to disallow automatic dynamic frequency switching for platforms which didn't wanted these governors to run. Replace max_transition_latency with a boolean (dynamic_switching) and check for transition_latency == CPUFREQ_ETERNAL along with that. This makes it pretty straight forward to read/understand now. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/cpufreq.h')
-rw-r--r--include/linux/cpufreq.h9
1 files changed, 2 insertions, 7 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index aaadfc543f63..e141dbbb9d1c 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -487,12 +487,8 @@ static inline unsigned long cpufreq_scale(unsigned long old, u_int div,
* polling frequency is 1000 times the transition latency of the processor. The
* ondemand governor will work on any processor with transition latency <= 10ms,
* using appropriate sampling rate.
- *
- * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL)
- * the ondemand governor will not work. All times here are in us (microseconds).
*/
#define LATENCY_MULTIPLIER (1000)
-#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
struct cpufreq_governor {
char name[CPUFREQ_NAME_LEN];
@@ -505,9 +501,8 @@ struct cpufreq_governor {
char *buf);
int (*store_setspeed) (struct cpufreq_policy *policy,
unsigned int freq);
- unsigned int max_transition_latency; /* HW must be able to switch to
- next freq faster than this value in nano secs or we
- will fallback to performance governor */
+ /* For governors which change frequency dynamically by themselves */
+ bool dynamic_switching;
struct list_head governor_list;
struct module *owner;
};