From ed4676e254630c1f00a4fc8f3821890fff7e3643 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 19 Jul 2017 15:42:46 +0530 Subject: 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 Signed-off-by: Rafael J. Wysocki --- include/linux/cpufreq.h | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) (limited to 'include') 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; }; -- cgit v1.2.3