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authorViresh Kumar <viresh.kumar@linaro.org>2017-07-19 13:12:48 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-07-26 01:15:46 +0300
commitfe829ed8ef1f3c7ac22843bd594ef2f6c4044288 (patch)
tree2dedcb6914c8d28957e7488cbe337a7d9d021abe /drivers/cpufreq/elanfreq.c
parent560c6e452d8fa1e98cc50674d3408924387a983e (diff)
downloadlinux-fe829ed8ef1f3c7ac22843bd594ef2f6c4044288.tar.xz
cpufreq: Add CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING cpufreq driver flag
The policy->transition_latency field is used for multiple purposes today and its not straight forward at all. This is how it is used: A. Set the correct transition_latency value. B. Set it to CPUFREQ_ETERNAL because: 1. We don't want automatic dynamic switching (with ondemand/conservative) to happen at all. 2. We don't know the transition latency. This patch handles the B.1. case in a more readable way. A new flag for the cpufreq drivers is added to disallow use of cpufreq governors which have dynamic_switching flag set. All the current cpufreq drivers which are setting transition_latency unconditionally to CPUFREQ_ETERNAL are updated to use it. They don't need to set transition_latency anymore. There shouldn't be any functional change after this patch. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/elanfreq.c')
-rw-r--r--drivers/cpufreq/elanfreq.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/cpufreq/elanfreq.c b/drivers/cpufreq/elanfreq.c
index bfce11cba1df..45e2ca62515e 100644
--- a/drivers/cpufreq/elanfreq.c
+++ b/drivers/cpufreq/elanfreq.c
@@ -165,9 +165,6 @@ static int elanfreq_cpu_init(struct cpufreq_policy *policy)
if (pos->frequency > max_freq)
pos->frequency = CPUFREQ_ENTRY_INVALID;
- /* cpuinfo and default policy values */
- policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
-
return cpufreq_table_validate_and_show(policy, elanfreq_table);
}
@@ -196,6 +193,7 @@ __setup("elanfreq=", elanfreq_setup);
static struct cpufreq_driver elanfreq_driver = {
.get = elanfreq_get_cpu_frequency,
+ .flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = elanfreq_target,
.init = elanfreq_cpu_init,