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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2017-07-19 13:12:48 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-26 01:15:46 +0300 |
| commit | fe829ed8ef1f3c7ac22843bd594ef2f6c4044288 (patch) | |
| tree | 2dedcb6914c8d28957e7488cbe337a7d9d021abe /drivers/cpufreq/cpufreq.c | |
| parent | 560c6e452d8fa1e98cc50674d3408924387a983e (diff) | |
| download | linux-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/cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 88139e5e87da..6ec589c048b2 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2005,11 +2005,12 @@ static int cpufreq_init_governor(struct cpufreq_policy *policy) /* Platform doesn't want dynamic frequency switching ? */ if (policy->governor->dynamic_switching && - policy->cpuinfo.transition_latency == CPUFREQ_ETERNAL) { + (cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING || + policy->cpuinfo.transition_latency == CPUFREQ_ETERNAL)) { struct cpufreq_governor *gov = cpufreq_fallback_governor(); if (gov) { - pr_warn("Transition latency set to CPUFREQ_ETERNAL, can't use %s governor. Fallback to %s governor\n", + pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n", policy->governor->name, gov->name); policy->governor = gov; } else { |