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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-03-30 03:47:49 +0200 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-04-02 01:09:03 +0200 |
commit | b7898fda5bc7e786e76ce24fbd2ec993b08ec518 (patch) | |
tree | 2bf721763c79a7fe0eca25349a549c52ba6ce483 /drivers/cpufreq/Kconfig | |
parent | 379480d8258056bfdbaa65e4d3f024bb5b34b52b (diff) | |
download | linux-stable-b7898fda5bc7e786e76ce24fbd2ec993b08ec518.tar.gz linux-stable-b7898fda5bc7e786e76ce24fbd2ec993b08ec518.tar.bz2 linux-stable-b7898fda5bc7e786e76ce24fbd2ec993b08ec518.zip |
cpufreq: Support for fast frequency switching
Modify the ACPI cpufreq driver to provide a method for switching
CPU frequencies from interrupt context and update the cpufreq core
to support that method if available.
Introduce a new cpufreq driver callback, ->fast_switch, to be
invoked for frequency switching from interrupt context by (future)
governors supporting that feature via (new) helper function
cpufreq_driver_fast_switch().
Add two new policy flags, fast_switch_possible, to be set by the
cpufreq driver if fast frequency switching can be used for the
given policy and fast_switch_enabled, to be set by the governor
if it is going to use fast frequency switching for the given
policy. Also add a helper for setting the latter.
Since fast frequency switching is inherently incompatible with
cpufreq transition notifiers, make it possible to set the
fast_switch_enabled only if there are no transition notifiers
already registered and make the registration of new transition
notifiers fail if fast_switch_enabled is set for at least one
policy.
Implement the ->fast_switch callback in the ACPI cpufreq driver
and make it set fast_switch_possible during policy initialization
as appropriate.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/Kconfig')
0 files changed, 0 insertions, 0 deletions