diff options
| author | Viresh Kumar <viresh.kumar@linaro.org> | 2014-11-27 01:37:51 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-11-29 23:38:38 +0100 |
| commit | 7c45cf31b3ab9be270a7bf6af2926631dc566436 (patch) | |
| tree | 9d43ede2da036ce026785ec268e454b38dc9ac6f | |
| parent | cpufreq-dt: pass 'policy->related_cpus' to of_cpufreq_cooling_register() (diff) | |
| download | linux-7c45cf31b3ab9be270a7bf6af2926631dc566436.tar.xz linux-7c45cf31b3ab9be270a7bf6af2926631dc566436.zip | |
cpufreq: Introduce ->ready() callback for cpufreq drivers
Currently there is no callback for cpufreq drivers which is called once the
policy is ready to be used. There are some requirements where such a callback is
required.
One of them is registering a cooling device with the help of
of_cpufreq_cooling_register(). This routine tries to get 'struct cpufreq_policy'
for CPUs which isn't yet initialed at the time ->init() is called and so we face
issues while registering the cooling device.
Because we can't register cooling device from ->init(), we need a callback that
is called after the policy is ready to be used and hence we introduce ->ready()
callback.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Eduardo Valentin <edubezval@gmail.com>
Tested-by: Eduardo Valentin <edubezval@gmail.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 5 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 4 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index de2c3e198b62..a09a29c312a9 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1285,8 +1285,13 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) up_write(&policy->rwsem); kobject_uevent(&policy->kobj, KOBJ_ADD); + up_read(&cpufreq_rwsem); + /* Callback for handling stuff after policy is ready */ + if (cpufreq_driver->ready) + cpufreq_driver->ready(policy); + pr_debug("initialization complete\n"); return 0; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index db3c13085671..4d078cebafd2 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -267,6 +267,10 @@ struct cpufreq_driver { void (*stop_cpu)(struct cpufreq_policy *policy); int (*suspend)(struct cpufreq_policy *policy); int (*resume)(struct cpufreq_policy *policy); + + /* Will be called after the driver is fully initialized */ + void (*ready)(struct cpufreq_policy *policy); + struct freq_attr **attr; /* platform specific boost support code */ |