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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>
This commit is contained in:
Viresh Kumar 2014-11-27 06:07:51 +05:30 committed by Rafael J. Wysocki
parent d3a10c1475
commit 7c45cf31b3
2 changed files with 9 additions and 0 deletions
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5
drivers/cpufreq/cpufreq.c
View File

@ -1285,8 +1285,13 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
up_write(&policy->rwsem); up_write(&policy->rwsem);
kobject_uevent(&policy->kobj, KOBJ_ADD); kobject_uevent(&policy->kobj, KOBJ_ADD);
up_read(&cpufreq_rwsem); 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"); pr_debug("initialization complete\n");
return 0; return 0;

4
include/linux/cpufreq.h
View File

@ -267,6 +267,10 @@ struct cpufreq_driver {
void (*stop_cpu)(struct cpufreq_policy *policy); void (*stop_cpu)(struct cpufreq_policy *policy);
int (*suspend)(struct cpufreq_policy *policy); int (*suspend)(struct cpufreq_policy *policy);
int (*resume)(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; struct freq_attr **attr;
/* platform specific boost support code */ /* platform specific boost support code */