Commit 7c45cf31 authored Nov 27, 2014 by Viresh Kumar Committed by Rafael J. Wysocki Nov 29, 2014

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>

parent d3a10c14

drivers/cpufreq/cpufreq.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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;

include/linux/cpufreq.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -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 */