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Commit 45cac118 authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Rafael J. Wysocki
Browse files

cpufreq: arm_big_little: reconfigure switcher behavior at run time 



The b.L switcher can be turned on/off at run time.  It is therefore
necessary to change the cpufreq driver behavior accordingly.

The driver must be unregistered/registered with the cpufreq core
to reconfigure freq tables for the virtual or actual CPUs. This is
accomplished via the b.L switcher notifier callback.

Signed-off-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e79a23c5

drivers/cpufreq/arm_big_little.c

+51 −3
Original line number Diff line number Diff line
@@ -40,9 +40,12 @@ 
#define MAX_CLUSTERS	2



#ifdef CONFIG_BL_SWITCHER

#define is_bL_switching_enabled()	true

static bool bL_switching_enabled;

#define is_bL_switching_enabled()	bL_switching_enabled

#define set_switching_enabled(x)	(bL_switching_enabled = (x))

#else

#define is_bL_switching_enabled()	false

#define set_switching_enabled(x)	do { } while (0)

#endif



#define ACTUAL_FREQ(cluster, freq)  ((cluster == A7_CLUSTER) ? freq << 1 : freq)
@@ -508,6 +511,38 @@ static struct cpufreq_driver bL_cpufreq_driver = { 
	.attr			= cpufreq_generic_attr,

};



static int bL_cpufreq_switcher_notifier(struct notifier_block *nfb,

					unsigned long action, void *_arg)

{

	pr_debug("%s: action: %ld\n", __func__, action);



	switch (action) {

	case BL_NOTIFY_PRE_ENABLE:

	case BL_NOTIFY_PRE_DISABLE:

		cpufreq_unregister_driver(&bL_cpufreq_driver);

		break;



	case BL_NOTIFY_POST_ENABLE:

		set_switching_enabled(true);

		cpufreq_register_driver(&bL_cpufreq_driver);

		break;



	case BL_NOTIFY_POST_DISABLE:

		set_switching_enabled(false);

		cpufreq_register_driver(&bL_cpufreq_driver);

		break;



	default:

		return NOTIFY_DONE;

	}



	return NOTIFY_OK;

}



static struct notifier_block bL_switcher_notifier = {

	.notifier_call = bL_cpufreq_switcher_notifier,

};



int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)

{

	int ret, i;
@@ -525,6 +560,9 @@ int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops) 


	arm_bL_ops = ops;



	ret = bL_switcher_get_enabled();

	set_switching_enabled(ret);



	for (i = 0; i < MAX_CLUSTERS; i++)

		mutex_init(&cluster_lock[i]);
@@ -534,10 +572,17 @@ int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops) 
				__func__, ops->name, ret);

		arm_bL_ops = NULL;

	} else {

		pr_info("%s: Registered platform driver: %s\n", __func__,

				ops->name);

		ret = bL_switcher_register_notifier(&bL_switcher_notifier);

		if (ret) {

			cpufreq_unregister_driver(&bL_cpufreq_driver);

			arm_bL_ops = NULL;

		} else {

			pr_info("%s: Registered platform driver: %s\n",

					__func__, ops->name);

		}

	}



	bL_switcher_put_enabled();

	return ret;

}

EXPORT_SYMBOL_GPL(bL_cpufreq_register);
@@ -550,7 +595,10 @@ void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops) 
		return;

	}



	bL_switcher_get_enabled();

	bL_switcher_unregister_notifier(&bL_switcher_notifier);

	cpufreq_unregister_driver(&bL_cpufreq_driver);

	bL_switcher_put_enabled();

	pr_info("%s: Un-registered platform driver: %s\n", __func__,

			arm_bL_ops->name);

	arm_bL_ops = NULL;