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Commit a6a73212 authored by Viresh Kumar's avatar Viresh Kumar Committed by Junjie Wu
Browse files

cpufreq: distinguish drivers that do asynchronous notifications 



There are few special cases like exynos5440 which doesn't send POSTCHANGE
notification from their ->target() routine and call some kind of bottom halves
for doing this work, work/tasklet/etc.. From which they finally send POSTCHANGE
notification.

Its better if we distinguish them from other cpufreq drivers in some way so that
core can handle them specially. So this patch introduces another flag:
CPUFREQ_ASYNC_NOTIFICATION, which will be set by such drivers.

This also changes exynos5440-cpufreq.c and powernow-k8 in order to set this
flag.

Acked-by: default avatarAmit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: default avatarKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Git-commit: 7dbf694db6ac7c759599316d50d7050efcbd512a
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[junjiew@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: default avatarJunjie Wu <junjiew@codeaurora.org>
parent 4d0f60f2

drivers/cpufreq/exynos5440-cpufreq.c

+1 −1
Original line number Diff line number Diff line
@@ -339,7 +339,7 @@ static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy) 
}



static struct cpufreq_driver exynos_driver = {

	.flags		= CPUFREQ_STICKY,

	.flags		= CPUFREQ_STICKY | CPUFREQ_ASYNC_NOTIFICATION,

	.verify		= exynos_verify_speed,

	.target		= exynos_target,

	.get		= exynos_getspeed,

drivers/cpufreq/powernow-k8.c

+1 −0
Original line number Diff line number Diff line
@@ -1233,6 +1233,7 @@ static struct freq_attr *powernow_k8_attr[] = { 
};



static struct cpufreq_driver cpufreq_amd64_driver = {

	.flags		= CPUFREQ_ASYNC_NOTIFICATION,

	.verify		= powernowk8_verify,

	.target		= powernowk8_target,

	.bios_limit	= acpi_processor_get_bios_limit,

include/linux/cpufreq.h

+7 −0
Original line number Diff line number Diff line
@@ -237,6 +237,13 @@ struct cpufreq_driver { 
 */

#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)



/*

 * Driver will do POSTCHANGE notifications from outside of their ->target()

 * routine and so must set cpufreq_driver->flags with this flag, so that core

 * can handle them specially.

 */

#define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)



int cpufreq_register_driver(struct cpufreq_driver *driver_data);

int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);