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authorViresh Kumar <viresh.kumar@linaro.org>2013-10-29 09:26:06 -0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-10-30 19:11:08 -0400
commit7dbf694db6ac7c759599316d50d7050efcbd512a (patch)
treefe10dc555181b52a8fd567dcf819d5a447bb1f37
parente0a261a207fb5bcbc6cc5db3b51a96d9cbe9b97e (diff)
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: Amit Daniel Kachhap <amit.daniel@samsung.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
-rw-r--r--drivers/cpufreq/exynos5440-cpufreq.c2
-rw-r--r--drivers/cpufreq/powernow-k8.c1
-rw-r--r--include/linux/cpufreq.h7
3 files changed, 9 insertions, 1 deletions
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
index 1bf9b060d522..76bef8b078cb 100644
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -312,7 +312,7 @@ static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
312} 312}
313 313
314static struct cpufreq_driver exynos_driver = { 314static struct cpufreq_driver exynos_driver = {
315 .flags = CPUFREQ_STICKY, 315 .flags = CPUFREQ_STICKY | CPUFREQ_ASYNC_NOTIFICATION,
316 .verify = cpufreq_generic_frequency_table_verify, 316 .verify = cpufreq_generic_frequency_table_verify,
317 .target_index = exynos_target, 317 .target_index = exynos_target,
318 .get = exynos_getspeed, 318 .get = exynos_getspeed,
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index 62a1ce47d3df..0023c7d40a51 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1204,6 +1204,7 @@ out:
1204} 1204}
1205 1205
1206static struct cpufreq_driver cpufreq_amd64_driver = { 1206static struct cpufreq_driver cpufreq_amd64_driver = {
1207 .flags = CPUFREQ_ASYNC_NOTIFICATION,
1207 .verify = cpufreq_generic_frequency_table_verify, 1208 .verify = cpufreq_generic_frequency_table_verify,
1208 .target_index = powernowk8_target, 1209 .target_index = powernowk8_target,
1209 .bios_limit = acpi_processor_get_bios_limit, 1210 .bios_limit = acpi_processor_get_bios_limit,
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 93a8c34d6c7f..5bd6ab9b0c27 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -237,6 +237,13 @@ struct cpufreq_driver {
237 */ 237 */
238#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3) 238#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
239 239
240/*
241 * Driver will do POSTCHANGE notifications from outside of their ->target()
242 * routine and so must set cpufreq_driver->flags with this flag, so that core
243 * can handle them specially.
244 */
245#define CPUFREQ_ASYNC_NOTIFICATION (1 << 4)
246
240int cpufreq_register_driver(struct cpufreq_driver *driver_data); 247int cpufreq_register_driver(struct cpufreq_driver *driver_data);
241int cpufreq_unregister_driver(struct cpufreq_driver *driver_data); 248int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
242 249