On 07/25/2012 04:16 PM, Daniel Lezcano wrote:
The tegra3 and big.LITTLE architecture have different cpu latencies. This API allows to specify a different cpu latency for a specific cpu.
With the previous patches, we use the per cpuidle device states pointer, this function overrides this pointer.
May be add some more explanation and pointers to previous discussions, as stated on the cover in the patch series.
Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org
Acked-by: Deepthi Dharwar deepthi@linux.vnet.ibm.com
drivers/cpuidle/cpuidle.c | 17 +++++++++++++++++ include/linux/cpuidle.h | 10 +++++++--- 2 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 199878a..3b21b68 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -456,6 +456,23 @@ void cpuidle_unregister_device(struct cpuidle_device *dev)
EXPORT_SYMBOL_GPL(cpuidle_unregister_device);
+int cpuidle_register_states(struct cpuidle_device *dev,
struct cpuidle_state *states,int state_count)+{
- if (!dev || !states)
return -EINVAL;- if (state_count <= 0)
return -EINVAL;- dev->states = states;
- dev->state_count = state_count;
- return 0;
+} +EXPORT_SYMBOL_GPL(cpuidle_register_state);
#ifdef CONFIG_SMP
static void smp_callback(void *v) diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 40a04a1..425200d 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -144,7 +144,9 @@ extern void cpuidle_driver_unref(void); extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); extern int cpuidle_register_device(struct cpuidle_device *dev); extern void cpuidle_unregister_device(struct cpuidle_device *dev);
+extern int cpuidle_register_states(struct cpuidle_device *dev,
struct cpuidle_state *states,int state_count);extern void cpuidle_pause_and_lock(void); extern void cpuidle_resume_and_unlock(void); extern void cpuidle_pause(void); @@ -156,7 +158,6 @@ extern int cpuidle_wrap_enter(struct cpuidle_device *dev, int (*enter)(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index)); extern int cpuidle_play_dead(void);
#else static inline void disable_cpuidle(void) { } static inline int cpuidle_idle_call(void) { return -ENODEV; } @@ -169,7 +170,10 @@ static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } static inline int cpuidle_register_device(struct cpuidle_device *dev) {return -ENODEV; } static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { }
+static inline int cpuidle_register_states(struct cpuidle_device *dev,
struct cpuidle_state *states,int state_count)+{ return -ENODEV; } static inline void cpuidle_pause_and_lock(void) { } static inline void cpuidle_resume_and_unlock(void) { } static inline void cpuidle_pause(void) { }