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.
Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Acked-by: Deepthi Dharwar deepthi@linux.vnet.ibm.com Acked-by: Peter De Schrijver pdeschrijver@nvidia.com Tested-by: Peter De Schrijver pdeschrijver@nvidia.com --- drivers/cpuidle/cpuidle.c | 21 +++++++++++++++++++++ include/linux/cpuidle.h | 10 +++++++--- 2 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 062f54e..ebb10c9 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -487,6 +487,27 @@ 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; + + cpuidle_pause_and_lock(); + + dev->states = states; + dev->state_count = state_count; + + cpuidle_resume_and_unlock(); + + return 0; +} +EXPORT_SYMBOL_GPL(cpuidle_register_states); + #ifdef CONFIG_SMP
static void smp_callback(void *v) diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 5cf18b5..85cabfd 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -151,7 +151,9 @@ 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); @@ -163,7 +165,6 @@ 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; } @@ -176,7 +177,10 @@ 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) { }