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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-05-05 00:51:54 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-05-07 01:49:28 +0200
commita6220fc19afc07fe77cfd16f5b8e568615517091 (patch)
tree1f79cd9dc6610db3ca394dcd4f61a3b109d1069d /include
parentbed4d597a0f99b380d24ab3a9da47b62cbf1ad0e (diff)
downloadop-kernel-dev-a6220fc19afc07fe77cfd16f5b8e568615517091.zip
op-kernel-dev-a6220fc19afc07fe77cfd16f5b8e568615517091.tar.gz
PM / suspend: Always use deepest C-state in the "freeze" sleep state
If freeze_enter() is called, we want to bypass the current cpuidle governor and always use the deepest available (that is, not disabled) C-state, because we want to save as much energy as reasonably possible then and runtime latency constraints don't matter at that point, since the system is in a sleep state anyway. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Aubrey Li <aubrey.li@linux.intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/cpuidle.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index a8d5bd3..c51a436 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -143,6 +143,7 @@ extern void cpuidle_resume(void);
extern int cpuidle_enable_device(struct cpuidle_device *dev);
extern void cpuidle_disable_device(struct cpuidle_device *dev);
extern int cpuidle_play_dead(void);
+extern void cpuidle_use_deepest_state(bool enable);
extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
#else
@@ -175,6 +176,7 @@ static inline int cpuidle_enable_device(struct cpuidle_device *dev)
{return -ENODEV; }
static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
static inline int cpuidle_play_dead(void) {return -ENODEV; }
+static inline void cpuidle_use_deepest_state(bool enable) {}
static inline struct cpuidle_driver *cpuidle_get_cpu_driver(
struct cpuidle_device *dev) {return NULL; }
#endif
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