cpuidle: Add a poll_idle method

Add a default poll idle state with 0 latency. Provides an option to users
to use poll_idle by using 0 as the latency requirement.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index b0fd85ab9efb..385d45b616db 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -46,9 +46,10 @@ struct cpuidle_state {
 /* Idle State Flags */
 #define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
 #define CPUIDLE_FLAG_CHECK_BM   (0x02) /* BM activity will exit state */
-#define CPUIDLE_FLAG_SHALLOW    (0x10) /* low latency, minimal savings */
-#define CPUIDLE_FLAG_BALANCED   (0x20) /* medium latency, moderate savings */
-#define CPUIDLE_FLAG_DEEP       (0x40) /* high latency, large savings */
+#define CPUIDLE_FLAG_POLL       (0x10) /* no latency, no savings */
+#define CPUIDLE_FLAG_SHALLOW    (0x20) /* low latency, minimal savings */
+#define CPUIDLE_FLAG_BALANCED   (0x40) /* medium latency, moderate savings */
+#define CPUIDLE_FLAG_DEEP       (0x80) /* high latency, large savings */
 
 #define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
 
@@ -178,4 +179,10 @@ static inline void cpuidle_unregister_governor(struct cpuidle_governor *gov) { }
 
 #endif
 
+#ifdef CONFIG_ARCH_HAS_CPU_RELAX
+#define CPUIDLE_DRIVER_STATE_START      1
+#else
+#define CPUIDLE_DRIVER_STATE_START      0
+#endif
+
 #endif /* _LINUX_CPUIDLE_H */