1 files changed, 26 insertions, 23 deletions

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 125150dc6e81..23a8d6cc8d30 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -19,6 +19,7 @@
 #include <linux/ktime.h>
 #include <linux/hrtimer.h>
 #include <linux/module.h>
+#include <linux/suspend.h>
 #include <trace/events/power.h>
 
 #include "cpuidle.h"
@@ -32,7 +33,6 @@ LIST_HEAD(cpuidle_detected_devices);
 static int enabled_devices;
 static int off __read_mostly;
 static int initialized __read_mostly;
-static bool use_deepest_state __read_mostly;
 
 int cpuidle_disabled(void)
 {
@@ -66,24 +66,9 @@ int cpuidle_play_dead(void)
 }
 
 /**
- * cpuidle_use_deepest_state - Enable/disable the "deepest idle" mode.
- * @enable: Whether enable or disable the feature.
- *
- * If the "deepest idle" mode is enabled, cpuidle will ignore the governor and
- * always use the state with the greatest exit latency (out of the states that
- * are not disabled).
- *
- * This function can only be called after cpuidle_pause() to avoid races.
- */
-void cpuidle_use_deepest_state(bool enable)
-{
-        use_deepest_state = enable;
-}
-
-/**
- * cpuidle_find_deepest_state - Find the state of the greatest exit latency.
- * @drv: cpuidle driver for a given CPU.
- * @dev: cpuidle device for a given CPU.
+ * cpuidle_find_deepest_state - Find deepest state meeting specific conditions.
+ * @drv: cpuidle driver for the given CPU.
+ * @dev: cpuidle device for the given CPU.
  */
 static int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
                                       struct cpuidle_device *dev)
@@ -105,6 +90,27 @@ static int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
 }
 
 /**
+ * cpuidle_enter_freeze - Enter an idle state suitable for suspend-to-idle.
+ *
+ * Find the deepest state available and enter it.
+ */
+void cpuidle_enter_freeze(void)
+{
+        struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices);
+        struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
+        int index;
+
+        index = cpuidle_find_deepest_state(drv, dev);
+        if (index >= 0)
+                cpuidle_enter(drv, dev, index);
+        else
+                arch_cpu_idle();
+
+        /* Interrupts are enabled again here. */
+        local_irq_disable();
+}
+
+/**
  * cpuidle_enter_state - enter the state and update stats
  * @dev: cpuidle device for this cpu
  * @drv: cpuidle driver for this cpu
@@ -166,9 +172,6 @@ int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
         if (!drv || !dev || !dev->enabled)
                 return -EBUSY;
 
-        if (unlikely(use_deepest_state))
-                return cpuidle_find_deepest_state(drv, dev);
-
         return cpuidle_curr_governor->select(drv, dev);
 }
 
@@ -200,7 +203,7 @@ int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev,
  */
 void cpuidle_reflect(struct cpuidle_device *dev, int index)
 {
-        if (cpuidle_curr_governor->reflect && !unlikely(use_deepest_state))
+        if (cpuidle_curr_governor->reflect)
                 cpuidle_curr_governor->reflect(dev, index);
 }