commit a06df062a189a8d5588babb8bf0bb78672497798
author Daniel Lezcano <daniel.lezcano@linaro.org> Wed Mar 27 10:22:10 2013 +0000
committer Rafael J. Wysocki <rafael.j.wysocki@intel.com> Mon Apr 01 01:10:28 2013 +0200
tree 356822486d2a63b2dae44fab5421578eef37b1f2
parent 4dbad816febb6cb7340e36af4f5c0dc86e55a2ca

cpuidle: initialize the broadcast timer framework

The commit 89878baa73f0f1c679355006bd8632e5d78f96c2 introduced
the CPUIDLE_FLAG_TIMER_STOP flag where we specify a specific idle
state stops the local timer.

Now use this flag to check at init time if one state will need
the broadcast timer and, in this case, setup the broadcast timer
framework. That prevents multiple code duplication in the drivers.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpuidle/driver.c

diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 422c7b6..8dfaaae 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -11,6 +11,8 @@
 #include <linux/mutex.h>
 #include <linux/module.h>
 #include <linux/cpuidle.h>
+#include <linux/cpumask.h>
+#include <linux/clockchips.h>
 
 #include "cpuidle.h"
 
@@ -19,9 +21,28 @@
 static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu);
 static struct cpuidle_driver * __cpuidle_get_cpu_driver(int cpu);
 
-static void __cpuidle_driver_init(struct cpuidle_driver *drv)
+static void cpuidle_setup_broadcast_timer(void *arg)
 {
+	int cpu = smp_processor_id();
+	clockevents_notify((long)(arg), &cpu);
+}
+
+static void __cpuidle_driver_init(struct cpuidle_driver *drv, int cpu)
+{
+	int i;
+
 	drv->refcnt = 0;
+
+	for (i = drv->state_count - 1; i >= 0 ; i--) {
+
+		if (!(drv->states[i].flags & CPUIDLE_FLAG_TIMER_STOP))
+			continue;
+
+		drv->bctimer = 1;
+		on_each_cpu_mask(get_cpu_mask(cpu), cpuidle_setup_broadcast_timer,
+				 (void *)CLOCK_EVT_NOTIFY_BROADCAST_ON, 1);
+		break;
+	}
 }
 
 static int __cpuidle_register_driver(struct cpuidle_driver *drv, int cpu)
@@ -35,7 +56,7 @@
 	if (__cpuidle_get_cpu_driver(cpu))
 		return -EBUSY;
 
-	__cpuidle_driver_init(drv);
+	__cpuidle_driver_init(drv, cpu);
 
 	__cpuidle_set_cpu_driver(drv, cpu);
 
@@ -49,6 +70,12 @@
 
 	if (!WARN_ON(drv->refcnt > 0))
 		__cpuidle_set_cpu_driver(NULL, cpu);
+
+	if (drv->bctimer) {
+		drv->bctimer = 0;
+		on_each_cpu_mask(get_cpu_mask(cpu), cpuidle_setup_broadcast_timer,
+				 (void *)CLOCK_EVT_NOTIFY_BROADCAST_OFF, 1);
+	}
 }
 
 #ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS