@@ -17,6 +17,7 @@
#include <linux/of.h>
#include <linux/cpufeature.h>
#include <linux/tick.h>
+#include <linux/pm_runtime.h>
#include "base.h"
@@ -344,6 +345,21 @@ static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
}
#endif
+#ifdef CONFIG_PM
+static void cpu_runtime_pm_init(struct device *dev)
+{
+ pm_runtime_irq_safe(dev);
+ pm_runtime_enable(dev);
+ if (cpu_online(dev->id)) {
+ pm_runtime_get_noresume(dev);
+ pm_runtime_set_active(dev);
+ }
+}
+#else
+static void cpu_runtime_pm_init(struct device *dev)
+{ }
+#endif
+
/*
* register_cpu - Setup a sysfs device for a CPU.
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
@@ -376,6 +392,8 @@ int register_cpu(struct cpu *cpu, int num)
if (!error)
register_cpu_under_node(num, cpu_to_node(num));
+ cpu_runtime_pm_init(&cpu->dev);
+
return error;
}
CPU devices just like any other device, can do runtime PM. However, CPU devices may only do runtime only when IRQs are disabled. The devices must be set as IRQ safe. Cc: Kevin Hilman <khilman@kernel.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> --- drivers/base/cpu.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html