[PATCH RFC v2 10/16] drivers: cpuidle: Add runtime PM support for CPUIdle
Lina Iyer
lina.iyer at linaro.org
Fri Jun 26 20:02:30 PDT 2015
Notify runtime PM when the CPU is going to be powered off in the idle
state. This allows for runtime PM suspend/resume of the CPU's PM domain.
Signed-off-by: Lina Iyer <lina.iyer at linaro.org>
---
drivers/cpuidle/cpuidle-arm.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
index 545069d..77fd673 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -11,12 +11,14 @@
#define pr_fmt(fmt) "CPUidle arm: " fmt
+#include <linux/cpu.h>
#include <linux/cpuidle.h>
#include <linux/cpumask.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <asm/cpuidle.h>
@@ -45,12 +47,20 @@ static int arm_enter_idle_state(struct cpuidle_device *dev,
ret = cpu_pm_enter();
if (!ret) {
+ struct device *cpu_dev = get_cpu_device(dev->cpu);
+
+ /*
+ * Notify runtime PM as well of this cpu powering down
+ * TODO: Merge CPU_PM and runtime PM.
+ */
+ pm_runtime_put_sync(cpu_dev);
/*
* Pass idle state index to cpu_suspend which in turn will
* call the CPU ops suspend protocol with idle index as a
* parameter.
*/
arm_cpuidle_suspend(idx);
+ pm_runtime_get_sync(cpu_dev);
cpu_pm_exit();
}
@@ -146,6 +156,7 @@ static int __init arm_idle_init(void)
kfree(dev);
goto out_fail;
}
+
}
return 0;
--
2.1.4
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