[PATCH v2 5/7] ARM: cpuidle: Add runtime PM support for CPU idle
From: Lina Iyer <hidden>
Date: 2015-09-03 19:58:32
Also in:
linux-arm-kernel
Subsystem:
cpu idle time management framework, the rest · Maintainers:
"Rafael J. Wysocki", Daniel Lezcano, Linus Torvalds
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 as well as its PM domain. Cc: Daniel Lezcano <redacted> Cc: Lorenzo Pieralisi <redacted> Signed-off-by: Lina Iyer <redacted> --- 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..7c791f9 100644
--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c@@ -11,13 +11,16 @@ #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 <linux/rcupdate.h> #include <asm/cpuidle.h>
@@ -37,6 +40,7 @@ static int arm_enter_idle_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx) { int ret; + struct device *cpu_dev = get_cpu_device(dev->cpu); if (!idx) { cpu_do_idle();
@@ -46,12 +50,19 @@ static int arm_enter_idle_state(struct cpuidle_device *dev, ret = cpu_pm_enter(); if (!ret) { /* + * Notify runtime PM as well of this cpu powering down + * TODO: Merge CPU_PM and runtime PM. + */ + RCU_NONIDLE(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); + RCU_NONIDLE(pm_runtime_get_sync(cpu_dev)); cpu_pm_exit(); }
--
2.1.4