diff options
| author | Ulf Hansson <ulf.hansson@linaro.org> | 2018-03-02 16:38:44 +0100 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-03-14 15:57:34 +0100 |
| commit | 2a58577023288876259322a1a2c250aa400cda1e (patch) | |
| tree | 92e6fccf0a8c6e457d3c9d50f2a4245b2a74cf36 | |
| parent | 2da8ed1fc2c2737e3fa6f78d5b8f6a51fefe65ea (diff) | |
kernel/cpu_pm: Manage runtime PM in the idle path for CPUs
To allow CPUs being power managed by PM domains, let's deploy support for
runtime PM for the CPU's corresponding struct device.
More precisely, at the point when the CPU is about to enter an idle state,
decrease the runtime PM usage count for its corresponding struct device,
via calling pm_runtime_put_sync_suspend(). Then, at the point when the CPU
resumes from idle, let's increase the runtime PM usage count, via calling
pm_runtime_get_sync().
Cc: Lina Iyer <ilina@codeaurora.org>
Co-developed-by: Lina Iyer <lina.iyer@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | kernel/cpu_pm.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c index 67b02e138a47..71317ffebb38 100644 --- a/kernel/cpu_pm.c +++ b/kernel/cpu_pm.c @@ -16,9 +16,11 @@ */ #include <linux/kernel.h> +#include <linux/cpu.h> #include <linux/cpu_pm.h> #include <linux/module.h> #include <linux/notifier.h> +#include <linux/pm_runtime.h> #include <linux/spinlock.h> #include <linux/syscore_ops.h> @@ -91,6 +93,7 @@ int cpu_pm_enter(void) { int nr_calls; int ret = 0; + struct device *dev = get_cpu_device(smp_processor_id()); ret = cpu_pm_notify(CPU_PM_ENTER, -1, &nr_calls); if (ret) @@ -100,6 +103,9 @@ int cpu_pm_enter(void) */ cpu_pm_notify(CPU_PM_ENTER_FAILED, nr_calls - 1, NULL); + if (!ret && dev) + pm_runtime_put_sync_suspend(dev); + return ret; } EXPORT_SYMBOL_GPL(cpu_pm_enter); @@ -118,6 +124,11 @@ EXPORT_SYMBOL_GPL(cpu_pm_enter); */ int cpu_pm_exit(void) { + struct device *dev = get_cpu_device(smp_processor_id()); + + if (dev) + pm_runtime_get_sync(dev); + return cpu_pm_notify(CPU_PM_EXIT, -1, NULL); } EXPORT_SYMBOL_GPL(cpu_pm_exit); |