[PATCH 1/2] PM: runtime: add devm_pm_runtime_enable helper

Dmitry Baryshkov
2021-07-27T21:04:00Z

Add helper function handling typical driver action: call
pm_runtime_enable at the probe() time and disable it during remove().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
drivers/base/power/runtime.c | 17 +++++++++++++++++
include/linux/pm_runtime.h | 4 ++++
2 files changed, 21 insertions(+)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 8a66eaf731e4..ec94049442b9 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1447,6 +1447,23 @@ void pm_runtime_enable(struct device *dev)
}
EXPORT_SYMBOL_GPL(pm_runtime_enable);

+static void pm_runtime_disable_action(void *data)
+{
+ pm_runtime_disable(data);
+}
+
+/**
+ * devm_pm_runtime_enable - devres-enabled version of pm_runtime_enable.
+ * @dev: Device to handle.
+ */
+int devm_pm_runtime_enable(struct device *dev)
+{
+ pm_runtime_enable(dev);
+
+ return devm_add_action_or_reset(dev, pm_runtime_disable_action, dev);
+}
+EXPORT_SYMBOL_GPL(devm_pm_runtime_enable);
+
/**
* pm_runtime_forbid - Block runtime PM of a device.
* @dev: Device to handle.
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index aab8b35e9f8a..222da43b7096 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -59,6 +59,8 @@ extern void pm_runtime_put_suppliers(struct device *dev);
extern void pm_runtime_new_link(struct device *dev);
extern void pm_runtime_drop_link(struct device_link *link);

+extern int devm_pm_runtime_enable(struct device *dev);
+
/**
* pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
* @dev: Target device.
@@ -253,6 +255,8 @@ static inline void __pm_runtime_disable(struct device *dev, bool c) {}
static inline void pm_runtime_allow(struct device *dev) {}
static inline void pm_runtime_forbid(struct device *dev) {}

+static inline int devm_pm_runtime_enable(struct device *dev) { return 0; }
+
static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
static inline void pm_runtime_get_noresume(struct device *dev) {}
static inline void pm_runtime_put_noidle(struct device *dev) {}
--
2.30.2