[CC list trimmed + added Kevin Hilman]
On Monday, October 20, 2014 11:04:44 AM Krzysztof Kozlowski wrote:
> Add a simple getter pm_runtime_is_irq_safe() for querying whether runtime
> PM IRQ safe was set or not.
>
> Various bus drivers implementing runtime PM may use choose to suspend
> differently based on IRQ safeness status of child driver (e.g. do not
> unprepare the clock if IRQ safe is not set).
>
> Signed-off-by: Krzysztof Kozlowski <[email protected]>
> Reviewed-by: Ulf Hansson <[email protected]>
So why do we need to add the wrapper?
And it goes kind of against the intention which was to set irq_safe when
we knew that the callbacks were safe to be executed from interrupt context
and not when we wished that to be the case.
> ---
> Documentation/power/runtime_pm.txt | 4 ++++
> include/linux/pm_runtime.h | 6 ++++++
> 2 files changed, 10 insertions(+)
>
> diff --git a/Documentation/power/runtime_pm.txt
> b/Documentation/power/runtime_pm.txt
> index f32ce5419573..397b81593142 100644
> --- a/Documentation/power/runtime_pm.txt
> +++ b/Documentation/power/runtime_pm.txt
> @@ -468,6 +468,10 @@ drivers/base/power/runtime.c and
> include/linux/pm_runtime.h:
> - set the power.irq_safe flag for the device, causing the runtime-PM
> callbacks to be invoked with interrupts off
>
> + bool pm_runtime_is_irq_safe(struct device *dev);
> + - return true if power.irq_safe flag was set for the device, causing
> + the runtime-PM callbacks to be invoked with interrupts off
> +
> void pm_runtime_mark_last_busy(struct device *dev);
> - set the power.last_busy field to the current time
>
> diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> index 367f49b9a1c9..44d74f0f182e 100644
> --- a/include/linux/pm_runtime.h
> +++ b/include/linux/pm_runtime.h
> @@ -128,6 +128,11 @@ static inline void pm_runtime_mark_last_busy(struct
> device *dev)
> ACCESS_ONCE(dev->power.last_busy) = jiffies;
> }
>
> +static inline bool pm_runtime_is_irq_safe(struct device *dev)
> +{
> + return dev->power.irq_safe;
> +}
> +
> #else /* !CONFIG_PM_RUNTIME */
>
> static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
> @@ -167,6 +172,7 @@ static inline bool pm_runtime_enabled(struct device *dev)
> { return false; }
>
> static inline void pm_runtime_no_callbacks(struct device *dev) {}
> static inline void pm_runtime_irq_safe(struct device *dev) {}
> +static inline bool pm_runtime_is_irq_safe(struct device *dev) { return
> false; }
>
> static inline bool pm_runtime_callbacks_present(struct device *dev) { return
> false; }
> static inline void pm_runtime_mark_last_busy(struct device *dev) {}
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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