Messages in this thread | | | Date | Fri, 18 Feb 2011 10:05:52 -0500 (EST) | From | Alan Stern <> | Subject | Re: platform/i2c busses: pm runtime and system sleep |
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On Fri, 18 Feb 2011, Rabin Vincent wrote:
> How about something like the below? If we have something like this, we > can just switch platform to GENERIC_PM_OPS and add the > pm_runtime_want_interaction() (or something better named)
Yes, please find a better name! Maybe something starting with "generic_" to indicate that this applies only to devices using the GENERIC_PM_OPS.
> call to the > i2c and spi drivers using runtime PM.
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c > index 42615b4..2b8a099 100644 > --- a/drivers/base/power/runtime.c > +++ b/drivers/base/power/runtime.c > @@ -1069,6 +1069,30 @@ void pm_runtime_allow(struct device *dev) > EXPORT_SYMBOL_GPL(pm_runtime_allow); > > /** > + * pm_runtime_want_interaction - Enable interaction between system sleep > + * and runtime PM callbacks at the bus/subsystem > + * level. > + * @dev: Device to handle > + * > + * Set the power.want_interaction flage, which tells the generic PM subsystem > + * ops that the following actions should be done during system suspend/resume: > + * > + * - If the device has been runtime suspended, the driver's > + * suspend() handler will not be invoked. > + * > + * - If the device has a resume() pm callback, and the resume() > + * callback returns success on system resume, the device's > + * runtime PM status will be set to active. > + */
This last part is normally true for all devices. If you don't want it to hold when want_interaction isn't set, you should add a good explanation to sections 6 and 7 in Documentation/power/runtime.txt.
> +void pm_runtime_want_interaction(struct device *dev) > +{ > + spin_lock_irq(&dev->power.lock); > + dev->power.want_interaction = 1; > + spin_unlock_irq(&dev->power.lock); > +} > +EXPORT_SYMBOL_GPL(pm_runtime_want_interaction); > + > +/** > * pm_runtime_no_callbacks - Ignore run-time PM callbacks for a device. > * @dev: Device to handle. > *
Don't forget that you also need to describe these things in Documentation/power/runtime.txt.
Alan Stern
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