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SubjectRe: System suspend states and device driver suspend() callback
Date
On Friday, August 16, 2013 05:13:42 PM Li Yang-R58472 wrote:
>
> 在 2013-8-16,下午7:22,"Rafael J. Wysocki" <rjw@sisk.pl> 写道:
>
> > On Friday, August 16, 2013 04:06:26 PM Li Yang wrote:
> >> Hi Guys,
> >>
> >> Is there a standard way for the device drivers to know if the system
> >> is going to “standby” mode or “mem” mode when the suspend() callbacks
> >> are called?
> >
> > No, there's none.
> >
> > What do you need that for?
>
> Some chips like ours are putting the on-chip devices into different low
> power states when entering different system low power states. When we enter
> system standby, on-chip devices are clock gated. While entering suspend to
> ram, on-chip devices are power gated. We want to driver to act differently
> too when entering different suspend states.

Can you possibly use platform suspend operations to implement that (in analogy
with ACPI suspend operations)?

Rafael

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