Messages in this thread | | | From | Li Yang-R58472 <> | Subject | Re: System suspend states and device driver suspend() callback | Date | Fri, 16 Aug 2013 17:13:42 +0000 |
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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.
- Leo
> > Rafael > >
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