Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: System suspend states and device driver suspend() callback | Date | Sat, 17 Aug 2013 01:53:36 +0200 |
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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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