Re: System suspend states and device driver suspend() callback

[Li Yang-R58472]

在 2013-8-16，下午7:22，"Rafael J. Wysocki" <rjw@xxxxxxx> 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
> 
> 
韬{.n?????%?lzwm?b?Р骒r?zXЩ??{ay????j?f＂?????ア?⒎?:+v???????赙zZ+????"?!?O???v??m?鹈n?帼Y&—