suspend-to-mem on the mpc8349e-mitx-gp?

[Li Yang-R58472]

> -----Original Message-----
> From: Wood Scott-B07421 
> Sent: Friday, March 20, 2009 10:42 PM
> To: Li Yang-R58472
> Cc: Soohyung Cho; linuxppc-dev at ozlabs.org
> Subject: Re: suspend-to-mem on the mpc8349e-mitx-gp?
> 
> Li Yang-R58472 wrote:
> >> However, the code should treat "mem" as "standby" on chips 
> that don't 
> >> support deep sleep.  What does the device tree
> > 
> > Well, shouldn't the valid() callback reject unsupported 
> states instead 
> > of covering up?
> 
> I don't think so, in this case.  The user is not asking for 
> "sleep" or deep sleep"; they are asking for a power state 
> that meets the definition of "standby" (which sleep does) or 
> which meets the definition of "mem" 
> (which both sleep and deep sleep do).  When the user asks for 
> "mem", we provide the lowest power mode that qualifies.

In my understanding, "mem" which is suspend-to-ram means all CPU states and registers are kept in memory and the CPU is completely off during suspension.  I don't think the sleep mode of 8349 qualifies, does it?

- Leo