Re: Nested suspends; messages vs. states

Patrick Mochel
2005-03-24T17:00:14Z

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On Thu, 24 Mar 2005, David Brownell wrote:

> On Thursday 24 March 2005 7:48 am, Patrick Mochel wrote:

> > What about this "big sleep" and "deep sleep" stuff? What platform were
> > those for? Is there documentation about them?
>
> The terms apply at least to OMAP, and there's plenty of documentation
> for those chips. Look at the OMAP 5912 docs:
>
> http://focus.ti.com/omap/docs/omapgenpage.tsp?navigationId=12341&templateId=5663&path=templatedata/cm/omapproc/data/omap5912
>
> You'll have to register to get those (vs an NDA for an almost-identical
> version used inside cell phones -- yes, some Linux based ones too! -- which
> is one-big-PDF instead of lots of little one-per-chapter ones) and then
> the "Power Management" reference guide, SPRU753, talks about those details.

Thanks.

> Other platforms could use the same names differently of course. Capsule
> summary, "deep" means there's only a 32KHz clock, while "big" means the
> 48 MHz one is available to peripherals that need it (UARTs, USB, MMC/SD,
> camera, and so forth).

It sounds like they refer to low-power states in which the system is still
operating, which are distinct from the STD/STR/Standby that we're used to
that are non-operational low-power states. Is that correct?

Pat