RE: [PATCH v7 0/6] ZPODD patches

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> 
> On Wed, 2012-09-19 at 13:27 +0100, James Bottomley wrote:
> > I think we could do this with a couple of flags sitting inside struct
> > device itself: one for pm state and capabilities defined at a generic
> > level and one for device specific pm state.  The latter would be for
> > things like the door lock information which is very specific to CDs
> > (although not specific to SCSI CDs).  Alternatively, even if we can't
> > use these capabilities at the generic pm level, we still need an
> > internal state set of flags because power state stuff traverses the
> > stack and struct device is the only universal object in that stack.
> 
> FWIW the SATA Device Sleep support, which is currently only used (in a
> patch which is pending) automatically as an extension of the AHCI link
> power management, can also be triggered manually by a GPIO line; I've
> got a platform where it's done with an ACPI call. I suspect we'll see
> that kind of manual setup on a few embedded platforms too.
> 
> If we're working on hooking this up through the device layers, perhaps
> that's worth taking into consideration?
> 
> --

Hi David,

For SATA Device sleep, what's the appropriate time to set the Device sleep,
this seems also part of runtime PM?

Best regards!

Jack

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