Re: [PATCH v7 0/6] ZPODD patches

[David Woodhouse <dwmw2@infradead.org>]

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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?

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@intel.com                              Intel Corporation



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