RE: suspend/resume support for driver requires an external firmware

[Zhu, Yi]

Patrick Mochel wrote:
> I presume you're not talking about doing swsusp over NFS. If
> so, there's a lot more work to be done to teach the driver
> model and power management infrastructure about the
> dependencies involved to make that a possibility.
> It's safe to say that we don't support that, and won't
> support that at least for some time.

Then let's talk about S3 (suspend to ram), I think it should be
OK with a mounted NFS root, but the firmware issue is still there.

> As far as the firmware goes, there are two choices - reload
> it from userspace once we return or save it memory during
> suspend. I assume that these devices provide some means for
> reading the firmware from them, so you can just allocate a
> buffer and read it into that during the transition.

Agreed. I think now we need a clean interface that makes
drivers, swsusp or even the end user to work together to
finally achieve the goal.

Thanks,
-yi
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