Re: [PATCH] SCSI midlayer power management

[Pavel Machek]

Hi!

> > Ok, but what happens on next resume? If coherent mbox is at exactly
> > same place at every boot I guess it could even work, but...
> 
> Er, well this is a huge problem then.  Even if DMA were stopped, the
> registers for all these locations need to be altered to change the
> location of the DMA mboxes.  This isn't just a SCSI problem, it's a
> general device problem (most devices having mboxes programmed by
> register).  If we can't rely on the resuming kernel setting up these
> registers for us to exactly what they were in the resume image, then
> we're in a bit of trouble.
> 
> Architecturally what you are trying to do is to re POST the SCSI card. 
> Except it's the kernel's job to POST it, so the kernel init code needs
> to be re-run.  I assume that's what the pci suspend/resume calls are
> supposed to do?

Yes.
								Pavel

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