Re: iommu breaks usb after resume

[Pavel Machek]

Hi!

> > On 64-bit machine with 4GB ram (8core from amd), iommu breaks USB
> > after swsusp. iommu=soft fixes that issue.
> > 
> > I guess iommu handling in arch/x86/kernel/ should have some
> > suspend/resume support, as it manipulates hardware registers...?
> 
> AGP suspend/resume should already handle restoring of the aperture
> and the IOMMU code uses the same.  It has not other state. It might not work 
> when the AGP driver is not compiled in/loaded though (I suspect
> that is what happened to you) One simple fix would be to just enforce
> that in Kconfig when suspend/resume is enabled.

I had:

CONFIG_AGP=y
CONFIG_AGP_AMD64=y
CONFIG_AGP_INTEL=y
# CONFIG_AGP_SIS is not set
CONFIG_AGP_VIA=y
CONFIG_DRM=y
# CONFIG_DRM_TDFX is not set

...do I need to enable something more?
									Pavel
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