disabling vgaHW slow IO path

[Dave Airlie]

> > I've attached two patches, one for the vgaHW module that adds another
> > entry point to disable the behaviour and one for the intel driver
> > which to disable it if it finds the vgaHW symbol..
> >
> > I was tempted to just disable the ioport access on i386 as it is 2007
> > but maybe someone can point me at some hw that needs it..
>
> Why not do the reverse, and have it explicitly _enabled_?  Given that,
> up until 6.9, we weren't using this, but instead a delay loop that has
> been more or less meaningful for the last ten years due to clocks being
> drastically higher, I doubt there's much hardware that still relies on
> the ioport.
>

Okay screw it I went the other way, it just disables it and adds a new
API to put back the old behavour if someone is crazy enough to need
it. Can I push this?

Dave.
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