[RFC 4/4] drm: Add NVIDIA Tegra support

[Thierry Reding]

* Alan Cox wrote:
> > Maybe your question is answered by my reply to Alan's comment. The mapping
> > is actually done to get a linear view for the display controller which
> > doesn't support SG transfers. The kernel and user-space already have virtual
> > linear buffers.
> 
> The framebuffer currently needs a physically contiguous map for the
> console devices. Well you could vmap them but that is pretty hideous on a
> 32bit platform with 32bit 1080p display plugged into it!

Heh, vmap() is exactly what I do. =) Would you mind explaining why exactly it
is hideous?

I'll have to investigate what an appropriate alternative would look like.

Thierry
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