[RFC] radeon MST support - initial pieces

[Alex Deucher]

On Mon, Feb 23, 2015 at 6:23 PM, Dave Airlie <airlied at gmail.com> wrote:
> Hey,
>
> So I've had this work done for ages and gotten a bit stalled, it
> only kind off works, but I think I'm better sending it out for review
> and making getting some insight from AMD folks.
>
> It applies on top of the auxch native patch I've send already and
> Alex fixed up.
>
> It detects my 5k monitor and sees both halves, however for some
> reason one half is colored slighty different than the other, not sure
> what isn't getting loaded properly, also with an MST hub and DVI adapter
> I get some wierd mode timings that confuse one of my monitors at some
> resolutions, again not many ideas on why that is.
>
> Its hidden behind a radeon module option defauled to off for now.
>
> The 27" 5K imacs looks like they really want MST support.

Looks good.  I've applied it to my 4.1-wip tree to soak for a bit and
also added a few minor cleanups.

Alex