[Intel-gfx] [PATCH 19/24] drm/i915: detect digital outputs on Haswell

[Jesse Barnes]

On Mon, 30 Apr 2012 21:33:42 -0300
Eugeni Dodonov <eugeni at dodonov.net> wrote:

> On Mon, Apr 30, 2012 at 21:27, Jesse Barnes <jbarnes at virtuousgeek.org>wrote:
> 
> > We really really need to get the port detection working on HSW using
> > the VBT.
> >
> 
> It is not that easy from what I've seen. VBT can give some hints on which
> ports can support only DP or HDMI, but it does not answers all the cases.
> So the best solution seems to be running a DP AUX query when we got an
> output, and if it succeeds - it is a DP; otherwise, it is HDMI.
> 
> So my idea here is:
>  - add both HDMI and DP connectors for each available port (those we can
> get via VBT and from the GPU variant - some variants don't have specific
> DDIs in hardware, and VBT can further say which DDI are incapable of
> driving HDMI when present)
>  - add an intel_ddi_detect routine for .detect of each of them
>  - the intel_ddi_detect would try doing the DP AUX test, and dispatch
> either intel_hdmi_detect or intel_dp_detect accordingly.
> 
> Once the DP code will be ready, we'll put this in place. But for now, only
> HDMI works anyway, and I don't have any DP monitor around to play with :).
> 
> Does this looks reasonable?

I had wanted to avoid every HSW system looking like it had a bunch of
HDMI and DP ports, when it really only has one of each or something.

-- 
Jesse Barnes, Intel Open Source Technology Center