[Nouveau] [PATCH v2 00/10] Enable HDMI Stereoscopy

[Ilia Mirkin]

On Wed, Mar 29, 2017 at 10:24 AM, Alastair Bridgewater
<alastair.bridgewater at gmail.com> wrote:
> On Wed, Mar 29, 2017 at 8:02 AM, Ville Syrjälä
> <ville.syrjala at linux.intel.com> wrote:
>>
>> On Mon, Mar 27, 2017 at 05:57:57PM -0400, Alastair Bridgewater wrote:
>> > And the tenth patch enables stereo mode support...  on HDMI and DPort
>> > connectors on nv50+ hardware.  HDMI connectors because obvious.  DPort
>> > connectors because of DPort to HDMI adaptors.
>>
>> Do you mean DP++ or actual protocol converters? DP++ is just HDMI with
>> a some electrical tweaks, but IIRC proper DP defines 3D stereo quite
>> differently than HDMI. I'm not sure if we should be able to push HDMI
>> style 3D through DP->HDMI/DP++ adaptors. The specs are unfortunately
>> very vague when it comes to such devices.
>
> DP++. Good point about the protocol converters, though I don't recall
> seeing any way to distinguish between a DP and a DP++ connector in
> nouveau, nor do I know if nVidia actually made any boards with DP that
> isn't DP++. I guess I have some digging to do in that direction. Thank
> you.

I wouldn't be surprised if the externally-encodered G200 DP connectors
didn't support DP++. I do think that the vast majority of DP ports are
actually DP++ (on NVIDIA, and probably everywhere). However since this
is (edge case)^2 [G200 DP, 3D DP], I wouldn't spend too much time
worrying about it. I doubt it's documented anywhere, and equally
doubtful any such sinks exist. Should be able to find a VBIOS with the
external DP encoders though, and you can check the DCB specs that
NVIDIA published at
ftp://download.nvidia.com/open-gpu-doc/DCB/2/DCB-4.x-Specification.html.
(Looks like there is something there under "DFP Specific Information"
-> HDMI, not 100% sure where in nouveau it's decoded though.)