Follow up of: http://lists.freedesktop.org/archives/dri-devel/2012-September/028278.html
Let's try again! This time, intead of a magic connector property to select if we want to return more modeinfo flags to userspace, this series introduces a new SET_CAP ioctl.
So the flow goes as following: 1/ the DRM client (limited to the DRM master) can notify it knows about those flags through SET_CAP 2/ we parse the HDMI CEA vendor blog for 3D_Present and patch the mandatory modes with the layouts they support (in ->flags) 3/ we can then handle a modeset with one (and only one) of those stereo 3D layout set on the mode. This includes writing a vendor infoframe with the information about the layout we're sending
libdrm patches will follow with a new drmSetCap() function and the stereo 3D flags.
Testing has been done with intel-gpu-tools' testdisplay that can now compose a left and right image for the "top and bottom", "side by side half" and "frame packing" stereo 3d layouts (patches posted on intel-gfx).