[Bug 794840] display: drm: Remove PCI bus assumption when looking up the DRM device

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794840

--- Comment #5 from Paul Kocialkowski <paul.kocialkowski at bootlin.com> ---
(In reply to sreerenj from comment #3)
> I didn't know that there is ARM device using gstreamer-vaapi!
> 
> @Paul:
> I'm interested to know more about the use cases, platform or any details (if
> you can share) :)

The big picture here is that I'm adding support for the VPU found in Allwinner
platforms in mainline Linux. You can find details about the effort here:
https://linux-sunxi.org/Sunxi-Cedrus

Sofar, we have a libva implementation that handles the sunxi-cedrus mem2mem
V4L2 driver (that was submitted to linux-media, but is still in early stages).
Since our VPU is stateless, we have to rely on the Request API to synchronize
metadata with frame data, that is work in progress.

At this point, I'm hitting a segfault related to memory management (looks like
a double-free but I'm still debugging it). Note that I'm paulk-gagarine on
#gstreamer @freenode, so feel free to ping me if you'd like to chat about this!

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