Allwinner VPU support in mainline Linux status update (week 18)

This week, Paul continued working on DMABUF support and succeeded at exporting a buffer allocated by the Sunxi-Cedrus driver on the v4l2 side and importing it on the drm side via DMABUF. Although DMABUF support is still a work in progress in cedrus-frame-test and beyond the current level of support we have with GStreamer, the kernel side of things should be ready.

Another excerpt of the Big Buck Bunny video, in 1080p

Test coverage was also improved this week, with significantly more MPEG2 videos tested (including a standard DVD) in different resolutions up to 1080p. Some feedback from the community was also received and a first issue report will need to be investigated. Regarding platform support, initial testing of the A13 was undertaken. Although the VPU driver works apparently just as well on the A13 as already-tested platforms, the DRM driver adaptation (on the display side) for untiling VPU output buffers appears to be broken and will need to be further investigated.

In other news, a new version of the media request API has been submitted without the RFC tag (after 12 previous iterations). While we’ve been testing this new version along the course of its development, we are also taking the occasion to rebase our Sunxi-Cedrus VPU driver on top of this new version and take the received feedback into account.

Maxime continued the work on H264, and almost finished a first draft for the kernel driver side. Most of the code should be there now, the next steps are going to be making sure that no parts are missing and starting to test with cedrus-frame-test!

Author: Paul Kocialkowski

Paul is a kernel and embedded Linux intern at Bootlin. You can find more details about Paul on his personal website: http://www.paulk.fr/

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