10.06.2021 14:04, Mikko Perttunen пишет:
Hi all,
here's the seventh revision of the TegraDRM UAPI proposal. Only some small changes to v6 here to fix things on older Tegras with certain configuration combinations, as well as rebasing to latest linux-next.
The following pieces of userspace have been updated to support this revision of the UAPI (unchanged from v6):
vaapi-tegra-driver - https://github.com/cyndis/vaapi-tegra-driver Experimental support for MPEG2 and H264 decoding on T210, T186 and T194.
xf86-video-opentegra - https://github.com/grate-driver/xf86-video-opentegra X11 userspace acceleration driver for Tegra20, Tegra30, and Tegra114.
grate - https://github.com/grate-driver/grate 3D rendering testbed for Tegra20, Tegra30, and Tegra114
The series can be also found in https://github.com/cyndis/linux/commits/work/tegradrm-v7.
The needs of the newer hardware are mostly understood now, so it's not the biggest problem now, which is good. The only part that is still not clear to me is whether sync points sharing is mandatory or optional since it's needed only by a proprietary monitoring software.
This is still not a full UAPI implementation and it's difficult for me to see how this will integrate with the DRM scheduler and etc.
I don't like that the new code is build upon the old troublesome codebase. The half of it will be removed later on and the other half will be reshuffled, which is a lot of effort that could be avoided. It's apparent to me that it should be much better if we could clean up the current code base first, but before doing it we need to agree on the organization of the updated driver, which should help a lot with moving forward.