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skip to content bootlin embedded linux and kernel engineering menu home engineering training docs community company allwinner vpu support in mainline linux status update (week 30) this week’s progress in our vpu driver development effort was focused on two main tasks: submitting the sixth revision of the cedrus vpu driver series to the mainline linux kernel and starting the work on h265 decoding. the patch series for this new iteration of the driver was submitted on wednesday and contains both functional and cosmetic changes. most notably, we implemented support for video-specific quantization matrices in mpeg2, one of the final extension bits we were missing until then, but also cleaned up the register definitions for the driver. at this point, there are no undocumented registers or fields left, which makes the overall understanding of the hardware interactions much more straightforward. the driver was also moved to staging drivers, not because it was deemed of poor quality but rather because v4l2 maintainers want to keep the ability to change the controls that our driver is using even after it is merged. aside of this work, we started looking into h265 decoding, that was also already implemented in libvdpau-sunxi for the downstream modified version of the linux kernel provided by allwinner for the h3 (still based on linux 3.4 to this day, which was released in 2012). after setting up a board with this kernel and libvdpau-sunxi, we were able to dump the register access made by libvdpau-sunxi, providing a reference for bringing up h265 support in the cedrus vpu driver! author paul kocialkowski posted on july 27, 2018 categories technical tags allwinner , kickstarter , vpu leave a comment on allwinner vpu support in mainline linux status update (week 30) delivery of allwinner vpu driver main goals with a few weeks of delay, we are proud to announce the delivery of the main goals of our crowdfunding campaign dedicated at adding upstream linux support for the allwinner video decoding hardware. after several months of hard work by bootlin engineer maxime ripard and intern paul kocialkowski, we now have a working demo of kodi running with our vpu driver on top of a mainline 4.18-rc kernel. both mpeg2 and h264 are supported, with a fully-optimized pipeline between the vpu and the display side that does not involve any buffer copy or extra transformation that the hardware cannot offload. these results were possible thanks to the previous efforts carried out by the linux-sunxi community, and especially the libvdpau-sunxi project. the cedrus vpu driver running on the a33 and h3 here were the main goals defined in our crowdfunding campaign, which we promised to deliver end of june 2018, and their status in our delivery: making sure that the codec works on the older allwinner socs: a10, a13, a20, a33, r8 and r16. . this goal is fully met, with more features than planned: the cedrus driver was brought up on the a10, a13, a20, a33 and h3. therefore, we included h3 support in this delivery, even though it was originally only part of one of the stretch goals. the r8 is the same as an a13 and the r16 is the same as an a33, so they are supported as well. polishing the existing mpeg2 decoding support to make it fully production ready . this goal is fully met: we have done much more testing of the mpeg2 decoding, and both the linux kernel code and user-space code supporting mpeg2 has been significantly improved and cleaned up. implementing h264 video decoding, since h264 is by far one of the most popular video codec. . this goal is fully met: h264 decoding support has been added to both the linux kernel driver and the user-space library, including high-profile h264 support. however, the h264 support is still very recent and we expect that additional debugging and improvements will be needed. modifying the allwinner display driver in order to be able to directly display the decoded frames instead of converting and copying those frames . this goal is fully met: the allwinner drm driver has received a number of patches to ensure we can use one of the several planes to directly display the video frames in the format provided by the vpu. support for hardware scaling has also been fixed to work properly. those patches have already been contributed to the upstream linux kernel. the work on the a20 and a33 display driver was done by bootlin, while the work on the h3 was done by other developers of the community. providing a user-space library easy to integrate in the popular open-source video players . this goal is partially met: while we are providing a libva-v4l2-request user-space libraries that can in theory be used by all libva capable video players, the actual integration with video players is for now only working completely with kodi. we have started efforts to make it work with both vlc and gstreamer, but the work has not been complete due to various challenges detailed below. this area was definitely much more challenging than we initially expected. upstreaming those changes to the official linux kernel . this goal is almost met: we have posted 5 iterations of the cedrus linux kernel driver , each time using new versions of the request api patches, helping improve this api along the way. while our patches have not been merged yet, because the request api itself hasn’t been merged, they have received significant review from the v4l developers, and we believe our patches are not far from being merged. all in all, despite the numerous challenges encountered over the last few months, we are happy to see that we have been able to deliver most of the goals completely, and we are not too far off for the few goals that haven’t yet been fully met. as we will discuss below, we will continue to work in the next months on completing those unfinished steps, and on the stretch goals that received enough funding. reaching this level of support was not a straightforward journey, as our road was paved with various obstacles that are presented below. media request api in order to add support for the vpu found on allwinner platforms, some internal plumbing is necessary in the video4linux2 (v4l2) framework, the video framework in linux. while v4l2 gained support for a specific class of vpus, so-called “stateful” (where the video bitstream is passed directly to the hardware controller) thanks to the memory2memory api, this is not sufficient for our hardware. indeed, allwinner platforms come with a “stateless” vpu, where the video needs to be parsed beforehand to extract the frame data and its associated metadata, and then passed to the hardware. v4l2 lacked an api for synchronizing the frame data and associated metadata, although it had been in development for a long time and known as the request api. our work on cedrus contributed to revive the flame for this api, that saw its development accelerated over the past months thanks to the commitment of individuals such as alexandre courbot, hans verkuil and sakari ailus. we had the opportunity to report various issues and suggest fixes over its development process, which were integrated so that all the required bits for our driver are now in. the api is finally mature and appears to be quite stable, so there is no known blocker left for its integration in the kernel. cedrus v4l2 driver the first version of the cedrus driver originally developed in 2016 by florent revest as part of an internship at bootlin was based on an old version of the request api. we therefore started by porting it to the latest version of the api and kept publishing new revisions as development of the request api happened. we also received useful feedback from the community in the process. here are the different iterations of the cedrus driver that have been sent as part of this crowdfunded effort: version 1 , march 9, 2018 version 2 , april 19, 2018 version 3 , may 7, 2018 version 4 , june 18, 2018 version 5 , july 10, 2018 in addition to those patch series adding t

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https://bootlin.com/blog/allwinner-vpu-support-in-mainline-linux-status-update-week-27/
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https://bootlin.com/training/yocto/
https://bootlin.com/wp-content/uploads/2018/06/cedrus-720.webm
https://bootlin.com/fr/
https://bootlin.com/training/buildroot/
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