On Wed, Jun 11, 2025 at 01:04:14PM +0100, Diogo Ivo wrote: > > > On 6/10/25 10:05 AM, Thierry Reding wrote: > > On Fri, Jun 06, 2025 at 11:45:33AM +0100, Diogo Ivo wrote: > > > Hello, > > > > > > This series adds support for the NVJPG hardware accelerator found in the > > > Tegra210 SoC. > > > > > > The kernel driver is essentially a copy of the NVDEC driver as both > > > engines are Falcon-based. > > > > > > For the userspace part I have written a Mesa Gallium backend [1] that, > > > while still very much experimental, works in decoding images with VA-API. > > > > > > I have been using ffmpeg to call VA-API with the following command: > > > > > > ffmpeg -v verbose -hwaccel vaapi -hwaccel_device /dev/dri/renderD129 -i > > > <input.jpg> -pix_fmt bgra -f fbdev /dev/fb0 > > > > > > which decodes <input.jpg> and shows the result in the framebuffer. > > > > > > The firmware for the engine can be obtained from a Linux for Tegra > > > distribution. > > > > By the way, have you tried running this on anything newer than Tegra210? > > Given your progress on this, we can probably start thinking about > > submitting the binaries to linux-firmware. > > Since I don't have access to other Tegra platforms I haven't been able > to test this driver there. For this I need help from someone with access > to more hardware, I can send a version that just adds the extra compatibles > and we could see if it works. > > As for the firmwares that would be great!
I think both of these are things that Mikko and I can help with. > > > Due to the way the Gallium implementation works for Tegra > > > the GPU also needs to be enabled. > > > > I wonder if maybe we can get rid of this requirement. While it's > > certainly nice to have the GPU enabled, there may be cases where using > > only the other engines may be advantageous. Originally when I had worked > > on VIC, I was looking at how it could be used for compositing without > > getting the GPU involved. That's something that Android devices tend(ed) > > to do because of the power savings that come with it. > > Yes I think this is possible to do, it mainly has involves properly > handling the Gallium driver initialization. I'll take a look at it > before submitting the MR for the Gallium driver. Okay, great. But I think it's definitely something that we can defer if it's non-trivial. Thierry
signature.asc
Description: PGP signature
