[fedora-arm] Re: Fedora 28 with the "grate-driver" for (older) Tegra

> In short, this FLOSS driver allows to enable video acceleration with
> vdpau on older tegra soc.

How does this relate to the tegr-vde driver for video acceleration
that's already in the upstream kernel[1] , albeit in staging, that
supports tegra20-114 now.

> There is also a very basic mesa driver, but it only advertise opengl
> 1.4 and gles 2.0 (probably not really conformant even). At least it
> doesn't crash with glxgears.
> There is support up to Tegra114, Tegra K1 may comes later using the
> same framework.

There's also a patch series to add 124 AKA TK1 support [2] and once
they add support for the v4l requests API [3] this should all work
OOTB with standard mesa AFAICT. So my question is how does grate fit
into / relate to the upstream work?

> Please reminds that for later SOC (Tegra K1+), f29 will have a better
> support. There mesa has tegra/nouveau mesa drivers that will operate.
> (not tested recently).

Well with the VDE driver and the v4l requests API the TK1 should
support accelerated video once the userspace settles down, the newer
devices (tegra210/186 etc) have completely different video decode IP
blocks.

> Mini FAQ:
> - Why not upstream ?
> There is an ABI destaging process in progress for tegra in the Linux
> kernel. Once done, it will be probably possible to have more changes
> upstream. Unfortunately, this is a long process and the review queue
> in Tegra is growing.
> - How to enable video hw acceleration ?
> Look at the grate-driver page for libvdpau-tegra for the doc
> You will need the mesa libdrm libvdpau-tegra xorg-x11-drv-opentegra
> packages from the (2) repos. These replace fedora ones. You can keep
> the fedora kernel. Please verify to have about cma=128M.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cd6c56feb591f6fe66bebcbeb43ecc0e2acdcffa
[2] https://www.spinics.net/lists/linux-tegra/msg35020.html
[3] https://www.spinics.net/lists/linux-tegra/msg35462.html
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