On Fri, Jun 26, 2020 at 04:20:08PM +0200, Nicolas Chauvet wrote:

Hi,

I'm interested in having at least initial VDE support merged upstream
for tegra124 (not yet tested).
I was wondering if merging the dts part and the needed compatible
along with few fixes (2) would be enough to work with the current
userspace ? (libvdpau-tegra)

I plan to have it tried after 5.18-rc3 land and report.

Thanks for your advice.

(1) https://github.com/thierryreding/linux/commits/for-4.22/vde
(2) currently testing patches:
ae8cd25401f9 ARM: tegra: Enable SMMU for VDE on Tegra124
53e4822d773a staging: media: tegra-vde: Keep VDE in reset when unused
eb5b12a86651 staging: media: tegra-vde: Print out invalid FD
c28810efcb90 staging: media: tegra-vde: Support BSEV clock and reset
55266929b386 staging: media: tegra-vde: Properly mark invalid entries
3aae01ea407f ARM: tegra: Add BSEV clock and reset for VDE on Tegra30
f5e6a834c766 ARM: tegra: Add BSEV clock and reset for VDE on Tegra20
615bf7bab259 ARM: tegra: Enable VDE on Tegra124

I don't think those patches are enough to make this work on Tegra124. I
think you basically need all of the patches from that branch, at least
up to the point where the V4L2 conversion starts.

Given that the V4L2 conversion has stalled, it might be worth reviving
this relatively short series once more. I can look into rebasing only
the VDE patches and see if they still work.

Thierry