linux-kernel - Re: [PATCH v3 0/3] NVIDIA Tegra210 NVJPG support

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Message-ID: <yvzfp5igm2trom4kil337wfsyum75amvgmxkadi537dohmnbqy@wgbm3zxojldc>
Date: Fri, 4 Jul 2025 11:04:09 +0200
From: Thierry Reding <thierry.reding@...il.com>
To: David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>, 
	Mikko Perttunen <mperttunen@...dia.com>, Jonathan Hunter <jonathanh@...dia.com>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 0/3] NVIDIA Tegra210 NVJPG support

On Mon, Jun 30, 2025 at 09:48:41AM +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. Due to the way the Gallium implementation works for Tegra
> the GPU also needs to be enabled.
> 
> Thanks!
> 
> Diogo
> 
> To: Thierry Reding <thierry.reding@...il.com>
> To: Mikko Perttunen <mperttunen@...dia.com>
> To: David Airlie <airlied@...il.com>
> To: Simona Vetter <simona@...ll.ch>
> To: Jonathan Hunter <jonathanh@...dia.com>
> To: Philipp Zabel <p.zabel@...gutronix.de>
> To: Rob Herring <robh@...nel.org>
> To: Krzysztof Kozlowski <krzk+dt@...nel.org>
> To: Conor Dooley <conor+dt@...nel.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-tegra@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
> 
> [1]: https://gitlab.freedesktop.org/d.ivo/mesa/-/tree/diogo/vaapi_gl?ref_type=heads

Dave, Simona,

This doesn't add new userspace ABI and instead reuses the same ABI that
we use for VIC and NVDEC, but it does technically add a new driver for
one of the multimedia engines.

Given that we have Diogo's VA-API work on gitlab, I think all of the
criteria are met to exercise this.

If you don't have any objections, I'd like to apply this for the
upcoming release.

Thanks,
Thierry

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