linux-kernel - [PATCH v2 0/3] NVIDIA Tegra210 NVJPG support

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Message-Id: <20250611-diogo-nvjpg-v2-0-01f8c76ea90f@tecnico.ulisboa.pt>
Date: Wed, 11 Jun 2025 13:18:00 +0100
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: Thierry Reding <thierry.reding@...il.com>, 
 Mikko Perttunen <mperttunen@...dia.com>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, 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>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linux-tegra@...r.kernel.org, devicetree@...r.kernel.org, 
 Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
Subject: [PATCH v2 0/3] NVIDIA Tegra210 NVJPG support

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

---
Changes in v2:
- [01/03]: Remove reset handling, set clk rate to max
- [02/03]: Explicitly mention Tegra210 in the commit subject
- [03/03]: Explicitly mention Tegra210 in the commit subject
- Link to v1: https://lore.kernel.org/r/20250606-diogo-nvjpg-v1-0-5f2c36feeb39@tecnico.ulisboa.pt

---
Diogo Ivo (3):
      drm/tegra: Add NVJPG driver
      arm64: tegra: Add Tegra210 NVJPG power-domain node
      arm64: tegra: Add NVJPG node for Tegra210 platforms

 arch/arm64/boot/dts/nvidia/tegra210.dtsi |  14 +-
 drivers/gpu/drm/tegra/Makefile           |   1 +
 drivers/gpu/drm/tegra/drm.c              |   2 +
 drivers/gpu/drm/tegra/drm.h              |   1 +
 drivers/gpu/drm/tegra/nvjpg.c            | 331 +++++++++++++++++++++++++++++++
 5 files changed, 348 insertions(+), 1 deletion(-)
---
base-commit: 736ecbbf1e57fc3bc6575c76f6a46c84760233f8
change-id: 20250605-diogo-nvjpg-e0d4c57126c5

Best regards,
-- 
Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>