linux-kernel - [PATCH v2 0/3] media: rockchip: rkvdec: add support for the VDPU346 variant

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Message-Id: <20251226113140.573759-1-christianshewitt@gmail.com>
Date: Fri, 26 Dec 2025 11:31:37 +0000
From: Christian Hewitt <christianshewitt@...il.com>
To: Detlev Casanova <detlev.casanova@...labora.com>,
	Olivier Crête <olivier.crete@...labora.com>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Diederik de Haas <diederik@...ow-tech.com>,
	Dmitry Osipenko <dmitry.osipenko@...labora.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dragan Simic <dsimic@...jaro.org>,
	Chukun Pan <amadeus@....edu.cn>,
	linux-media@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] media: rockchip: rkvdec: add support for the VDPU346 variant

This series depends upon Detlev Casanova's current v7 series for VDPU381 and
VDPU383 support [0]. It adds support for the VDPU346 IP block used for H264,
HEVC and (in active work) VP9 on the RK356X boards. VDPU346 appears to be a
close relation to VDPU381 used with RK3588, except with a single core, output
limited to 4K, and minor feature differences, e.g. HEVC level 5.1 on VDPU346
vs 6.1 on VDPU381. To handle differences we declare a new compatible.

The device-tree changes are derived from prior-art in Detlev's patches for
RK3576 and RK3588, the vendor kernel [1], and some earlier patch attempts
from Piotr Oniszczuk and Diederik de Haas.

The register differences between VDPU346 and VDPU381 appear to be minimal so
we currently and intentionally reuse the VDPU381 h264, hevc, and regs files
to avoid duplicating code. There is some evidence of buffer size changes in
testing which still need to be explored. If further register analysis needs
separate files for VDPU346 the refactoring will be beyond my current n00b
coding skills and I will either need some coaching or would be happy to pass
the series over to a more experienced developer.

NB: Testing with the v1 series showed lower mbps bitrate performance. This
appears to be resolved though it's unclear to me whether this results from
kernel changes or the ongoing reworking of ffmpeg v4l2_request support [2].
However with my current Linux 6.19-rc2 test branch [3] I'm now able to play
Jellyfish H264 and HEVC test media over 100mbps.

Changes since v1:
- Drop DO-NOT-MERGE patch as changes included in Detvlev v7 series
- Adapt to variant/capability changes in Detlev's v7 series
- Add bindings ack from Rob
- Add rkvdec ack from Nicolas
- Rebase against Linux 6.19-rc2

[0] https://patchwork.kernel.org/project/linux-rockchip/list/?series=1034794
[1] https://github.com/rockchip-linux/kernel/blob/develop-6.6/arch/arm64/boot/dts/rockchip/rk356x.dtsi#L1539
[2] https://code.ffmpeg.org/Kwiboo/FFmpeg/commits/branch/v4l2request-v3
[3] https://github.com/chewitt/linux/commits/rockchip-6.19.y

Christian Hewitt (3):
  media: dt-bindings: rockchip: Add RK3568 Video Decoder bindings
  media: rkvdec: Add support for the VDPU346 variant
  arm64: dts: rockchip: Add the vdpu346 Video Decoders on RK356X

 .../bindings/media/rockchip,vdec.yaml         |   2 +
 arch/arm64/boot/dts/rockchip/rk356x-base.dtsi |  49 +++++++++
 .../media/platform/rockchip/rkvdec/rkvdec.c   | 103 ++++++++++++++++++
 3 files changed, 154 insertions(+)

-- 
2.34.1