linux-kernel - Re: [PATCH v2 1/2] arm64: dts: rockchip: Add the vdpu381 Video Decoders on RK3588

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Message-ID: <2793168.mvXUDI8C0e@trenzalore>
Date: Mon, 11 Aug 2025 08:40:16 -0400
From: Detlev Casanova <detlev.casanova@...labora.com>
To: Link Mauve <linkmauve@...kmauve.fr>
Cc: linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Heiko Stuebner <heiko@...ech.de>,
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>,
 Kever Yang <kever.yang@...k-chips.com>, Shawn Lin <shawn.lin@...k-chips.com>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
 Dragan Simic <dsimic@...jaro.org>, Niklas Cassel <cassel@...nel.org>,
 Damon Ding <damon.ding@...k-chips.com>,
 Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>,
 Alexey Charkov <alchark@...il.com>, Patrick Wildt <patrick@...eri.se>,
 Chukun Pan <amadeus@....edu.cn>, Diederik de Haas <didi.debian@...ow.org>,
 Chris Morgan <macromorgan@...mail.com>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 kernel@...labora.com
Subject:
 Re: [PATCH v2 1/2] arm64: dts: rockchip: Add the vdpu381 Video Decoders on
 RK3588

Hi,

On Sunday, 10 August 2025 15:22:54 EDT Link Mauve wrote:
> Hi,
> 
> On Fri, Aug 08, 2025 at 03:36:01PM -0400, Detlev Casanova wrote:
> > Add the vdpu381 Video Decoders to the rk3588-base devicetree.
> > 
> > The RK3588 based SoCs all embed 2 vdpu381 decoders.
> > This also adds the dedicated IOMMU controllers.
> 
> Back in the VEPU121 enablement series[1] it had been decided to not
> expose multiple identical cores yet, because there is no infrastructure
> yet in the kernel to schedule multiple userland processes on multiple
> cores, or (more relevant for your usecase) to even combine two cores to
> reach 8K support.

That's right, but the device tree still defines the hardware as it is. The 
driver, however, will  make sure that each instance after the first one is 
ignored (at least for now).

> > Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> > ---
> > 
> >  arch/arm64/boot/dts/rockchip/rk3588-base.dtsi | 74 +++++++++++++++++++
> >  1 file changed, 74 insertions(+)
> 
> [snip]
> 
> Thanks,
> 
> [1]
> https://lore.kernel.org/all/20240618183816.77597-1-sebastian.reichel@collab
> ora.com/

Detlev.