linux-kernel - Re: [PATCH v2 0/7] media: rkvdec: Add HEVC backend

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Message-Id: <DC0FTXJNW0KB.3I8DLNHJVL21O@cknow.org>
Date: Tue, 12 Aug 2025 14:11:53 +0200
From: "Diederik de Haas" <didi.debian@...ow.org>
To: "Jonas Karlman" <jonas@...boo.se>, "Ezequiel Garcia"
 <ezequiel@...guardiasur.com.ar>, "Detlev Casanova"
 <detlev.casanova@...labora.com>, "Mauro Carvalho Chehab"
 <mchehab@...nel.org>
Cc: "Alex Bee" <knaerzche@...il.com>, "Nicolas Dufresne"
 <nicolas.dufresne@...labora.com>, "Sebastian Fricke"
 <sebastian.fricke@...labora.com>, <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: Re: [PATCH v2 0/7] media: rkvdec: Add HEVC backend

Hi Jonas,

On Sun Aug 10, 2025 at 11:24 PM CEST, Jonas Karlman wrote:
> This series add a HEVC backend to the Rockchip Video Decoder driver.
>
> With the dependent H.264 High 10 and 4:2:2 profile support series
> finally merged there is finally time to send a v2 with minor changes and
> a suggested code style fix of this series. v1 of this series has been
> fully functional up until recent unstaging of the rkvdec driver.
>
> A version of this HEVC backend has been in use by the LibreELEC distro
> for the past 5+ years [1]. It was initially created based on a copy of
> the H264 backend, unstable HEVC uAPI controls and a cabac table + scaling
> matrix functions shamelessly copied 1:1 from the Rockchip mpp library.
>
> It has since then been extended to use the stable HEVC uAPI controls and
> improved opon e.g. to include support for rk3288 and fix decoding issues
> by Alex Bee and Nicolas Dufresne.
>
> The version submitted in this series is based on the code currently used
> by the LibreELEC distro, excluding hard/soft reset, and with cabac table
> and scaling matrix functions picked from Sebastian Fricke prior series
> to add a HEVC backend [2].
>
> Big thanks to Alex Bee, Nicolas Dufresne and Sebastian Fricke for making
> this series possible!
>
> Patch 1 add the new HEVC backend.
> Patch 2-3 add variants support to the driver.
> Patch 4 add support for a rk3288 variant.
> Patch 5 add a rk3328 variant to work around hw quirks.
> Patch 6-7 add device tree node for rk3288.

It looks like I had a previous version of linuxtv-rkvdec-hevc-v2 branch
locally and that also had this commit:
- media: rkvdec: Keep decoder clocks gated

Is that one no longer needed/useful/etc ?

And 'chewitt' also had a commit to fix 8/10-bit selection:
https://github.com/chewitt/linux/commit/4b93b05d2ca608bc23f1d52bcc32df926d435c7c
"WIP: media: rkvdec: fix 8-bit/10-bit format selection"

I haven't tried that one (yet), but did  try an other variant with
changing the ordering in rkvdec_hevc_decoded_fmts but that didn't work
in my tests. (Can ofc be PEBKAC)

Would that be useful? I do/did have consistent problems with playing
10-bit encoded video files.

> This was tested on a ROCK Pi 4 (RK3399) and Rock64 (RK3328):
> <snip>
>
> Please note that there is a known issue with concurrent decoding,
> decoding errors in one decode session may affect a separate session.
> The only known mitigation to this is to pause decoding for some time
> and/or do a full HW reset, something to handle in future series.

Or would that be (potential) material for a future series as well?

Cheers,
  Diederik
>
> <snip>
>
> Alex Bee (4):
>   media: rkvdec: Add variants support
>   media: rkvdec: Add RK3288 variant
>   media: rkvdec: Disable QoS for HEVC and VP9 on RK3328
>   ARM: dts: rockchip: Add vdec node for RK3288
>
> Jonas Karlman (3):
>   media: rkvdec: Add HEVC backend
>   media: rkvdec: Implement capability filtering
>   media: dt-bindings: rockchip,vdec: Add RK3288 compatible
>
>  .../bindings/media/rockchip,vdec.yaml         |    1 +
>  arch/arm/boot/dts/rockchip/rk3288.dtsi        |   17 +-
>  .../media/platform/rockchip/rkvdec/Makefile   |    2 +-
>  .../rockchip/rkvdec/rkvdec-hevc-data.c        | 1848 +++++++++++++++++
>  .../platform/rockchip/rkvdec/rkvdec-hevc.c    |  826 ++++++++
>  .../platform/rockchip/rkvdec/rkvdec-regs.h    |    4 +
>  .../platform/rockchip/rkvdec/rkvdec-vp9.c     |   10 +
>  .../media/platform/rockchip/rkvdec/rkvdec.c   |  184 +-
>  .../media/platform/rockchip/rkvdec/rkvdec.h   |   15 +
>  9 files changed, 2886 insertions(+), 21 deletions(-)
>  create mode 100644 drivers/media/platform/rockchip/rkvdec/rkvdec-hevc-data.c
>  create mode 100644 drivers/media/platform/rockchip/rkvdec/rkvdec-hevc.c


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