linux-kernel - Re: [PATCH v5 0/5] Add support for video hardware codec of STMicroelectronics STM32 SoC series

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Message-ID: <a240d2ac-db0e-481b-8d13-3ae76cfd2fe7@foss.st.com>
Date: Thu, 21 Dec 2023 14:08:23 +0100
From: Hugues FRUCHET <hugues.fruchet@...s.st.com>
To: Alex Bee <knaerzche@...il.com>,
        Nicolas Dufresne
	<nicolas.dufresne@...labora.com>
CC: Marco Felsch <m.felsch@...gutronix.de>, Adam Ford <aford173@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Andrzej Pietrasiewicz
	<andrzej.p@...labora.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Laurent Pinchart
	<laurent.pinchart+renesas@...asonboard.com>,
        Benjamin Mugnier
	<benjamin.mugnier@...s.st.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        <linux-kernel@...r.kernel.org>,
        Daniel Almeida
	<daniel.almeida@...labora.com>,
        Heiko Stuebner <heiko@...ech.de>, Hans
 Verkuil <hverkuil@...all.nl>,
        Rob Herring <robh+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <linux-media@...r.kernel.org>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Ezequiel Garcia
	<ezequiel@...guardiasur.com.ar>
Subject: Re: [PATCH v5 0/5] Add support for video hardware codec of
 STMicroelectronics STM32 SoC series

Hi Alex,

This is because VDEC and VENC are two separated IPs with their own 
hardware resources and no links between both.
On future SoCs, VDEC can ship on its own, same for VENC.

Hoping that this clarify.

Best regards,
Hugues.

On 12/21/23 13:40, Alex Bee wrote:
> Hi Hugues, Hi Nicolas,
> 
> is there any specific reason I'm not understanding / seeing why this is 
> added in two seperate vdec* / venc* files and not a single vpu* file? Is 
> it only for the seperate clocks (-names) / irqs (-names) / callbacks? 
> Those are defined per variant and perfectly fit in a single file holding 
> one vdec and one venc variant.
> 
> Alex
> 
> Am 21.12.23 um 09:47 schrieb Hugues Fruchet:
>> This patchset introduces support for VDEC video hardware decoder
>> and VENC video hardware encoder of STMicroelectronics STM32MP25
>> SoC series.
>>
>> This initial support implements H264 decoding, VP8 decoding and
>> JPEG encoding.
>>
>> This has been tested on STM32MP257F-EV1 evaluation board.
>>
>> ===========
>> = history =
>> ===========
>> version 5:
>>     - Precise that video decoding as been successfully tested up to 
>> full HD
>>     - Add Nicolas Dufresne reviewed-by
>>
>> version 4:
>>     - Fix comments from Nicolas about dropping encoder raw steps
>>
>> version 3:
>>     - Fix remarks from Krzysztof Kozlowski:
>>      - drop "items", we keep simple enum in such case
>>      - drop second example - it is the same as the first
>>     - Drop unused node labels as suggested by Conor Dooley
>>     - Revisit min/max resolutions as suggested by Nicolas Dufresne
>>
>> version 2:
>>     - Fix remarks from Krzysztof Kozlowski on v1:
>>      - single video-codec binding for both VDEC/VENC
>>      - get rid of "-names"
>>      - use of generic node name "video-codec"
>>
>> version 1:
>>    - Initial submission
>>
>> Hugues Fruchet (5):
>>    dt-bindings: media: Document STM32MP25 VDEC & VENC video codecs
>>    media: hantro: add support for STM32MP25 VDEC
>>    media: hantro: add support for STM32MP25 VENC
>>    arm64: dts: st: add video decoder support to stm32mp255
>>    arm64: dts: st: add video encoder support to stm32mp255
>>
>>   .../media/st,stm32mp25-video-codec.yaml       |  50 ++++++++
>>   arch/arm64/boot/dts/st/stm32mp251.dtsi        |  12 ++
>>   arch/arm64/boot/dts/st/stm32mp255.dtsi        |  17 +++
>>   drivers/media/platform/verisilicon/Kconfig    |  14 ++-
>>   drivers/media/platform/verisilicon/Makefile   |   4 +
>>   .../media/platform/verisilicon/hantro_drv.c   |   4 +
>>   .../media/platform/verisilicon/hantro_hw.h    |   2 +
>>   .../platform/verisilicon/stm32mp25_vdec_hw.c  |  92 ++++++++++++++
>>   .../platform/verisilicon/stm32mp25_venc_hw.c  | 115 ++++++++++++++++++
>>   9 files changed, 307 insertions(+), 3 deletions(-)
>>   create mode 100644 
>> Documentation/devicetree/bindings/media/st,stm32mp25-video-codec.yaml
>>   create mode 100644 
>> drivers/media/platform/verisilicon/stm32mp25_vdec_hw.c
>>   create mode 100644 
>> drivers/media/platform/verisilicon/stm32mp25_venc_hw.c
>>
>