linux-kernel - Re: [PATCH v4 00/15] media: mtk-vcodec: support for MT8183 decoder

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Date:   Thu, 29 Apr 2021 14:07:24 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     Alexandre Courbot <acourbot@...omium.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Yunfei Dong <yunfei.dong@...iatek.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 00/15] media: mtk-vcodec: support for MT8183 decoder

Hi,

On 27.04.21 13:15, Alexandre Courbot wrote:
> This series adds support for the stateless API into mtk-vcodec, by first
> separating the stateful ops into their own source file, and introducing
> a new set of ops suitable for stateless decoding. As such, support for
> stateful decoders should remain completely unaffected.
> 
> This series has been tested with both MT8183 and MT8173. Decoding was
> working for both chips, and in the case of MT8173 no regression has been
> noticed.

I am trying to test the decoder with this patchset using v4l2-ctl on mt8173.

I am trying to decode an h264 file into V4L2_PIX_FMT_MT21C format.
I am not able to do it. It seems that the driver expects each buffer to start
with a nal starting code, and the v4l2-ctl command just read the files into
buffers without any parsing.

Can you share the command and the files you used for testing?

Thank you,
Dafna

> 
> Patches 1-9 add MT8183 support to the decoder using the stateless API.
> MT8183 only support H.264 acceleration.
> 
> Patches 10-15 are follow-ups that further improve compliance for the
> decoder and encoder, by fixing support for commands on both. Patch 11
> also makes sure that supported H.264 profiles are exported on MT8173.
> 
> Changes since v3:
> * Stop checking that controls are set for every request.
> * Add V4L2_CID_STATELESS_H264_START_CODE control.
> * Stop mapping OUTPUT buffers and getting the NAL type from them, use the
>    nal_ref_idc field instead.
> * Make V4L2_CID_MIN_BUFFERS_FOR_CAPTURE control stateful-only.
> * Set vb2_buffer's field to V4L2_FIELD_NONE in buffer validation hook.
> 
> Changes since v2:
> * Add follow-up patches fixing support for START/STOP commands for the
>    encoder, and stateful decoder.
> 
> Alexandre Courbot (8):
>    media: mtk-vcodec: vdec: handle firmware version field
>    media: mtk-vcodec: support version 2 of decoder firmware ABI
>    media: add Mediatek's MM21 format
>    dt-bindings: media: document mediatek,mt8183-vcodec-dec
>    media: mtk-vcodec: vdec: use helpers in VIDIOC_(TRY_)DECODER_CMD
>    media: mtk-vcodec: vdec: clamp OUTPUT resolution to hardware limits
>    media: mtk-vcodec: make flush buffer reusable by encoder
>    media: mtk-vcodec: venc: support START and STOP commands
> 
> Hirokazu Honda (1):
>    media: mtk-vcodec: vdec: Support H264 profile control
> 
> Hsin-Yi Wang (1):
>    media: mtk-vcodec: venc: make sure buffer exists in list before
>      removing
> 
> Yunfei Dong (5):
>    media: mtk-vcodec: vdec: move stateful ops into their own file
>    media: mtk-vcodec: vdec: support stateless API
>    media: mtk-vcodec: vdec: support stateless H.264 decoding
>    media: mtk-vcodec: vdec: add media device if using stateless api
>    media: mtk-vcodec: enable MT8183 decoder
> 
>   .../bindings/media/mediatek-vcodec.txt        |   1 +
>   .../media/v4l/pixfmt-reserved.rst             |   7 +
>   drivers/media/platform/Kconfig                |   2 +
>   drivers/media/platform/mtk-vcodec/Makefile    |   3 +
>   .../platform/mtk-vcodec/mtk_vcodec_dec.c      | 818 +++---------------
>   .../platform/mtk-vcodec/mtk_vcodec_dec.h      |  28 +-
>   .../platform/mtk-vcodec/mtk_vcodec_dec_drv.c  |  66 +-
>   .../mtk-vcodec/mtk_vcodec_dec_stateful.c      | 667 ++++++++++++++
>   .../mtk-vcodec/mtk_vcodec_dec_stateless.c     | 370 ++++++++
>   .../platform/mtk-vcodec/mtk_vcodec_drv.h      |  58 +-
>   .../platform/mtk-vcodec/mtk_vcodec_enc.c      | 135 ++-
>   .../platform/mtk-vcodec/mtk_vcodec_enc_drv.c  |   4 +
>   .../mtk-vcodec/vdec/vdec_h264_req_if.c        | 780 +++++++++++++++++
>   .../media/platform/mtk-vcodec/vdec_drv_if.c   |   3 +
>   .../media/platform/mtk-vcodec/vdec_drv_if.h   |   1 +
>   .../media/platform/mtk-vcodec/vdec_ipi_msg.h  |  23 +-
>   .../media/platform/mtk-vcodec/vdec_vpu_if.c   |  43 +-
>   .../media/platform/mtk-vcodec/vdec_vpu_if.h   |   5 +
>   drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
>   include/uapi/linux/videodev2.h                |   1 +
>   20 files changed, 2293 insertions(+), 723 deletions(-)
>   create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateful.c
>   create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c
>   create mode 100644 drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c
> 
> --
> 2.31.1.498.g6c1eba8ee3d-goog
>