linux-kernel - Re: [PATCH v3 0/4] Add V4L stateless video decoder API support to NVIDIA Tegra driver

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Date:   Fri, 18 Feb 2022 16:04:28 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/4] Add V4L stateless video decoder API support to
 NVIDIA Tegra driver

Dmitry,

On 07/02/2022 15:19, Dmitry Osipenko wrote:
> Support V4L stateless video decoder API by NVIDIA Tegra decoder driver.
> Tested using GStreamer [1] and libvdpau-tegra [2][8].
> 
> [1] https://github.com/grate-driver/gstreamer/commit/b8509bdbb69b534e61419ea1798f32f9ad2f3597
> [2] https://github.com/grate-driver/libvdpau-tegra/commit/f822e95911e5e0c39f8ba19f843ddc1e0138d5ce
> [8] https://github.com/grate-driver/libvdpau-tegra/commit/80db4d02369f2a984ce3173d6bc305f32e9fdb97

Nice work!

Can you make a v4 that just moves the whole driver to drivers/media/platform? I see no
reason for keeping this in staging.

Once I have a v4 that does that I plan to make a PR for it.

For the v4 don't forget to update MAINTAINERS with the new path and to drop the TODO
file in staging.

Regards,

	Hans

> 
> Changelog:
> 
> v3: - Added new decode_params flags [7] instead of V4L2_BUF_FLAG_*FRAME flags,
>       as was suggested by Nicolas Dufresne.
> 
>       [7] https://github.com/grate-driver/gstreamer/commit/c5cd847f9c26b7669720ae58f9058de2515f51a2
> 
>     - Added new patch that removes legacy UAPI.
> 
> v2: - Made V4L2_BUF_FLAG_*FRAME flags mandatory [3] and dropped reading
>       of raw bitstream from the driver code, as was suggested by
>       Nicolas Dufresne.
> 
>       [3] https://github.com/grate-driver/gstreamer/commit/aee292f0f2e84b7654a314dd7e63f916888ffaa5
> 
>     - Ran v4l2-compliance [4] and fluster [5][6] tests, like was suggested by
>       Nicolas Dufresne. Fixed minor v4l2-compliance errors that were related
>       to a partial initialization of the coded format and were harmless in
>       practice, but made compliance checker unhappy.
> 
>       [4] https://gist.github.com/digetx/5d6bcdab633488f1dcc7c141ab90d30e
>       [5] https://gist.github.com/digetx/b06c5d779e9d25afa41d9f46946fe399
>       [6] https://gist.github.com/digetx/ac4198bc340e5065aa8ec3288bb21356
> 
> Dmitry Osipenko (4):
>   media: v4l2-ctrls: Add new V4L2_H264_DECODE_PARAM_FLAG_P/BFRAME flags
>   media: staging: tegra-vde: Factor out H.264 code
>   media: staging: tegra-vde: Support V4L stateless video decoder API
>   media: staging: tegra-vde: Remove legacy UAPI support
> 
>  .../media/v4l/ext-ctrls-codec-stateless.rst   |    6 +
>  drivers/staging/media/tegra-vde/Kconfig       |    7 +
>  drivers/staging/media/tegra-vde/Makefile      |    2 +-
>  .../staging/media/tegra-vde/dmabuf-cache.c    |    2 +-
>  drivers/staging/media/tegra-vde/h264.c        |  946 +++++++++++++++
>  drivers/staging/media/tegra-vde/iommu.c       |    2 +-
>  drivers/staging/media/tegra-vde/uapi.h        |   73 --
>  drivers/staging/media/tegra-vde/v4l2.c        | 1018 +++++++++++++++++
>  drivers/staging/media/tegra-vde/vde.c         |  945 ++-------------
>  drivers/staging/media/tegra-vde/vde.h         |  121 +-
>  include/uapi/linux/v4l2-controls.h            |    2 +
>  11 files changed, 2170 insertions(+), 954 deletions(-)
>  create mode 100644 drivers/staging/media/tegra-vde/h264.c
>  delete mode 100644 drivers/staging/media/tegra-vde/uapi.h
>  create mode 100644 drivers/staging/media/tegra-vde/v4l2.c
>