linux-kernel - Re: [PATCH v5 00/20] Add Tegra20 parallel video input capture

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Message-ID: <20230412111610.2fbfdf7b@booty>
Date:   Wed, 12 Apr 2023 11:16:10 +0200
From:   Luca Ceresoli <luca.ceresoli@...tlin.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     linux-tegra@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Richard Leitner <richard.leitner@...data.com>
Subject: Re: [PATCH v5 00/20] Add Tegra20 parallel video input capture

Hello Hans,

On Fri,  7 Apr 2023 15:38:32 +0200
Luca Ceresoli <luca.ceresoli@...tlin.com> wrote:

> New in v5: dropped the patch that was removing lots of the logic behind
> enum_format, after discussion with Hans. The rest is unmodified except for
> rebasing and fixing a couple typos in comments.
> 
> Full details follow.
> 
> Tegra20 and other Tegra SoCs have a video input (VI) peripheral that can
> receive from either MIPI CSI-2 or parallel video (called respectively "CSI"
> and "VIP" in the documentation). The kernel currently has a staging driver
> for Tegra210 CSI capture. This patch set adds support for Tegra20 VIP
> capture.
> 
> Unfortunately I had no real documentation available to base this work on.
> I only had a working downstream 3.1 kernel, so I started with the driver
> found there and heavily reworked it to fit into the mainline tegra-video
> driver structure. The existing code appears written with the intent of
> being modular and allow adding new input mechanisms and new SoCs while
> keeping a unique VI core module. However its modularity and extensibility
> was not enough to add Tegra20 VIP support, so I added some hooks to turn
> hard-coded behaviour into per-SoC or per-bus customizable code. There are
> also a fix, some generic cleanups and DT bindings.
> 
> Quick tour of the patches:
> 
>  * Device tree bindings
> 
>    01. dt-bindings: display: tegra: add Tegra20 VIP
>    02. dt-bindings: display: tegra: vi: add 'vip' property and example
> 
>  * Minor improvements to logging, comments, cleanups
> 
>    03. staging: media: tegra-video: improve documentation of tegra_video_format fields
>    04. staging: media: tegra-video: document tegra_channel_get_remote_source_subdev
>    05. staging: media: tegra-video: fix typos in comment
>    06. staging: media: tegra-video: improve error messages
>    07. staging: media: tegra-video: slightly simplify cleanup on errors
>    08. staging: media: tegra-video: move private struct declaration to C file
>    09. staging: media: tegra-video: move tegra210_csi_soc to C file
>    10. staging: media: tegra-video: remove unneeded include
> 
>  * Preparation to make the VI module generic enough to host Tegra20 and VIP
> 
>    11. staging: media: tegra-video: Kconfig: allow TPG only on Tegra210
>    12. staging: media: tegra-video: move tegra_channel_fmt_align to a per-soc op
>    13. staging: media: tegra-video: move default format to soc-specific data
>    14. staging: media: tegra-video: move MIPI calibration calls from VI to CSI
>    15. staging: media: tegra-video: add a per-soc enable/disable op
>    16. staging: media: tegra-video: move syncpt init/free to a per-soc op
>    17. staging: media: tegra-video: add syncpts for Tegra20 to struct tegra_vi
>    18. staging: media: tegra-video: add hooks for planar YUV and H/V flip
>    19. staging: media: tegra-video: add H/V flip controls
> 
>  * Implementation of VIP and Tegra20
> 
>    20. staging: media: tegra-video: add support for Tegra20 parallel input
> 
> Enjoy!
> 
> Changed in v5:
> - removed patch 3 as requested by Hans Verkuil; now the driver is kept
>   video-node-centric and the enum_format logic is unchanged
> - rebased on top of that
> - trivial fixes (typos)

According to your review of v4, removing patch 3 was the only change
required, and I didn't do anything else, and there have been no big
changes since v1 anyway, so I was wondering whether this series has any
hope to make it for 6.4...

Best regards,
Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com