linux-kernel - Re: [PATCH v9 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge

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Message-ID: <CAG3jFyv1kvr1rGok5WB4HL5yRH0f26ZrrmQzSv6uC9kQqSxF3Q@mail.gmail.com>
Date:   Fri, 26 Mar 2021 15:42:26 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Adrien Grassein <adrien.grassein@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge

Pushed: https://cgit.freedesktop.org/drm/drm-misc/commit/?id=3aa6031deefa9a2c056af2182af02d3dc5df1067

On Fri, 26 Mar 2021 at 13:20, Adrien Grassein <adrien.grassein@...il.com> wrote:
>
> Hi,
> this patch set adds the support of the Lontium lt8912 MIPI to HDMI
> bridge in the kernel.
>
> It's only support the video part, not the audio part yet
> since I don't have the datasheet of this component.
> I get the current i2c configuration from Digi and
> Boundary drivers.
> Developed using the DB_DSIHD board from BoundaryDevices.
>
> Update in v2
>   - Use standard data-lanes instead of a custom prop;
>   - Use hdmi-connector node.
>
> Update in v3
>   - Fix indentation;
>   - Implement missing bridge functions;
>   - Add some comments.
>
> Update in v4
>   - Fix bridge ops;
>   - Fix i2c error detection.
>
> Update in v5
>   - Fix lt8912 name (lt8912b instead of lt8912);
>   - Implement HPD via a workaround. In fact I don't have the datasheet
>     of this component yet so I can't say if the configuration of the
> registers is correct or if I have an HW issue on my board. So, I choose
> to implement a fake version of HPD using a workqueue and polling the
> status regularly.
>
> Update in v6
>   - Fix a warning found by "kernel test robot"
>
> Update in v7
>   - Fix HPD logic (via an HW emulation);
>   - HPD from chip is still not working.
>
> Update in v8
>   - Remove HPD logic (will be added later when HW bug qill be fixed).
>
> Update in v9
>   - Fix errors found in scripts/checkpatch.pl --strict
>
> Thanks,
>
> Adrien Grassein (2):
>   dt-bindings: display: bridge: Add documentation for LT8912B
>   drm/bridge: Introduce LT8912B DSI to HDMI bridge
>
>  .../display/bridge/lontium,lt8912b.yaml       | 102 +++
>  MAINTAINERS                                   |   6 +
>  drivers/gpu/drm/bridge/Kconfig                |  14 +
>  drivers/gpu/drm/bridge/Makefile               |   1 +
>  drivers/gpu/drm/bridge/lontium-lt8912b.c      | 765 ++++++++++++++++++
>  5 files changed, 888 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
>  create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c
>
> --
> 2.25.1
>