linux-kernel - Re: [PATCH v2] arm64: dts: mt8183: jacuzzi: Fix bus properties in anx's DSI endpoint

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Date:   Thu, 24 Feb 2022 11:51:48 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     Robert Foss <robert.foss@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Xin Ji <xji@...logixsemi.com>, kernel@...labora.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Subject: Re: [PATCH v2] arm64: dts: mt8183: jacuzzi: Fix bus properties in
 anx's DSI endpoint

Hi,

(CC-ed DRM bridge maintainers and the dri-devel ML)

On Wed, Feb 2, 2022 at 1:47 AM Nícolas F. R. A. Prado
<nfraprado@...labora.com> wrote:
>
> mt8183-kukui-jacuzzi has an anx7625 bridge connected to the output of
> its DSI host. However, after commit fd0310b6fe7d ("drm/bridge: anx7625:
> add MIPI DPI input feature"), a bus-type property started being required
> in the endpoint node by the driver to indicate whether it is DSI or DPI.
>
> Add the missing bus-type property and set it to 5
> (V4L2_FWNODE_BUS_TYPE_PARALLEL) so that the driver has its input
> configured to DSI and the display pipeline can probe correctly.

Don't people find it odd that this is setting the bus-type to "parallel"
(5) for the device to use DSI? Instead of "MIPI CSI-2 D-PHY" (4) or even
"MIPI CSI-2 C-PHY" (1) which is specified in the binding? It's completely
backwards.

Would it be possible to fix the binding and driver at this point?

Thanks
ChenYu

> While at it, also set the data-lanes property that was also introduced
> in that same commit, so that we don't rely on the default value.
>
> Fixes: fd0310b6fe7d ("drm/bridge: anx7625: add MIPI DPI input feature")
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
>
> ---
> v1: https://lore.kernel.org/all/20220120224204.773117-1-nfraprado@collabora.com
>
> Changes in v2:
> - (thanks Rob) Use proper format when refering to commit in commit
>   message as pointed out by checkpatch
>
>  arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi.dtsi
> index 8f7bf33f607d..e8f133dc96b9 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi.dtsi
> @@ -171,6 +171,8 @@ port@0 {
>
>                         anx7625_in: endpoint {
>                                 remote-endpoint = <&dsi_out>;
> +                               bus-type = <5>;
> +                               data-lanes = <0 1 2 3>;
>                         };
>                 };
>
> --
> 2.35.1
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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