linux-kernel - Re: [PATCH] arm64: dts: mediatek: mt8186-corsola: Disable DPI display interface

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Message-ID: <bb0dba5a-68e9-4c03-bbea-6788f4cc7d16@gmail.com>
Date: Mon, 2 Sep 2024 18:03:28 +0200
From: Matthias Brugger <matthias.bgg@...il.com>
To: Chen-Yu Tsai <wenst@...omium.org>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 Stephen Boyd <swboyd@...omium.org>, Pin-yen Lin <treapking@...omium.org>,
 Alper Nebi Yasak <alpernebiyasak@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: mediatek: mt8186-corsola: Disable DPI display
 interface



On 21/08/2024 06:28, Chen-Yu Tsai wrote:
> The DPI display interface feeds the external display pipeline. However
> the pipeline representation is currently incomplete. Efforts are still
> under way to come up with a way to represent the "creative" repurposing
> of the DP bridge chip's internal output mux, which is meant to support
> USB type-C orientation changes, to output to one of two type-C ports.
> 
> Until that is finalized, the external display can't be fully described,
> and thus won't work. Even worse, the half complete graph potentially
> confuses the OS, breaking the internal display as well.
> 
> Disable the external display interface across the whole Corsola family
> until the DP / USB Type-C muxing graph binding is ready.
> 
> Reported-by: Alper Nebi Yasak <alpernebiyasak@...il.com>
> Closes: https://lore.kernel.org/linux-mediatek/38a703a9-6efb-456a-a248-1dd3687e526d@gmail.com/
> Fixes: 8855d01fb81f ("arm64: dts: mediatek: Add MT8186 Krabby platform based Tentacruel / Tentacool")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>

Applied, thanks

> ---
> Stephen has recently posted the "platform/chrome: Add DT USB/DP
> muxing/topology support" patch series, which is now up to v3 [1].
> More work based on this series is needed for the DP bridge drivers.
> 
> [1] https://lore.kernel.org/dri-devel/20240819223834.2049862-1-swboyd@chromium.org/
> ---
>   arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
> index 0c4a26117428..682c6ad2574d 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola.dtsi
> @@ -353,7 +353,8 @@ &dpi {
>   	pinctrl-names = "default", "sleep";
>   	pinctrl-0 = <&dpi_pins_default>;
>   	pinctrl-1 = <&dpi_pins_sleep>;
> -	status = "okay";
> +	/* TODO Re-enable after DP to Type-C port muxing can be described */
> +	status = "disabled";
>   };
>   
>   &dpi_out {