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

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Message-ID: <00aaa8ff-1344-48dd-b0cb-5e8f4518ff6b@notapiano>
Date: Thu, 22 Aug 2024 11:25:42 -0400
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Chen-Yu Tsai <wenst@...omium.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	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 Wed, Aug 21, 2024 at 12:28:34PM +0800, 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>

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Would be good to have Alper verify that with this change the internal display
works again in their specific setup, although this change seems reasonable to me
either way.

Thanks,
Nícolas