linux-kernel - Re: [PATCH v2 9/9] arm64: dts: rockchip: Add the Video-Demo overlay for Lion Haikou

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Message-ID: <66560f3d-dbb3-4c4e-a46b-8e2f604d53ed@cherry.de>
Date: Wed, 3 Dec 2025 11:36:10 +0100
From: Quentin Schulz <quentin.schulz@...rry.de>
To: Heiko Stuebner <heiko@...ech.de>
Cc: maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
 tzimmermann@...e.de, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, andy.yan@...k-chips.com,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, cn.liweihao@...il.com,
 Heiko Stuebner <heiko.stuebner@...rry.de>
Subject: Re: [PATCH v2 9/9] arm64: dts: rockchip: Add the Video-Demo overlay
 for Lion Haikou

Hi Heiko,

On 12/2/25 2:37 PM, Quentin Schulz wrote:
> Hi Heiko,
> 
> On 10/21/25 9:42 AM, Heiko Stuebner wrote:
>> From: Heiko Stuebner <heiko.stuebner@...rry.de>

[...]

> I have not yet managed to make the DSI display work. It is detected but 
> modetest test pattern doesn't show, only blank.
> 

Seems like it was a classical case of PEBKAC. Haven't figured out what I 
did wrong the whole of yesterday, but it works fine today.

> Since there's only one VOP, I'm also wondering if we need to disable 
> HDMI here? Or is Linux capable of handling multiple connected displays 
> but only use one? I've tried to make DSI work with the HDMI controller 
> disabled, it didn't change anything.
> 

I can display the modetest pattern on either DSI or HDMI, when HDMI is 
used to display the pattern, DSI is not showing anything (it shows the 
console by default for me).

So no need to disable HDMI in the overlay with the DSI display.

Tested-by: Quentin Schulz <quentin.schulz@...rry.de>

Thanks!
Quentin