linux-kernel - Re: [PATCH v2 2/3] drm: panel: Add LG SW49410 Panel

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Message-ID: <3b80a14a-07dd-4df3-8b74-6f4a046669c6@ixit.cz>
Date: Tue, 16 Dec 2025 13:57:53 +0100
From: David Heidelberg <david@...t.cz>
To: Paul Sajna <sajattack@...tmarketos.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Jessica Zhang <jesszhan0024@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Thierry Reding
 <thierry.reding@...il.com>, Sam Ravnborg <sam@...nborg.org>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, phone-devel@...r.kernel.org,
 Amir Dahan <system64fumo@...tonmail.com>
Subject: Re: [PATCH v2 2/3] drm: panel: Add LG SW49410 Panel

On 16/09/2025 04:32, Paul Sajna wrote:
> From: Amir Dahan <system64fumo@...tonmail.com>
> 
> Added panel driver used by LG G7 ThinQ (judyln)
> 
> Signed-off-by: Amir Dahan <system64fumo@...tonmail.com>
> Co-developed-by: Paul Sajna <sajattack@...tmarketos.org>
> Signed-off-by: Paul Sajna <sajattack@...tmarketos.org>
> ---
>   drivers/gpu/drm/panel/Kconfig            |  13 +
>   drivers/gpu/drm/panel/Makefile           |   1 +
>   drivers/gpu/drm/panel/panel-lg-sw49410.c | 502 +++++++++++++++++++++++++++++++
>   3 files changed, 516 insertions(+)
> 

Hello Paul,

I've looked into the driver and device-tree for judyln, I think there is 
at least missing support for two labibb supplies. This DDIC driver thus 
should have at least 2 regulators (maybe three?).

This implies:
  - driver needs to enable regulators to work properly (if you don't 
workaround it with `regulator-always-on`, which isn't right)
  - this driver is unlikely handled by simple panel

David