linux-kernel - Re: [PATCH REGRESSION v3] drm/panel: simple: restore connector

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Message-Id: <176829564393.3883041.15471923198292664331.b4-ty@linaro.org>
Date: Tue, 13 Jan 2026 10:14:03 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: 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>, 
 Anusha Srivatsa <asrivats@...hat.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Jessica Zhang <jessica.zhang@....qualcomm.com>, 
 Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 stable@...r.kernel.org
Subject: Re: [PATCH REGRESSION v3] drm/panel: simple: restore
 connector_type fallback

Hi,

On Thu, 18 Dec 2025 14:34:43 +0100, Ludovic Desroches wrote:
> The switch from devm_kzalloc() + drm_panel_init() to
> devm_drm_panel_alloc() introduced a regression.
> 
> Several panel descriptors do not set connector_type. For those panels,
> panel_simple_probe() used to compute a connector type (currently DPI as a
> fallback) and pass that value to drm_panel_init(). After the conversion
> to devm_drm_panel_alloc(), the call unconditionally used
> desc->connector_type instead, ignoring the computed fallback and
> potentially passing DRM_MODE_CONNECTOR_Unknown, which
> drm_panel_bridge_add() does not allow.
> 
> [...]

Thanks, Applied to https://gitlab.freedesktop.org/drm/misc/kernel.git (drm-misc-fixes)

[1/1] drm/panel: simple: restore connector_type fallback
      https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/9380dc33cd6ae4a6857818fcefce31cf716f3fae

-- 
Neil