linux-kernel - Re: [PATCH] drm/bridge: ite-it66121: Add drm

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Message-ID: <20250911-innocent-daffodil-macaque-797f13@houat>
Date: Thu, 11 Sep 2025 11:50:29 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Miguel Gazquez <miguel.gazquez@...tlin.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
	Phong LE <ple@...libre.com>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	thomas.petazzoni@...tlin.com, miquel.raynal@...tlin.com, kory.maincent@...tlin.com, 
	romain.gantois@...tlin.com, praneeth@...com, Aradhya Bhatia <a-bhatia1@...com>
Subject: Re: [PATCH] drm/bridge: ite-it66121: Add drm_connector support

On Thu, Sep 11, 2025 at 10:51:06AM +0200, Miguel Gazquez wrote:
> 
> 
> Le 10/09/2025 à 04:28, Dmitry Baryshkov a écrit :
> > On Tue, Sep 09, 2025 at 06:16:43PM +0200, Miguel Gazquez wrote:
> > > From: Aradhya Bhatia <a-bhatia1@...com>
> > > 
> > > Add support for DRM connector and make the driver support the older
> > > format of attaching connectors onto the encoder->bridge->connector
> > > chain.
> > > This makes the driver compatible with display controller that only
> > > supports the old format.
> > > 
> > > [Miguel Gazquez: Rebased + made driver work with or without
> > > DRM_BRIDGE_ATTACH_NO_CONNECTOR]
> > 
> > What is the use case for not using DRM_BRIDGE_ATTACH_NO_CONNECTOR?
> 
> Some display controller drivers (like the tilcdc) call drm_bridge_attach
> without DRM_BRIDGE_ATTACH_NO_CONNECTOR, so the bridge must support both with
> and without DRM_BRIDGE_ATTACH_NO_CONNECTOR to be compatible with all display
> controllers.

I'd rather convert tilcdc to use DRM_BRIDGE_ATTACH_NO_CONNECTOR then.

Maxime

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