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

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Message-ID: <6164422a-6265-4726-8da5-68bb8eafb9e6@bootlin.com>
Date: Thu, 11 Sep 2025 10:51:06 +0200
From: Miguel Gazquez <miguel.gazquez@...tlin.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: 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>,
 Maxime Ripard <mripard@...nel.org>, 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



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.

> 
>>
>> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
>> Signed-off-by: Miguel Gazquez <miguel.gazquez@...tlin.com>
>> ---
>>   drivers/gpu/drm/bridge/ite-it66121.c | 121 ++++++++++++++++++++++++++++++++---
>>   1 file changed, 112 insertions(+), 9 deletions(-)
> 

-- 
Miguel Gazquez, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com