linux-kernel - Re: [PATCH v4 04/15] drm/atomic: Introduce helper to lookup connector by encoder

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Message-ID: <qskzti5jawqioug2jw46zylnax4uxoczvqolwqgbseflqaddze@3uke3rkwbpzs>
Date: Wed, 26 Feb 2025 08:38:39 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Douglas Anderson <dianders@...omium.org>, 
	Herve Codina <herve.codina@...tlin.com>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	Simona Vetter <simona.vetter@...ll.ch>
Subject: Re: [PATCH v4 04/15] drm/atomic: Introduce helper to lookup
 connector by encoder

On Tue, Feb 25, 2025 at 05:43:52PM +0100, Maxime Ripard wrote:
> With the bridges switching over to drm_bridge_connector, the direct
> association between a bridge driver and its connector was lost.
> 
> This is mitigated for atomic bridge drivers by the fact you can access
> the encoder, and then call drm_atomic_get_old_connector_for_encoder() or
> drm_atomic_get_new_connector_for_encoder() with drm_atomic_state.
> 
> This was also made easier by providing drm_atomic_state directly to all
> atomic hooks bridges can implement.
> 
> However, bridge drivers don't have a way to access drm_atomic_state
> outside of the modeset path, like from the hotplug interrupt path or any
> interrupt handler.
> 
> Let's introduce a function to retrieve the connector currently assigned
> to an encoder, without using drm_atomic_state, to make these drivers'
> life easier.
> 
> Co-developed-by: Simona Vetter <simona.vetter@...ll.ch>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
>  drivers/gpu/drm/drm_atomic.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_atomic.h     |  3 +++
>  2 files changed, 48 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry