Re: [PATCH 04/26] drm/bridge: make of_drm_find_bridge() a wrapper of drm_of_find_bridge()

From: "Luca Ceresoli" <luca.ceresoli@bootlin.com>
To: "Maxime Ripard" <mripard@kernel.org>
Cc: "Andrzej Hajda" <andrzej.hajda@intel.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Robert Foss" <rfoss@kernel.org>,
	"Laurent Pinchart" <Laurent.pinchart@ideasonboard.com>,
	"Jonas Karlman" <jonas@kwiboo.se>,
	"Jernej Skrabec" <jernej.skrabec@gmail.com>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"David Airlie" <airlied@gmail.com>,
	"Simona Vetter" <simona@ffwll.ch>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Alexey Brodkin" <abrodkin@synopsys.com>,
	"Phong LE" <ple@baylibre.com>, "Liu Ying" <victor.liu@nxp.com>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"Adrien Grassein" <adrien.grassein@gmail.com>,
	"Laurent Pinchart" <laurent.pinchart+renesas@ideasonboard.com>,
	"Tomi Valkeinen" <tomi.valkeinen+renesas@ideasonboard.com>,
	"Kieran Bingham" <kieran.bingham+renesas@ideasonboard.com>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Magnus Damm" <magnus.damm@gmail.com>,
	"Kevin Hilman" <khilman@baylibre.com>,
	"Jerome Brunet" <jbrunet@baylibre.com>,
	"Martin Blumenstingl" <martin.blumenstingl@googlemail.com>,
	"Chun-Kuang Hu" <chunkuang.hu@kernel.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	"Matthias Brugger" <matthias.bgg@gmail.com>,
	"AngeloGioacchino Del Regno"
	<angelogioacchino.delregno@collabora.com>,
	"Anitha Chrisanthus" <anitha.chrisanthus@intel.com>,
	"Edmund Dea" <edmund.j.dea@intel.com>,
	"Inki Dae" <inki.dae@samsung.com>,
	"Seung-Woo Kim" <sw0312.kim@samsung.com>,
	"Kyungmin Park" <kyungmin.park@samsung.com>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Alim Akhtar" <alim.akhtar@samsung.com>,
	"Hui Pu" <Hui.Pu@gehealthcare.com>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	<dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
	<linux-doc@vger.kernel.org>, <imx@lists.linux.dev>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-renesas-soc@vger.kernel.org>,
	<linux-amlogic@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<linux-samsung-soc@vger.kernel.org>,
	"Anusha Srivatsa" <asrivats@redhat.com>
Subject: Re: [PATCH 04/26] drm/bridge: make of_drm_find_bridge() a wrapper of drm_of_find_bridge()
Date: Thu, 11 Dec 2025 18:48:22 +0100	[thread overview]
Message-ID: <DEVKRHI0WLHG.1J4ULCK2DYF2Q@bootlin.com> (raw)
In-Reply-To: <20251201-fragrant-kingfisher-of-expertise-e43bff@houat>

Hi Maxime,

On Mon Dec 1, 2025 at 5:34 PM CET, Maxime Ripard wrote:
...
>> The main user to be converted is drm_of_find_panel_or_bridge(), which is
>> very tricky, and in turn it is used by devm_drm_of_get_bridge(). We
>> discussed this in the past and the conclusion was a rework of the drm_panel
>> lifetime was needed to be able to properly replace
>> drm_of_find_panel_or_bridge().
>
> Yeah. I wonder, now that we have a proper allocation scheme for panels
> too, if we shouldn't just create a panel_bridge for every panel we
> allocate.

I would definitely second this idea.

>> Maxime, Anusha, are you aware of any steps forward about dynamic panel
>> lifetime, after devm_drm_panel_alloc()?
>
> AFAIK, Anusha stopped working on it. I'm fairly busy at the moment, but
> early next year I'll try to revive that effort.

That would be great! Please Cc me so I can review and test your work.

Luca

--
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com