linux-kernel - Re: [PATCH] drm/bridge: ldb: add support for an external bridge

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Message-ID: <2756377.lGaqSPkdTl@fedora>
Date: Wed, 29 Oct 2025 14:01:24 +0100
From: Francesco Valla <francesco@...la.it>
To: Marek Vasut <marex@...x.de>, 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>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Liu Ying <victor.liu@....com>
Cc: Alexander Stein <alexander.stein@...tq-group.com>,
 Fabian Pflug <f.pflug@...gutronix.de>, dri-devel@...ts.freedesktop.org,
 imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: ldb: add support for an external bridge

Hi,

On Wednesday, 29 October 2025 at 04:41:51 Liu Ying <victor.liu@....com> wrote:
> On 10/28/2025, Francesco Valla wrote:
> > I was trying to add display support for the i.MX93 FRDM on top of the
> > patch sent some time ago by Fabian Pflug [1], using some of the work
> > already done by Alexander Stein but not yet merged [2], but then I
> > noticed that the support for LVDS-HDMI converter bridges was missing
> > from the LDB driver already present for the i.MX93.
> > 
> > Not a fail of the driver itself, obviously, but I wonder if/how the
> > existing i.MX8MP setups (e.g.: [3]), which use the same driver, work
> > correclty. Unfortunately I don't have the i.MX8MP hardware to test them.
> 
> [3] was in my previous patch series[a].  Only patch 6&7 of [a] are applied,
> so for now [3] doesn't actually work with i.MX8MP.
> 
> And, patch 3 of [a] supports the external bridge this patch tries to support.
> 
> [b] is another patch series which includes my patch.
> 
> [a] https://patchwork.freedesktop.org/series/139266/#rev7
> [b] https://patchwork.freedesktop.org/series/154381/
> 

Thank you for your answer, it's much clearer now.

I'll drop this one and wait for [b], then.


BR,
Francesco


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