linux-kernel - Re: [PATCH v7 4/4] drm/tidss: Add OLDI bridge support

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Message-Id: <D9XFCQYPTRMX.3AKZYI2Z5SV2Y@kernel.org>
Date: Fri, 16 May 2025 09:59:30 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "Aradhya Bhatia" <aradhya.bhatia@...ux.dev>, "Rob Herring"
 <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor
 Dooley" <conor+dt@...nel.org>, "Tomi Valkeinen"
 <tomi.valkeinen@...asonboard.com>, "Jyri Sarha" <jyri.sarha@....fi>
Cc: "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>, "Thomas
 Zimmermann" <tzimmermann@...e.de>, "Maxime Ripard" <mripard@...nel.org>,
 "David Airlie" <airlied@...il.com>, "Laurent Pinchart"
 <laurent.pinchart@...asonboard.com>, "Simona Vetter" <simona@...ll.ch>,
 "Nishanth Menon" <nm@...com>, "Vignesh Raghavendra" <vigneshr@...com>,
 "Devarsh Thakkar" <devarsht@...com>, "Praneeth Bajjuri" <praneeth@...com>,
 "Udit Kumar" <u-kumar1@...com>, "Jayesh Choudhary" <j-choudhary@...com>,
 "Francesco Dolcini" <francesco@...cini.it>, "Alexander Sverdlin"
 <alexander.sverdlin@...mens.com>, "DRI Development List"
 <dri-devel@...ts.freedesktop.org>, "Devicetree List"
 <devicetree@...r.kernel.org>, "Linux Kernel List"
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 4/4] drm/tidss: Add OLDI bridge support

On Sat Mar 29, 2025 at 2:39 PM CET, Aradhya Bhatia wrote:
> From: Aradhya Bhatia <a-bhatia1@...com>
>
> The AM62x and AM62Px SoCs feature 2 OLDI TXes each, which makes it
> possible to connect them in dual-link or cloned single-link OLDI display
> modes. The current OLDI support in tidss_dispc.c can only support for
> a single OLDI TX, connected to a VP and doesn't really support
> configuration of OLDIs in the other modes. The current OLDI support in
> tidss_dispc.c also works on the principle that the OLDI output can only
> be served by one, and only one, DSS video-port. This isn't the case in
> the AM62Px SoC, where there are 2 DSS controllers present that share the
> OLDI TXes.
>
> Having their own devicetree and their own bridge entity will help
> support the various display modes and sharing possiblilities of the OLDI
> hardware.
>
> For all these reasons, add support for the OLDI TXes as DRM bridges.
>
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> Tested-by: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
> Signed-off-by: Aradhya Bhatia <aradhya.bhatia@...ux.dev>

Tested-by: Michael Walle <mwalle@...nel.org> # on a j722s/am67a

FWIW, I have a few downstream patches to get the DSS on j722s
running.

-michael

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