linux-kernel - Re: [PATCH v3 0/4] drm/tidss: Add OLDI bridge support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240906114311.GA32916@francesco-nb>
Date: Fri, 6 Sep 2024 13:43:11 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Aradhya Bhatia <a-bhatia1@...com>, max.krummenacher@...adex.com
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Jyri Sarha <jyri.sarha@....fi>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	DRI Development List <dri-devel@...ts.freedesktop.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
	Praneeth Bajjuri <praneeth@...com>, Udit Kumar <u-kumar1@...com>,
	Francesco Dolcini <francesco@...cini.it>,
	Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Randolph Sapp <rs@...com>, Devarsh Thakkar <devarsht@...com>,
	Jayesh Choudhary <j-choudhary@...com>, Jai Luthra <j-luthra@...com>
Subject: Re: [PATCH v3 0/4] drm/tidss: Add OLDI bridge support

+Max

Hello Aradhya,

On Tue, Jul 16, 2024 at 02:12:44PM +0530, Aradhya Bhatia wrote:
> The addition of the 2nd OLDI TX (and a 2nd DSS in AM62Px) creates a need
> for some major changes for a full feature experience.
> 
> 1. The OF graph needs to be updated to accurately show the data flow.
> 2. The tidss and OLDI drivers now need to support the dual-link and the
>    cloned single-link OLDI video signals.
> 3. The drivers also need to support the case where 2 OLDI TXes are
>    connected to 2 different VPs - thereby creating 2 independent streams
>    of single-link OLDI outputs.

Have you considered/tested the use case in which only single link is used?
You do not mention it here and to me this is a relevant use case.

There is a workaround for this (use option 2, cloned, even if nothing is
connected to the second link), but this seems not correct.

We (Max in Cc here) noticed that this specific use case is broken on
your downstream v6.6 TI branch.

Francesco