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[31.10.206.125]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c3ebd4693fsm2812530a12.37.2024.09.09.02.43.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 02:43:02 -0700 (PDT) Date: Mon, 9 Sep 2024 11:43:00 +0200 From: Max Krummenacher To: Tomi Valkeinen Cc: Francesco Dolcini , Aradhya Bhatia , max.krummenacher@toradex.com, Jyri Sarha , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Laurent Pinchart , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , DRI Development List , Devicetree List , Linux Kernel List , Nishanth Menon , Vignesh Raghavendra , Praneeth Bajjuri , Udit Kumar , Alexander Sverdlin , Randolph Sapp , Devarsh Thakkar , Jayesh Choudhary , Jai Luthra Subject: Re: [PATCH v3 0/4] drm/tidss: Add OLDI bridge support Message-ID: References: <20240716084248.1393666-1-a-bhatia1@ti.com> <20240906114311.GA32916@francesco-nb> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Sep 09, 2024 at 11:15:28AM +0300, Tomi Valkeinen wrote: > Hi, > > On 06/09/2024 14:43, Francesco Dolcini wrote: > > +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. > > What if you set "fw_devlink=off" kernel boot parameter? Hi Tomi My overlay specifing a single link which did not work by default results in a working panel with "fw_devlink=off" on the cmdline. Max > > Tomi >