From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 244DB1509AE; Mon, 9 Sep 2024 08:15:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725869737; cv=none; b=ucI1eeYrCkLNanWZKly9chkJTxbvQnAuIId/rA0jzMegqIDfvuC8F08CaJ15Sypo78+fYuXvxzabvXfDUv+voFY+SvVQ6v+jSnCpK0sgNkn3Jr0wNQoXyCWQ7DJ6nNhkLYf8kL1+vTAyzYRW+s6tjWTn2+BqBRhbUCbCC6oFd3c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725869737; c=relaxed/simple; bh=mLxIOmnUfTWHKDy0RraF2PSz1kY2vALX8CG3SWnHtaA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=aTDXD+v2/j8esAEFkN+qKhwqDUsBv8L5lxqzU7x4B8zhWNiiTlchH3uzvzZDnCZpezS6dX+Z4lPZRq27h/RagasYNb+IEmXfHlLvm8PTlFUEiTVdIBzwOWe7KWbU8BsFVlM9EvzWAAVPLC4Si00Mci1PTAypkxs/W9hvHqKD2kA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=vdHgOCHh; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="vdHgOCHh" Received: from [192.168.88.20] (91-156-87-48.elisa-laajakaista.fi [91.156.87.48]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id BA3DD3EA; Mon, 9 Sep 2024 10:14:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1725869657; bh=mLxIOmnUfTWHKDy0RraF2PSz1kY2vALX8CG3SWnHtaA=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=vdHgOCHhan2TIGa+DjdOzgyplnNWIObqllHvJPXLvVFM0A81u4GcLZhu51Bt8b8xd VVy/FZG3FJ3KBzosP/EkfOw97y/H3IdNqZbDZH5inpO4DG4ShXWkNgfYTmxSEGC7bQ NGi1WfM0nfhruANQelXOkrncv0QRmT3H7WJJimPs= Message-ID: Date: Mon, 9 Sep 2024 11:15:28 +0300 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/4] drm/tidss: Add OLDI bridge support To: Francesco Dolcini , Aradhya Bhatia , max.krummenacher@toradex.com Cc: 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 References: <20240716084248.1393666-1-a-bhatia1@ti.com> <20240906114311.GA32916@francesco-nb> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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? Tomi