linux-kernel - Re: [PATCH 0/3] Add DisplayPort sound support for Fairphone 5 smartphone

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Message-ID: <192e3c22-fd63-4891-86b2-89a3383ab76d@kernel.org>
Date: Sat, 10 Aug 2024 14:35:00 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.com>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Banajit Goswami <bgoswami@...cinc.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 alsa-devel@...a-project.org, linux-arm-msm@...r.kernel.org,
 linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Add DisplayPort sound support for Fairphone 5
 smartphone

On 9.08.2024 10:33 AM, Luca Weiss wrote:
> Add the necessary sound card bits and some dts additions to enable sound
> over DisplayPort-over-USB-C, e.g. to a connected TV or monitor.
> 
> The UCM files can be found here:
> https://gitlab.com/postmarketOS/pmaports/-/tree/master/device/testing/device-fairphone-fp5/ucm
> 
> Two extra notes:
> 
> 1. I don't quite understand whether the sound driver should have
>    SoC-specific compatible or device-specific compatible. Some earlier
>    patches by another author for a QCM6490 board and a QCS6490 board use
>    device-specific compatible - but from what I can tell this is not how
>    it's generally done for other sound drivers?
> 
> 2. Unfortunately DisplayPort enablement itself for Fairphone 5 is not
>    upstream yet. This is blocked by DSI display bringup upstream which
>    is blocked by DSC 1:1:1 not being supported upstream yet and just
>    working with a hacky patch. Nevertheless, DisplayPort audio was
>    validated working with no additional sound-related changes so once
>    DisplayPort gets enabled, sound should also just work upstream.

You can enable DP and keep DSI disabled for the time being

Konrad