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

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Message-ID: <2741308.mvXUDI8C0e@g550jk>
Date: Sat, 10 Aug 2024 15:30:01 +0200
From: Luca Weiss <luca@...aweiss.eu>
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>, ~postmarketos/upstreaming@...ts.sr.ht
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, Konrad Dybcio <konradybcio@...nel.org>
Subject:
 Re: [PATCH 0/3] Add DisplayPort sound support for Fairphone 5 smartphone

On Samstag, 10. August 2024 14:35:00 MESZ Konrad Dybcio wrote:
> 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

I need to enable dispcc for DP which breaks simple-fb from my testing?

Maybe I can figure out the correct clocks and power domains to put into the 
simple-fb node? Do you think that would work and be sufficient to make both 
simple-fb and DP work?

> 
> Konrad
>