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

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Message-Id: <20240809-fp5-dp-sound-v1-0-d7ba2c24f6b9@fairphone.com>
Date: Fri, 09 Aug 2024 10:33:56 +0200
From: Luca Weiss <luca.weiss@...rphone.com>
To: 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, Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 0/3] Add DisplayPort sound support for Fairphone 5
 smartphone

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.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
Luca Weiss (3):
      ASoC: dt-bindings: qcom,sm8250: Add generic QCM6490 sound card
      ASoC: qcom: sc8280xp: Add support for generic QCM6490
      arm64: dts: qcom: qcm6490-fairphone-fp5: Add DisplayPort sound support

 .../devicetree/bindings/sound/qcom,sm8250.yaml     |  1 +
 arch/arm64/boot/dts/qcom/qcm6490-fairphone-fp5.dts | 37 ++++++++++++++++++++++
 sound/soc/qcom/sc8280xp.c                          |  1 +
 3 files changed, 39 insertions(+)
---
base-commit: 6cdb38a56eaf615abc60fbeec0e4ccbdf93468e3
change-id: 20240809-fp5-dp-sound-b3768f3019bd

Best regards,
-- 
Luca Weiss <luca.weiss@...rphone.com>