linux-kernel - [PATCH v4 0/3] arm64: qcom: x1e78100-lenovo-thinkpad-t14s: add support for HDMI output

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Message-Id: <20250930-topic-x1e80100-hdmi-v4-0-86a14e8a34ac@linaro.org>
Date: Tue, 30 Sep 2025 09:39:46 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: Xilin Wu <sophon@...xa.com>, linux-arm-msm@...r.kernel.org, 
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v4 0/3] arm64: qcom: x1e78100-lenovo-thinkpad-t14s: add
 support for HDMI output

The Thinkpad T14s embeds a transparent 4lanes DP->HDMI transceiver
connected to the third QMP Combo PHY 4 lanes.

The QMP USB3/DP Combo PHY hosts an USB3 phy and a DP PHY on top
of a combo glue to route either lanes to the 4 shared physical lanes.

The routing of the lanes can be:
- 1/2 DP + 2 USB3
- 1/2/4 DP
- 2 USB3

We need be able to specify the lanes mapping to DisplayPort
and/or USB3 peripherals when not connected to a Type-C complex.

Add the documentation for data-lanes in the out endpoints amd
use those in the driver to setup the right PHY mode and
orientation.

Finally Add all the data routing in DT, disable mode switching and specify
the QMP Combo PHY should be in DP-Only mode to route the 4 lanes to
the underlying DP phy.

Depends on:
- [1] https://lore.kernel.org/all/20250902-topic-sm8x50-fix-qmp-usb43dp-usb-switch-v1-1-5b4a51c8c5a8@linaro.org/

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
Changes in v4:
- Add definition for single lane DP
- Fix lanes mapping for DP in bindings and driver
- Add documentation on how to interpret the data-lanes numbers
- Rewrite driver support for be simpler and split into helpers
- Rebase DT on next and drop phy.h include, and use proper mapping
- Link to v3: https://lore.kernel.org/r/20250908-topic-x1e80100-hdmi-v3-0-c53b0f2bc2fb@linaro.org

Changes in v3:
- Move the static lanes mapping in data-lanes in the out endpoints
	- new bindings
	- new drivewr implementation
	- new DT layout
- rebased on next, fixed simple bridge rebase
- added link frequencies for dp2
- Link to v2: https://lore.kernel.org/r/20250902-topic-x1e80100-hdmi-v2-0-f4ccf0ef79ab@linaro.org

Changes in v2:
- Model the HDMI transceiver as a simple bridge
- Switch to a static lanes mapping property
- Link to v1: https://lore.kernel.org/r/20250821-topic-x1e80100-hdmi-v1-0-f14ad9430e88@linaro.org

---
Neil Armstrong (3):
      dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy: Document lanes mapping when not using in USB-C complex
      phy: qcom: qmp-combo: get the USB3 & DisplayPort lanes mapping from DT
      arm64: dts: qcom: x1e78100-lenovo-thinkpad-t14s: add HDMI nodes

 .../phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml         |  67 +++++++++-
 .../dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi    |  81 ++++++++++++
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c          | 145 +++++++++++++++++++--
 3 files changed, 284 insertions(+), 9 deletions(-)
---
base-commit: 4513b3b1a91546d0dd02c5c0eb507933b328021c
change-id: 20250821-topic-x1e80100-hdmi-3bd5b5bd2d96

Best regards,
-- 
Neil Armstrong <neil.armstrong@...aro.org>