linux-kernel - [PATCH v2 0/5] arm64: qcom: x1e78100-lenovo-thinkpad-t14s: add support for HDMI output

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Message-Id: <20250902-topic-x1e80100-hdmi-v2-0-f4ccf0ef79ab@linaro.org>
Date: Tue, 02 Sep 2025 11:00:27 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-phy@...ts.infradead.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v2 0/5] 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:
- 2 DP + 2 USB3
- 4 DP
- 2 USB3

Add the needed property to specify the lanes mapping and
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.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.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 (5):
      dt-bindings: display: bridge: simple: document the Realtek RTD2171 DP-to-HDMI bridge
      drm/bridge: simple: add Realtek RTD2171 DP-to-HDMI bridge
      dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy: Document static lanes mapping
      phy: qcom: qmp-combo: get the static lanes mapping from DT
      arm64: dts: qcom: x1e78100-lenovo-thinkpad-t14s: add HDMI nodes

 .../bindings/display/bridge/simple-bridge.yaml     |   1 +
 .../phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml         |  29 +++++
 .../dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi    |  70 ++++++++++++
 drivers/gpu/drm/bridge/simple-bridge.c             |   5 +
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c          | 118 +++++++++++++++++++--
 5 files changed, 214 insertions(+), 9 deletions(-)
---
base-commit: 7fa4d8dc380fbd81a9d702a855c50690c9c6442c
change-id: 20250821-topic-x1e80100-hdmi-3bd5b5bd2d96

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