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 <[email protected]> --- 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/[email protected] --- 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 <[email protected]>
