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
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/
- [2] https://lore.kernel.org/all/20250807-topic-4ln_dp_respin-v4-0-43272d6eca92@oss.qualcomm.com/
- [3] https://lore.kernel.org/all/20250822-topic-x1e80100-4lanes-v3-0-5363acad9e32@linaro.org/
Signed-off-by: Neil Armstrong <neil.armstrong@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 (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 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
.../bindings/display/bridge/simple-bridge.yaml | 1 +
.../phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml | 59 ++++++++-
.../dts/qcom/x1e78100-lenovo-thinkpad-t14s.dtsi | 82 +++++++++++++
drivers/gpu/drm/bridge/simple-bridge.c | 5 +
drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 132 +++++++++++++++++++--
5 files changed, 270 insertions(+), 9 deletions(-)
---
base-commit: 947efd54a86984b5f7dee9cf18c1ee82ec0361a2
change-id: 20250821-topic-x1e80100-hdmi-3bd5b5bd2d96
Best regards,
--
Neil Armstrong <neil.armstrong@linaro.org>