linux-kernel - [PATCH RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C DisplayPort Altmode

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Message-Id: <20240229-topic-sm8x50-upstream-phy-combo-typec-mux-v1-0-07e24a231840@linaro.org>
Date: Thu, 29 Feb 2024 14:07:00 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: 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 RFT 0/7] arm64: qcom: allow up to 4 lanes for the Type-C
 DisplayPort Altmode

Register a typec mux in order to change the PHY mode on the Type-C
mux events depending on the mode and the svid when in Altmode setup.

The DisplayPort phy should be left enabled if is still powered on
by the DRM DisplayPort controller, so bail out until the DisplayPort
PHY is not powered off.

The Type-C Mode/SVID only changes on plug/unplug, and USB SAFE states
will be set in between of USB-Only, Combo and DisplayPort Only so
this will leave enough time to the DRM DisplayPort controller to
turn of the DisplayPort PHY.

The patchset also includes bindings changes and DT changes.

This has been successfully tested on an SM8550 board, but the
Thinkpad X13s deserved testing between non-PD USB, non-PD DisplayPort,
PD USB Hubs and PD Altmode Dongles to make sure the switch works
as expected.

The DisplayPort 4 lanes setup can be check with:
$ cat /sys/kernel/debug/dri/ae01000.display-controller/DP-1/dp_debug
	name = msm_dp
	drm_dp_link
		rate = 540000
		num_lanes = 4
..

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
Neil Armstrong (7):
      dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: Add mode-switch
      phy: qcom: qmp-combo: store DP phy power state
      phy: qcom: qmp-combo: introduce QPHY_MODE
      phy: qcom: qmp-combo: register a typec mux to change the QPHY_MODE
      arm64: dts: qcom-sm8550: allow 4 lanes for DisplayPort and enable QMP PHY mode-switch
      arm64: dts: qcom-sm8650: allow 4 lanes for DisplayPort and enable QMP PHY mode-switch
      arm64: dts: qcom-mode-switch: allow 4 lanes for DisplayPort and enable QMP PHY mode-switch

 .../phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml         |   5 +
 .../dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts     |   6 +-
 arch/arm64/boot/dts/qcom/sm8550-hdk.dts            |   3 +-
 arch/arm64/boot/dts/qcom/sm8550-qrd.dts            |   3 +-
 arch/arm64/boot/dts/qcom/sm8650-qrd.dts            |   3 +-
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c          | 168 +++++++++++++++++++--
 6 files changed, 173 insertions(+), 15 deletions(-)
---
base-commit: b321c0e8ca754d8cd9f23ceba958e3ea93c6519e
change-id: 20240229-topic-sm8x50-upstream-phy-combo-typec-mux-31b5252513c9

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