Re: [PATCH v5 0/8] Add Type-C DP support for RK3399 EVB IND board

Rob Herring (Arm)
2025-10-13T12:15:53Z

On Sat, 11 Oct 2025 11:32:25 +0800, Chaoyi Chen wrote:
> From: Chaoyi Chen <chaoyi.chen@rock-chips.com>
>
> This series focuses on adding Type-C DP support for USBDP PHY and DP
> driver. The USBDP PHY and DP will perceive the changes in cable status
> based on the USB PD and Type-C state machines provided by TCPM. Before
> this, the USBDP PHY and DP controller of RK3399 sensed cable state
> changes through extcon, and devices such as the RK3399 Gru-Chromebook
> rely on them. This series should not break them.
>
> ====
> 1. DisplayPort HPD status notify
>
> Before v4, I implemented a variety of DP HPD status notify. However,
> they all had various problems and it was difficult to become a common
> solution.
>
> Under Dmitry's guidance, I try to add default DRM AUX HPD device when
> register DisplayPort altmode in patch 1. That makes it redundant for
> each Type-C chip driver to implement a similar registration process
> in embedded scenarios.
>
> ====
> 2. Altmode switching and orientation switching for USBDP PHY
>
> For USB Type-C interfaces, an external Type-C controller chip assists
> by detecting cable attachment, determining plug orientation, and
> reporting USB PD message. The USB/DP combo PHY supports software
> configurable pin mapping and DisplayPort lane assignment. Based on
> these message, the combo PHY can perform both altmode switching and
> orientation switching via software.
>
> The RK3399 EVB IND board has a Type-C interface DisplayPort. It use
> fusb302 chip as Type-C controller. The connection diagram is shown below:
>
> fusb302 chip +---> USB2.0 PHY ----> DWC3 USB controller
> |
> +---> USB/DP PHY0 +--> CDN-DP controller
> |
> +--> DWC3 USB controller
>
> ====
> 3. Multiple bridge model for RK3399 CDN-DP
>
> The RK3399 has two USB/DP combo PHY and one CDN-DP controller. And
> the CDN-DP can be switched to output to one of the PHYs.
>
> USB/DP PHY0 ---+
> | <----> CDN-DP controller
> USB/DP PHY1 ---+
>
> In previous versions, if both PHY ports were connected to DP,
> the CDN-DP driver would select the first PHY port for output.
>
> On Dmitry's suggestion, we introduced a multi-bridge model to support
> flexible selection of the output PHY port. For each PHY port, a
> separate encoder and bridge are registered.
>
> The change is based on the DRM AUX HPD bridge, rather than the
> extcon approach. This requires the DT to correctly describe the
> connections between the first bridge in bridge chain and DP
> controller. And Once the first bridge is obtained, we can get the
> last bridge corresponding to the USB-C connector, and then set the
> DRM connector's fwnode to the corresponding one to enable HPD
> notification.
>
> ====
> Patch1 add default HPD device when register Displayport altmode.
> Patch2 add new Type-C mode switch for RK3399 USBDP phy binding.
> Patch3 add typec_mux and typec_switch for RK3399 USBDP PHY.
> Patch4 add DRM AUX bridge support for RK3399 USBDP PHY.
> Patch5 drops CDN-DP's extcon dependency when Type-C is present.
> Patch6 add multiple bridges to support PHY port selection.
> Patch7 add missing dp_out port for RK3399 CDN-DP.
> Patch8 add Type-C DP support for RK3399 EVB IND board.
>
> Changes in v5:
> - Link to V4: https://lore.kernel.org/all/20250922012039.323-1-kernel@airkyi.com/
> - Remove the calls related to `drm_aux_hpd_bridge_notify()`.
> - Place the helper functions in the same compilation unit.
> - Add more comments about parent device.
> - Add DRM AUX bridge support for RK3399 USBDP PHY
> - By parsing the HPD bridge chain, set the connector's of_node to the
> of_node corresponding to the USB-C connector.
> - Return EDID cache when other port is already enabled.
>
> Changes in v4:
> - Link to V3: https://lore.kernel.org/all/20250729090032.97-1-kernel@airkyi.com/
> - Add default HPD device for DisplayPort altmode.
> - Introduce multiple bridges for CDN-DP.
> - ...
>
> Changes in v3:
> - Link to V2: https://lore.kernel.org/all/20250718062619.99-1-kernel@airkyi.com/
> - Add more descriptions to clarify the role of the PHY in switching.
> - Fix wrong vdo value.
> - Fix port node in usb-c-connector.
>
> Changes in v2:
> - Link to V1: https://lore.kernel.org/all/20250715112456.101-1-kernel@airkyi.com/
> - Reuse dp-port/usb3-port in rk3399-typec-phy binding.
> - Fix compile error when CONFIG_TYPEC is not enabled.
> - Notify DP HPD state by USB/DP PHY.
> - Ignore duplicate HPD events.
> - Add endpoint to link DP PHY and DP controller.
> - Fix devicetree coding style.
>
> Chaoyi Chen (8):
> usb: typec: Add default HPD device when register DisplayPort altmode
> dt-bindings: phy: rockchip: rk3399-typec-phy: Support mode-switch
> phy: rockchip: phy-rockchip-typec: Add typec_mux/typec_switch support
> phy: rockchip: phy-rockchip-typec: Add DRM AUX bridge
> drm/rockchip: cdn-dp: Support handle lane info without extcon
> drm/rockchip: cdn-dp: Add multiple bridges to support PHY port
> selection
> arm64: dts: rockchip: Add missing dp_out port for RK3399 CDN-DP
> arm64: dts: rockchip: rk3399-evb-ind: Add support for DisplayPort
>
> .../phy/rockchip,rk3399-typec-phy.yaml | 6 +
> arch/arm64/boot/dts/rockchip/rk3399-base.dtsi | 10 +-
> .../boot/dts/rockchip/rk3399-evb-ind.dts | 146 ++++++
> drivers/gpu/drm/rockchip/Kconfig | 2 +
> drivers/gpu/drm/rockchip/cdn-dp-core.c | 380 +++++++++++++---
> drivers/gpu/drm/rockchip/cdn-dp-core.h | 24 +-
> drivers/phy/rockchip/phy-rockchip-typec.c | 417 +++++++++++++++++-
> drivers/usb/typec/class.c | 26 ++
> include/linux/usb/typec_altmode.h | 2 +
> 9 files changed, 931 insertions(+), 82 deletions(-)
>
> --
> 2.49.0
>
>
>

My bot found new DTB warnings on the .dts files added or changed in this
series.

Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings
are fixed by another series. Ultimately, it is up to the platform
maintainer whether these warnings are acceptable or not. No need to reply
unless the platform maintainer has comments.

If you already ran DT checks and didn't see these error(s), then
make sure dt-schema is up to date:

pip3 install dtschema --upgrade

This patch series was applied (using b4) to base:
Base: attempting to guess base-commit...
Base: tags/next-20251010 (best guess, 8/9 blobs matched)
Base: tags/next-20251010 (use --merge-base to override)

If this is not the correct base, please add 'base-commit' tag
(or use b4 which does this automatically)

New warnings running 'make CHECK_DTBS=y for arch/arm64/boot/dts/rockchip/' for 20251011033233.97-1-kernel@airkyi.com:

arch/arm64/boot/dts/rockchip/rk3399-evb-ind.dtb: syscon@ff770000 (rockchip,rk3399-grf): usb2phy@e450: 'port' does not match any of the regexes: '^pinctrl-[0-9]+$'
from schema $id: http://devicetree.org/schemas/soc/rockchip/grf.yaml#
arch/arm64/boot/dts/rockchip/rk3399-evb-ind.dtb: syscon@ff770000 (rockchip,rk3399-grf): usb2phy@e450: Unevaluated properties are not allowed ('port' was unexpected)
from schema $id: http://devicetree.org/schemas/soc/rockchip/grf.yaml#
arch/arm64/boot/dts/rockchip/rk3399-evb-ind.dtb: usb2phy@e450 (rockchip,rk3399-usb2phy): 'port' does not match any of the regexes: '^pinctrl-[0-9]+$'
from schema $id: http://devicetree.org/schemas/phy/rockchip,inno-usb2phy.yaml#
arch/arm64/boot/dts/rockchip/rk3399-evb-ind.dtb: /sound: failed to match any schema with compatible: ['rockchip,rk3399-gru-sound']