[PATCH v4 0/9] Add support for RK3588 DisplayPort Controller

[Andy Yan]

From: Andy Yan <andy.yan@xxxxxxxxxxxxxx>


There are two DW DPTX based DisplayPort Controller on rk3588 which
are compliant with the DisplayPort Specification Version 1.4 with
the following features:

* DisplayPort 1.4a
* Main Link: 1/2/4 lanes
* Main Link Support 1.62Gbps, 2.7Gbps, 5.4Gbps and 8.1Gbps
* AUX channel 1Mbps
* Single Stream Transport(SST)
* Multistream Transport (MST)
* Type-C support (alternate mode)
* HDCP 2.2, HDCP 1.3
* Supports up to 8/10 bits per color component
* Supports RBG, YCbCr4:4:4, YCbCr4:2:2, YCbCr4:2:0
* Pixel clock up to 594MHz
* I2S, SPDIF audio interface

The current version of this patch series only supports basic display outputs.
I conducted tests with DP0 in 1080p and 4K@60 YCbCr4:2:0 modes; the ALT/Type-C
mode was tested on Rock 5B, DP1 was tested on Rock 5 ITX by Stephen and Piotr.

HDCP and audio features remain unimplemented.

For RK3588, it's only support SST, while in the upcoming RK3576, it can support
MST output.


Changes in v4:
- Drop unnecessary header files
- Switch to devm_drm_bridge_alloc
- Drop unused function
- Add platform_set_drvdata
- Link to v3: https://lore.kernel.org/linux-rockchip/20250403033748.245007-1-andyshrk@xxxxxxx/

Changes in v3:
- Rebase on drm-misc-next
- Switch to common helpers to power up/down dp link
- Only pass parameters to phy that should be set
- First introduced in this version.
- First introduced in this version.
- Add RA620 into bridge chain.
- Link to v2: https://lore.kernel.org/linux-rockchip/20250312104214.525242-1-andyshrk@xxxxxxx/

Changes in v2:
- Fix a character encoding issue
- Fix compile error when build as module
- Add phy init
- Only use one dw_dp_link_train_set
- inline dw_dp_phy_update_vs_emph
- Use dp_sdp
- Check return value of drm_modeset_lock
- Merge code in atomic_pre_enable/mode_fixup to atomic_check
- Return NULL if can't find a supported output format
- Fix max_link_rate from plat_data
- no include uapi path
- switch to drmm_encoder_init
- Sort in alphabetical order
- Link to V1: https://lore.kernel.org/linux-rockchip/20250223113036.74252-1-andyshrk@xxxxxxx/

Andy Yan (9):
  dt-bindings: display: rockchip: Add schema for RK3588 DPTX Controller
  drm/bridge: synopsys: Add DW DPTX Controller support library
  drm/rockchip: Add RK3588 DPTX output support
  dt-bindings: display: simple-bridge: Add ra620 compatible
  drm/birdge: simple-bridge: Add support for radxa ra620
  arm64: dts: rockchip: Add DP0 for rk3588
  arm64: dts: rockchip: Add DP1 for rk3588
  arm64: dts: rockchip: Enable DisplayPort for rk3588s Cool Pi 4B
  arm64: dts: rockchip: Enable DP2HDMI for ROCK 5 ITX

 .../display/bridge/simple-bridge.yaml         |    1 +
 .../display/rockchip/rockchip,dw-dp.yaml      |  150 ++
 arch/arm64/boot/dts/rockchip/rk3588-base.dtsi |   30 +
 .../arm64/boot/dts/rockchip/rk3588-extra.dtsi |   30 +
 .../boot/dts/rockchip/rk3588-rock-5-itx.dts   |   59 +
 .../boot/dts/rockchip/rk3588s-coolpi-4b.dts   |   37 +
 drivers/gpu/drm/bridge/simple-bridge.c        |    5 +
 drivers/gpu/drm/bridge/synopsys/Kconfig       |    7 +
 drivers/gpu/drm/bridge/synopsys/Makefile      |    1 +
 drivers/gpu/drm/bridge/synopsys/dw-dp.c       | 2052 +++++++++++++++++
 drivers/gpu/drm/rockchip/Kconfig              |    9 +
 drivers/gpu/drm/rockchip/Makefile             |    1 +
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c     |  150 ++
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c   |    1 +
 drivers/gpu/drm/rockchip/rockchip_drm_drv.h   |    1 +
 include/drm/bridge/dw_dp.h                    |   20 +
 16 files changed, 2554 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/rockchip/rockchip,dw-dp.yaml
 create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-dp.c
 create mode 100644 drivers/gpu/drm/rockchip/dw_dp-rockchip.c
 create mode 100644 include/drm/bridge/dw_dp.h

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2.43.0