[PATCH v3 0/9] Verisilicon DC8200 driver (and adaption to TH1520)

Icenowy Zheng
2025-11-24T10:53:30Z

This patchset tries to add a driver for Verisilicon DC8200 driver, and
demonstrates the driver on T-Head TH1520 with its HDMI output.

This display controller IP is used on StarFive JH7110 too, but as the
HDMI controller used there isn't as common as the DesignWare one, I
choose to use TH1520 in this patchset.

The DC driver is written with other DC-series (mainly DC8000, which is
known to be used on Eswin EIC7700 SoC) display controllers in mind, and
uses the identification registers available on all Vivante branded IPs.
A known exception is DCNano display controller, which is unlikely to be
supported by this driver because of totally different register map and
no known identification registers. (P.S. the in-tree loongson DRM driver
seems to be for some DCNano instances based on the register map.)

The HDMI controller seems to come with some common PHY by Synopsys, the
DesignWare HDMI TX 2.0 PHY. By searching a few register names from the
BSP driver of that PHY, that PHY seems to be used by a in-tree dw-hdmi
glue, rcar_dw_hdmi -- an updated downstream version of rcar_dw_hdmi
contains all 6 registers set here in the th1520-dw-hdmi driver. Some
more suprising thing is that RK3288 uses the same PHY too, but the
in-tree dw_hdmi-rockchip driver writes the configuration data array in a
weird way to reuse the HDMI 3D TX PHY configuring function. It might be
valuable to add common configuring function and configuration data
definition for this HDMI 2.0 PHY too, but the current driver in this
patchset simply duplicated most configuration logic from rcar_dw_hdmi
driver (but with 3 extra configuration registers configured).

Revision v3 bump is part of my work for ISCAS, so the patches changed
are added with SoB from my ISCAS mailbox, and a patch modifying mailmap
is added.

Because of gaining knowledge about a chip reusing the whole DC RTL of
another chip (thus the same identification registers) without
re-generating, I decided to add SoC-specific compatible string in v3.

Icenowy Zheng (9):
dt-bindings: vendor-prefixes: add verisilicon
dt-bindings: display: add verisilicon,dc
drm: verisilicon: add a driver for Verisilicon display controllers
dt-bindings: display/bridge: add binding for TH1520 HDMI controller
drm/bridge: add a driver for T-Head TH1520 HDMI controller
riscv: dts: thead: add DPU and HDMI device tree nodes
riscv: dts: thead: lichee-pi-4a: enable HDMI
MAINTAINERS: assign myself as maintainer for verisilicon DC driver
mailmap: map all Icenowy Zheng's mail addresses

.mailmap | 4 +
.../display/bridge/thead,th1520-dw-hdmi.yaml | 120 +++++++
.../bindings/display/verisilicon,dc.yaml | 146 ++++++++
.../devicetree/bindings/vendor-prefixes.yaml | 2 +
MAINTAINERS | 8 +
.../boot/dts/thead/th1520-lichee-pi-4a.dts | 25 ++
arch/riscv/boot/dts/thead/th1520.dtsi | 70 ++++
drivers/gpu/drm/Kconfig | 2 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/bridge/Kconfig | 10 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/th1520-dw-hdmi.c | 173 +++++++++
drivers/gpu/drm/verisilicon/Kconfig | 15 +
drivers/gpu/drm/verisilicon/Makefile | 5 +
drivers/gpu/drm/verisilicon/vs_bridge.c | 330 ++++++++++++++++++
drivers/gpu/drm/verisilicon/vs_bridge.h | 40 +++
drivers/gpu/drm/verisilicon/vs_bridge_regs.h | 54 +++
drivers/gpu/drm/verisilicon/vs_crtc.c | 217 ++++++++++++
drivers/gpu/drm/verisilicon/vs_crtc.h | 29 ++
drivers/gpu/drm/verisilicon/vs_crtc_regs.h | 60 ++++
drivers/gpu/drm/verisilicon/vs_dc.c | 205 +++++++++++
drivers/gpu/drm/verisilicon/vs_dc.h | 39 +++
drivers/gpu/drm/verisilicon/vs_dc_top_regs.h | 27 ++
drivers/gpu/drm/verisilicon/vs_drm.c | 177 ++++++++++
drivers/gpu/drm/verisilicon/vs_drm.h | 29 ++
drivers/gpu/drm/verisilicon/vs_hwdb.c | 150 ++++++++
drivers/gpu/drm/verisilicon/vs_hwdb.h | 29 ++
drivers/gpu/drm/verisilicon/vs_plane.c | 102 ++++++
drivers/gpu/drm/verisilicon/vs_plane.h | 68 ++++
.../gpu/drm/verisilicon/vs_primary_plane.c | 157 +++++++++
.../drm/verisilicon/vs_primary_plane_regs.h | 53 +++
31 files changed, 2348 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/thead,th1520-dw-hdmi.yaml
create mode 100644 Documentation/devicetree/bindings/display/verisilicon,dc.yaml
create mode 100644 drivers/gpu/drm/bridge/th1520-dw-hdmi.c
create mode 100644 drivers/gpu/drm/verisilicon/Kconfig
create mode 100644 drivers/gpu/drm/verisilicon/Makefile
create mode 100644 drivers/gpu/drm/verisilicon/vs_bridge.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_bridge.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_bridge_regs.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_crtc.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_crtc.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_crtc_regs.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_dc.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_dc.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_dc_top_regs.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_drm.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_drm.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_hwdb.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_hwdb.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_plane.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_plane.h
create mode 100644 drivers/gpu/drm/verisilicon/vs_primary_plane.c
create mode 100644 drivers/gpu/drm/verisilicon/vs_primary_plane_regs.h

--
2.52.0