[PATCH 00/14] Add initial support for the Rockchip RK3588 HDMI TX Controller

Cristian Ciocaltea
2024-06-01T13:13:19Z

The RK3588 SoC family integrates a Quad-Pixel (QP) variant of the
Synopsys DesignWare HDMI TX controller used in the previous SoCs.

It is HDMI 2.1 compliant and supports the following features, among
others:

* Fixed Rate Link (FRL)
* 4K@120Hz and 8K@60Hz video modes
* Variable Refresh Rate (VRR) including Quick Media Switching (QMS)
* Fast Vactive (FVA)
* SCDC I2C DDC access
* TMDS Scrambler enabling 2160p@60Hz with RGB/YCbCr4:4:4
* YCbCr4:2:0 enabling 2160p@60Hz at lower HDMI link speeds
* Multi-stream audio
* Enhanced Audio Return Channel (EARC)

This is the last required component that needs to be supported in order
to enable the HDMI output functionality on the RK3588 based SBCs, such
as the RADXA Rock 5B. The other components are the Video Output
Processor (VOP2) and the Samsung IP based HDMI/eDP TX Combo PHY, for
which basic support has been already made available via [1] and [2],
respectively.

The patches are grouped as follows:
* PATCH 1..7: DW HDMI TX driver refactor to minimize code duplication in
the new QP driver (no functional changes intended)

* PATCH 8..11: Rockchip DW HDMI glue driver cleanup/improvements (no
functional changes intended)

* PATCH 12..13: The new DW HDMI QP TX driver reusing the previously
exported functions and structs from existing DW HDMI TX driver

* PATCH 14: Rockchip DW HDMI glue driver update to support RK3588 and
make use of DW HDMI QP TX

They provide just the basic HDMI support for now, i.e. RGB output up to
4K@60Hz, without audio, CEC or any of the HDMI 2.1 specific features.
Also note the vop2 driver is currently not able to properly handle all
display modes supported by the connected screens, e.g. it doesn't cope
with non-integer refresh rates.

A possible workaround consists of enabling the display controller to
make use of the clock provided by the HDMI PHY PLL. This is still work
in progress and will be submitted later, as well as the required DTS
updates.

To facilitate testing and experimentation, all HDMI output related
patches, including those part of this series, are available at [3].
So far I could only verify this on the RADXA Rock 3A and 5B boards.

Thanks,
Cristian

[1]: 5a028e8f062f ("drm/rockchip: vop2: Add support for rk3588")
[2]: 553be2830c5f ("phy: rockchip: Add Samsung HDMI/eDP Combo PHY driver")
[3]: https://gitlab.collabora.com/hardware-enablement/rockchip-3588/linux/-/commits/rk3588-hdmi-bridge-v6.10-rc1

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
---
Cristian Ciocaltea (14):
drm/bridge: dw-hdmi: Simplify clock handling
drm/bridge: dw-hdmi: Add dw-hdmi-common.h header
drm/bridge: dw-hdmi: Commonize dw_hdmi_i2c_adapter()
drm/bridge: dw-hdmi: Factor out AVI infoframe setup
drm/bridge: dw-hdmi: Factor out vmode setup
drm/bridge: dw-hdmi: Factor out hdmi_data_info setup
drm/bridge: dw-hdmi: Commonize dw_hdmi_connector_create()
drm/rockchip: dw_hdmi: Use modern drm_device based logging
drm/rockchip: dw_hdmi: Simplify clock handling
drm/rockchip: dw_hdmi: Use devm_regulator_get_enable()
drm/rockchip: dw_hdmi: Drop superfluous assignments of mpll_cfg, cur_ctr and phy_config
dt-bindings: display: rockchip,dw-hdmi: Add compatible for RK3588
drm/bridge: synopsys: Add DW HDMI QP TX controller driver
drm/rockchip: dw_hdmi: Add basic RK3588 support

.../display/rockchip/rockchip,dw-hdmi.yaml | 127 +++-
drivers/gpu/drm/bridge/synopsys/Makefile | 2 +-
drivers/gpu/drm/bridge/synopsys/dw-hdmi-common.h | 179 +++++
drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c | 787 +++++++++++++++++++
drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h | 831 +++++++++++++++++++++
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 353 +++------
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 351 +++++++--
include/drm/bridge/dw_hdmi.h | 8 +
8 files changed, 2290 insertions(+), 348 deletions(-)
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base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
change-id: 20240601-b4-rk3588-bridge-upstream-a27baff1b8fc