[PATCH 0/2] Initial support for Synopsys DW HDMI QP TX Controller

[Cristian Ciocaltea]

The Synopsys DesignWare HDMI 2.1 Quad-Pixel (QP) TX Controller IP can
found on the Rockchip RK3588 SoC family and supports the following
features, among others:

* Fixed Rate Link (FRL)
* Display Stream Compression (DSC)
* 4K at 120Hz and 8K at 60Hz video modes
* Variable Refresh Rate (VRR) including Quick Media Switching (QMS)
* Fast Vactive (FVA)
* Multi-stream audio
* Enhanced Audio Return Channel (EARC)

This patch series provides just the basic support, i.e. RGB output up to
4K at 60Hz, without audio, CEC or any HDMI 2.1 related functionality.

Please note it is a reworked version of [1], which relied on a
commonized dw-hdmi approach.  Since the overall consensus was to handle
it as an entirely new IP, I dropped all references and dependencies to
the existing dw-hdmi driver code.

This has been submitted as a separate patchset, as suggested by Neil;
the Rockchip platform specific glue code enabling HDMI output for RK3588
will be send as v2 of the initial patch series [2].

Some additional changes worth mentioning:
* Making use of the new bridge HDMI helpers indicated by Dmitry
* Dropped connector creation to ensure driver does only support
  DRM_BRIDGE_ATTACH_NO_CONNECTOR
* Updated I2C segment handling to properly handle connected DVI displays
  (reported and fixed by Heiko)

[1]: https://lore.kernel.org/lkml/20240601-b4-rk3588-bridge-upstream-v1-13-f6203753232b@collabora.com/
[2]: https://lore.kernel.org/lkml/20240601-b4-rk3588-bridge-upstream-v1-0-f6203753232b@collabora.com/

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea at collabora.com>
---
Cristian Ciocaltea (2):
      dt-bindings: display: bridge: Add schema for Synopsys DW HDMI QP TX IP
      drm/bridge: synopsys: Add DW HDMI QP TX Controller driver

 .../display/bridge/synopsys,dw-hdmi-qp.yaml        |  66 ++
 drivers/gpu/drm/bridge/synopsys/Kconfig            |   8 +
 drivers/gpu/drm/bridge/synopsys/Makefile           |   2 +
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c       | 748 ++++++++++++++++++
 drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.h       | 834 +++++++++++++++++++++
 include/drm/bridge/dw_hdmi_qp.h                    |  37 +
 6 files changed, 1695 insertions(+)
---
base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b
change-id: 20240801-dw-hdmi-qp-tx-943992731570