drm/connector: Add HDMI 2.0 scrambler infrastructure

Add the connector-level infrastructure to support HDMI 2.0 scrambling:

- A drm_connector_hdmi_scrambler_supported() helper to report whether
  the source supports the scrambling capability
- A .scrambler_{enable,disable}() pair of callbacks in
  drm_connector_hdmi_funcs to allow scrambling setup on the source side
- A scrambler_needed flag to be managed by the hdmi state helpers based
  on the negotiated TMDS character rate and the source/sink scrambling
  capabilities
- A scrambler_enabled flag to track whether scrambling is currently
  active
- A delayed work item (scdc_work) to monitor sink-side scrambling status
  and retry the setup if the sink resets it
- A scdc_work_initialized flag to support lazy initialization of the
  work item on the first scrambling enable and guard the teardown paths

These are intended to be used by SCDC scrambling helpers to coordinate
scrambling setup and teardown between the source driver and the DRM
core.

Tested-by: Maud Spierings <maud_spierings@hotmail.com>
Tested-by: Diederik de Haas <diederik@cknow-tech.com>  # NanoPC-T6 LTS, Rock 5B
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Tested-by: Igor Paunovic <royalnet026@gmail.com> # RK3588 Orange Pi 5 Plus, dual HDMI
Tested-by: Robin Räber <robin.raebi@gmail.com>
Link: https://patch.msgid.link/20260901-dw-hdmi-qp-scramb-v11-7-bc12954a0688@collabora.com
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>

0 files changed, 0 insertions, 0 deletions