[PATCH v2 00/13] drm: Add generic helpers for HDMI scrambling

[Maxime Ripard <maxime@cerno.tech>]

Hi,

This is a follow-up of the work to support the interactions between the hotplug
and the scrambling support for vc4:

https://lore.kernel.org/dri-devel/20210507150515.257424-11-maxime@cerno.tech/
https://lore.kernel.org/dri-devel/20211025152903.1088803-10-maxime@cerno.tech/

Ville feedback was that the same discussion happened some time ago for i915,
and resulted in a function to do an full disable/enable cycle on reconnection
to avoid breaking the HDMI 2.0 spec.

This series improves the current scrambling support by adding generic helpers
for usual scrambling-related operations, and builds upon them to provide a
generic alternative to intel_hdmi_reset_link.

Let me know what you think,
Maxime

Changes from v1:
  - Dropped the 340MHz define
  - Make drm_mode_hdmi_requires_scrambling use the bpc
  - Make more drm_display_mode const in vc4
  - Dropped the tegra conversion
  - Added more comments

Maxime Ripard (13):
  drm/connector: Add helper to check if a mode requires scrambling
  drm/atomic: Add HDMI scrambler state helper
  drm/atomic: Add HDMI reset link helper
  drm/scdc: Document hotplug gotchas
  drm/vc4: hdmi: Constify drm_display_mode
  drm/vc4: hdmi: Remove unused argument in vc4_hdmi_supports_scrambling
  drm/vc4: hdmi: Remove mutex in detect
  drm/vc4: hdmi: Remove HDMI flag from encoder
  drm/vc4: hdmi: Simplify the hotplug handling
  drm/vc4: hdmi: Simplify the connector state retrieval
  drm/vc4: hdmi: Switch to detect_ctx
  drm/vc4: hdmi: Leverage new SCDC atomic_check
  drm/vc4: hdmi: Reset link on hotplug

 drivers/gpu/drm/drm_atomic_helper.c       | 109 +++++++++
 drivers/gpu/drm/drm_atomic_state_helper.c |  58 +++++
 drivers/gpu/drm/drm_scdc_helper.c         |  13 ++
 drivers/gpu/drm/vc4/vc4_hdmi.c            | 257 ++++++++++------------
 drivers/gpu/drm/vc4/vc4_hdmi.h            |  19 +-
 include/drm/drm_atomic_helper.h           |   3 +
 include/drm/drm_atomic_state_helper.h     |   3 +
 include/drm/drm_connector.h               |  25 +++
 include/drm/drm_modes.h                   |  20 ++
 9 files changed, 353 insertions(+), 154 deletions(-)

-- 
2.33.1