[PATCH 00/18][SRU][G][HWE-5.8] Fix compatibility issue on some external monitors

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1920777

[Impact]
Some external monitors got black screen via HDMI on laptops with Intel
GPU.

[Fix]
Reading more of the port caps and dealing with various clock/bpc
limitations.
Patchset:
https://patchwork.freedesktop.org/series/72928/

[Test Case]
Verified on the target platform and other 2 laptops include workstation,
Tested on LG/ThinkVision 4k monitors and Dell 1080p monitor, include
dock station.
All good.

[Where problems could occur]
Intel GPU may lose or mess the output.

These patches are most backported from 5.10-rc1 and one from 5.11-rc5.
Hirsute/Unstable already got them.

Ville Syrjälä (18):
  drm/i915/lspcon: Do not send infoframes to non-HDMI sinks
  drm/dp: Define protocol converter DPCD registers
  drm/dp: Define more downstream facing port caps
  drm/i915: Reworkd DFP max bpc handling
  drm/dp: Add helpers to identify downstream facing port types
  drm/dp: Pimp drm_dp_downstream_max_bpc()
  drm/dp: Redo drm_dp_downstream_max_clock() as
    drm_dp_downstream_max_dotclock()
  drm/i915: Reworkd DP DFP clock handling
  drm/dp: Add drm_dp_downstream_{min,max}_tmds_clock()
  drm/i915: Deal with TMDS DFP clock limits
  drm/i915: Configure DP 1.3+ protocol converted HDMI mode
  drm/dp: Add drm_dp_downstream_mode()
  drm/i915: Handle downstream facing ports w/o EDID
  drm/i915: Extract intel_hdmi_has_audio()
  drm/i915: DP->HDMI TMDS clock limits vs. deep color
  drm/dp: Add helpers for DFP YCbCr 4:2:0 handling
  drm/i915: Do YCbCr 444->420 conversion via DP protocol converters
  drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting
    YCbCr 4:4:4

 drivers/gpu/drm/drm_dp_helper.c               | 381 ++++++++++++++++--
 drivers/gpu/drm/drm_edid.c                    |  28 ++
 drivers/gpu/drm/i915/display/intel_ddi.c      |  11 +-
 .../drm/i915/display/intel_display_debugfs.c  |   3 +-
 .../drm/i915/display/intel_display_types.h    |   9 +
 drivers/gpu/drm/i915/display/intel_dp.c       | 305 +++++++++++---
 drivers/gpu/drm/i915/display/intel_dp.h       |   2 +
 drivers/gpu/drm/i915/display/intel_hdmi.c     |  82 ++--
 drivers/gpu/drm/i915/display/intel_hdmi.h     |   2 +
 include/drm/drm_dp_helper.h                   |  63 ++-
 include/drm/drm_edid.h                        |   4 +
 11 files changed, 758 insertions(+), 132 deletions(-)

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2.30.2