[PATCH 0/2] drm: Support HDMI 2.2 FRL rates from the sink

[Fangzhi Zuo <jerry.zuo@amd.com>]

The HDMI 2.2 spec defines three new FRL rates - 16, 20 and 24 Gbps per
lane over 4 lanes (Max_FRL_Rate values 7, 8 and 9 in the HF-SCDB). The
current code stops at the HDMI 2.1 ceiling of 12 Gbps per lane, so a
sink that advertises an HDMI 2.2 rate is treated as having no FRL
support at all and the link ends up trained far below what the sink
actually supports.

Patch 1 teaches the DRM EDID parser to decode the three new rates.
Patch 2 maps them back to the FRL rate index used by DC in amdgpu_dm
and extends the KUnit coverage.

Fangzhi Zuo (2):
  drm/edid: Parse HDMI 2.2 FRL rates from the SCDS
  drm/amd/display: Accept HDMI 2.2 FRL rates from the sink EDID

 .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c |  6 ++++
 .../amdgpu_dm/tests/amdgpu_dm_helpers_test.c  | 30 +++++++++++++++++++
 drivers/gpu/drm/drm_edid.c                    | 12 ++++++++
 3 files changed, 48 insertions(+)

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2.53.0