drm/amd/display: Test EDID helper paths

[WHAT]
Add KUnit tests for three EDID paths in amdgpu_dm_helpers.c the SDC
panel PSR PHY power-down quirk in apply_edid_quirks(), the HDMI
compliance-auto branch of dm_helpers_parse_edid_caps(), and the VBIOS
fallback and corrupt-EDID paths of dm_helpers_read_local_edid().

[HOW]
apply_edid_quirks() is driven twice with the SDC panel ids, once on a
DisplayPort signal and once on eDP, showing the quirk is embedded-only.

dm_helpers_parse_edid_caps() runs against an HDMI connector whose
hdmi_comp_auto flag is set, so the FRL and FRL DSC debug options are
forced on and the quirk is recorded in the panel patch.

dm_helpers_read_local_edid() is given an embedded link with no DDC
line, so it falls back to the EDID hardcoded in the VBIOS embedded
panel info that the existing fake dc_bios supplies. A second test
corrupts the base block checksum served by the fake AUX DDC, so the
read fails, the real checksum is written back and EDID_BAD_CHECKSUM is
reported.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions