drm/amd/display: Test DM early init

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[WHAT]
Add KUnit tests for dm_early_init(), covering the display counts of the
legacy ASICs and the DCN IP versions, a BIOS without an object header,
and an unsupported IP version.

[HOW]
Add a fake ATOM BIOS image whose master data table reports a present
entry, which is all amdgpu_atom_parse_data_header() checks here. Only IP
versions without DMUB firmware are used, so dm_init_microcode() does not
reach a firmware request.

Assisted-by: Copilot:Claude-Opus-5 GPT-5.6-Sol
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Alex Hung 2026-08-13 21:00:45 -06:00 • committed by Alex Deucher

parent 69ec2e82fb

commit bac1f965cc

3 changed files with 172 additions and 2 deletions

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5

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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1

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

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168

drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_test.c

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