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drm/amd/display: Add KUnit tests for amdgpu_dm

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Add KUnit tests for pure helper functions in amdgpu_dm.c.

Tests cover:
- dm_plane_layer_index_cmp(): equal, ascending, and descending
  layer_index ordering
- fill_plane_color_attributes(): RGB plus BT601/BT709/BT2020
  full- and limited-range YCbCr, and invalid encoding
- modereset_required(): active vs inactive stream states with
  and without a mode change
- dm_get_oriented_plane_size(): 0/90/180/270 degree rotations
- dm_get_plane_scale(): identity, rotated identity, and
  division-by-zero guard
- is_scaling_state_different(): identical state, scaling mode
  change, and underscan enable/border changes
- is_timing_unchanged_for_freesync(): NULL args, identical
  modes, VRR vtotal/vsync shift, and pixel clock change
- set_freesync_fixed_config(): fixed refresh-rate computation
- is_dc_timing_adjust_needed(): pending hw adjust, VRR
  active-fixed, VRR active-state toggle, and steady state
- set_multisync_trigger_params(): disabled trigger and
  rising/falling edge selection by vsync polarity
- set_master_stream(): highest refresh-rate selection and the
  default-to-first-stream case

Assisted-by: Copilot:Claude-Opus-4.8
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Hung 2026-04-30 15:46:34 -06:00 • committed by Alex Deucher
commit c26b643aa3
5 changed files with 979 additions and 15 deletions
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