drm/amd/display: Extract DPRX CRC transition helpers for KUnit testing

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Extract three pure predicate functions from amdgpu_dm_crtc_set_crc_source():
- dm_need_dp_aux
- dm_crc_source_should_start_dprx
- dm_crc_source_should_stop_dprx

Refactor set_crc_source() to use these helpers, replacing the nested
if/else if structure with flat, mutually-exclusive branches driven by
the new predicates.

Add KUnit test cases covering all relevant source combinations for each
helper, including the regression case where DPRX→NONE must trigger
drm_dp_stop_crc().

Assisted-by: Copilot:Claude-Sonnet-4.6
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Alex Hung 2026-05-28 14:01:08 -06:00 • committed by Alex Deucher

parent e561531f2f

commit 29757b93d7

3 changed files with 203 additions and 17 deletions

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92

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

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6

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

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122

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

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