drm/amd/display: Add more KUnit tests for amdgpu_dm_mst_types

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The following existing functions are also exported for the test module:

- needs_dsc_aux_workaround: detect branches needing the DSC AUX workaround
- dm_mst_get_pbn_divider: compute the PBN divider from link bandwidth
- amdgpu_dm_mst_reset_mst_connector_setting: reset per-connector MST state
- retrieve_downstream_port_device: read downstream port presence from DPCD
- retrieve_branch_specific_data: read branch OUI from the upstream device

Several self-contained pieces of logic are extracted from larger functions
into small testable helpers.

- dm_dp_aux_transfer_result: AUX return-code to errno mapping
- dm_dp_aux_fill_payload_flags: AUX request bit decode
- dm_mst_msg_ready_mask: MST sideband ESI mask selection
- dm_mst_select_esi_dpcd: DPCD ESI address/length selection

Assisted-by: Copilot:Claude-Opus-4.6
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>

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Alex Hung 2026-05-29 17:16:58 -06:00 • committed by Alex Deucher

parent 652021e4be

commit 3576a045cd

3 changed files with 491 additions and 49 deletions

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143

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

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12

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

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385

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

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