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04bed7922f
Add KUnit coverage for the following MST functions: - dm_dp_aux_transfer(): native read/write, partial write, error result remapping, and HPD disconnect quirk via fake DC link service - dm_dp_aux_transfer_result(): error code translation - dm_dp_aux_fill_payload_flags(): request flag decoding - dm_mst_msg_ready_mask(): ESI mask selection - dm_mst_select_esi_dpcd(): DPCD address/length selection - dm_mst_atomic_best_encoder(): encoder selection by CRTC ID - dm_dp_mst_detect(): unregistered connector early return - dm_dp_mst_atomic_check(): no-old-CRTC early return - dm_dp_create_fake_mst_encoders(): encoder init and CRTC mask - dm_handle_mst_sideband_msg_ready_event(): idle no-ready-bits - retrieve_branch_specific_data(): branch OUI parsing - retrieve_downstream_port_device(): downstream port present - needs_dsc_aux_workaround(): DSC workaround matching - dm_mst_get_pbn_divider(): null link guard - amdgpu_dm_mst_reset_mst_connector_setting(): field reset - dm_dp_mst_is_port_support_mode(): FP-off fallback Assisted-by: Copilot:GPT-5.5 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> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>