drm_dp_update_payload_part1 — Execute payload update part 1
int drm_dp_update_payload_part1 ( | struct drm_dp_mst_topology_mgr * mgr); |
This iterates over all proposed virtual channels, and tries to allocate space in the link for them. For 0->slots transitions, this step just writes the VCPI to the MST device. For slots->0 transitions, this writes the updated VCPIs and removes the remote VC payloads.
after calling this the driver should generate ACT and payload packets.