intel_cx0_wait_for_ack
ack = intel_cx0_wait_for_ack(encoder, XELPDP_PORT_P2M_COMMAND_READ_ACK, lane, &val);
ack = intel_cx0_wait_for_ack(encoder, XELPDP_PORT_P2M_COMMAND_WRITE_ACK, lane, &val);
int intel_cx0_wait_for_ack(struct intel_encoder *encoder,
ack = intel_cx0_wait_for_ack(encoder, XELPDP_PORT_P2M_COMMAND_WRITE_ACK, lane, &val);