1.Read the DPCD capabilities fields out of the sink device (0x00000–0x0000B) through the AUX channel. See Table: HPD Assertion.
2.Determine values for lane count, link speed, enhanced framing mode, downspread control, and main link channel code based on each link partners' capability and needs.
3.Write the configuration parameters to the link configuration field (0x00100–0x00101) of the DPCD through the AUX channel.
Note: Some sink devices' DPCD capability fields are unreliable. Many source devices start with the maximum transmitter capabilities and scale back as necessary to find a configuration the sink device can handle. This could be an advisable strategy instead of relying on DPCD values.
4.Equivalently, write the appropriate values to the source controller's local configuration space.