DP_LINK_RATE_SET
core_link_read_dpcd(link, DP_LINK_RATE_SET,
status = core_link_write_dpcd(link, DP_LINK_RATE_SET,
DP_LINK_RATE_SET,
core_link_read_dpcd(link, DP_LINK_RATE_SET,
drm_dp_dpcd_writeb(&intel_dp->aux, DP_LINK_RATE_SET, rate_select);