DP_MAX_DOWNSPREAD
core_link_read_dpcd(link, DP_MAX_DOWNSPREAD,
DP_MAX_DOWNSPREAD - DP_DPCD_REV];
DP_MAX_DOWNSPREAD - DP_DPCD_REV];
(intel_dp->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5);
(dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5;
dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED;