DP_LINK_TRAIN_MASK
intel_dp->DP &= ~(DP_PIPE_SEL_MASK | DP_LINK_TRAIN_MASK);
intel_dp->DP &= ~DP_LINK_TRAIN_MASK;
intel_dp->DP &= ~DP_LINK_TRAIN_MASK;
#define DP_LINK_TRAIN_PAT_1 REG_FIELD_PREP(DP_LINK_TRAIN_MASK, 0)
#define DP_LINK_TRAIN_PAT_2 REG_FIELD_PREP(DP_LINK_TRAIN_MASK, 1)
#define DP_LINK_TRAIN_PAT_IDLE REG_FIELD_PREP(DP_LINK_TRAIN_MASK, 2)
#define DP_LINK_TRAIN_OFF REG_FIELD_PREP(DP_LINK_TRAIN_MASK, 3)