PHY_POWERDOWN
regmap_update_bits(dp->regmap, DW_DP_PHYIF_CTRL, PHY_POWERDOWN,
FIELD_PREP(PHY_POWERDOWN, 0x3));
regmap_update_bits(dp->regmap, DW_DP_PHYIF_CTRL, PHY_POWERDOWN,
FIELD_PREP(PHY_POWERDOWN, 0x0));