REG_DP_AUX_TRANS_CTRL
msm_dp_write_aux(aux, REG_DP_AUX_TRANS_CTRL, 0);
msm_dp_write_aux(aux, REG_DP_AUX_TRANS_CTRL, reg);
data = msm_dp_read_aux(aux, REG_DP_AUX_TRANS_CTRL);
msm_dp_write_aux(aux, REG_DP_AUX_TRANS_CTRL, data);