MDM_DL
if (read_iir & MDM_DL) {
dc->port[PORT_MDM].token_dl = MDM_DL;
writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
enable_ier = MDM_DL;