SPRD_IEN_BREAK_DETECT
ien &= ~(SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT);
iclr |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT;
ien |= SPRD_IEN_BREAK_DETECT | sp->pdata->timeout_ien;