QSFP_CDR_CTRL_BYTE_OFFS
*cdr_ctrl_byte |= (cache[QSFP_CDR_CTRL_BYTE_OFFS] & 0xF0);
u8 cdr_ctrl_byte = cache[QSFP_CDR_CTRL_BYTE_OFFS];
qsfp_write(ppd, ppd->dd->hfi1_id, QSFP_CDR_CTRL_BYTE_OFFS,