PDAUDIOCF_REG_RDP
inw(chip->port + PDAUDIOCF_REG_RDP));
rdp = inw(chip->port + PDAUDIOCF_REG_RDP);
while (inw(chip->port + PDAUDIOCF_REG_RDP) != inw(chip->port + PDAUDIOCF_REG_WDP)) {