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