ATI_REG_CMD_MODEM_SEND1_EN
if (atiixp_read(chip, CMD) & (ATI_REG_CMD_MODEM_SEND1_EN |
atiixp_update(chip, CMD, ATI_REG_CMD_MODEM_SEND1_EN,
on ? ATI_REG_CMD_MODEM_SEND1_EN : 0);