prep_regw(&cmd[i++], REG_FETCH_SAMPLES, devc->magic_fetch_samples + 0x01);
prep_regw(&cmd[i++], REG_FETCH_SAMPLES, devc->magic_fetch_samples | 0x02);
prep_regw(&cmd[i++], REG_FETCH_SAMPLES, devc->magic_fetch_samples + 0x01);
prep_regw(&cmd[i++], REG_FETCH_SAMPLES, devc->magic_fetch_samples | 0x02);