static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct ata_device *adev = qc->dev; struct ata_device *prev = ap->private_data; /* See if the DMA settings could be wrong */ if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { /* Maybe, but do the channels match MWDMA/UDMA ? */ if ((ata_using_udma(adev) && !ata_using_udma(prev)) || (ata_using_udma(prev) && !ata_using_udma(adev))) /* Switch the mode bits */ sc1200_set_dmamode(ap, adev); } return ata_bmdma_qc_issue(qc); }
static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct ata_device *adev = qc->dev; struct ata_device *prev = ap->private_data; if (ata_dma_enabled(adev) && adev != prev && prev != NULL) { if ((ata_using_udma(adev) && !ata_using_udma(prev)) || (ata_using_udma(prev) && !ata_using_udma(adev))) cs5530_set_dmamode(ap, adev); } return ata_bmdma_qc_issue(qc); }
static void atiixp_bmdma_start(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct ata_device *adev = qc->dev; struct pci_dev *pdev = to_pci_dev(ap->host->dev); int dn = (2 * ap->port_no) + adev->devno; u16 tmp16; pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16); if (ata_using_udma(adev)) tmp16 |= (1 << dn); else tmp16 &= ~(1 << dn); pci_write_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, tmp16); ata_bmdma_start(qc); }