diff --git a/drivers/ata/pata_radisys.c b/drivers/ata/pata_radisys.c
index 1956d5c03a7f7b1a1a38dc11a210fce7bc5a1903..4401b332eaab3a51f3e168285c8d8db9e0ad8f8a 100644
--- a/drivers/ata/pata_radisys.c
+++ b/drivers/ata/pata_radisys.c
@@ -217,7 +217,7 @@ static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *e
 	static const struct ata_port_info info = {
 		.flags		= ATA_FLAG_SLAVE_POSS,
 		.pio_mask	= ATA_PIO4,
-		.mwdma_mask	= ATA_MWDMA2, /* mwdma1-2 */
+		.mwdma_mask	= ATA_MWDMA12_ONLY,
 		.udma_mask	= ATA_UDMA24_ONLY,
 		.port_ops	= &radisys_pata_ops,
 	};