Commit c7a42156 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

ahci: disable 64bit dma on sb600 



SB600 claims it can do 64bit DMA but it can't.  Disable it.

Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 55b637c6

drivers/ata/ahci.c

+10 −1
Original line number Diff line number Diff line
@@ -170,6 +170,7 @@ enum { 
	AHCI_FLAG_IGN_IRQ_IF_ERR	= (1 << 25), /* ignore IRQ_IF_ERR */

	AHCI_FLAG_HONOR_PI		= (1 << 26), /* honor PORTS_IMPL */

	AHCI_FLAG_IGN_SERR_INTERNAL	= (1 << 27), /* ignore SERR_INTERNAL */

	AHCI_FLAG_32BIT_ONLY		= (1 << 28), /* force 32bit */



	AHCI_FLAG_COMMON		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |

					  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
@@ -354,7 +355,8 @@ static const struct ata_port_info ahci_port_info[] = { 
	/* board_ahci_sb600 */

	{

		.flags		= AHCI_FLAG_COMMON |

				  AHCI_FLAG_IGN_SERR_INTERNAL,

				  AHCI_FLAG_IGN_SERR_INTERNAL |

				  AHCI_FLAG_32BIT_ONLY,

		.pio_mask	= 0x1f, /* pio0-4 */

		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */

		.port_ops	= &ahci_ops,
@@ -492,6 +494,13 @@ static void ahci_save_initial_config(struct pci_dev *pdev, 
	hpriv->saved_cap = cap = readl(mmio + HOST_CAP);

	hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);



	/* some chips lie about 64bit support */

	if ((cap & HOST_CAP_64) && (pi->flags & AHCI_FLAG_32BIT_ONLY)) {

		dev_printk(KERN_INFO, &pdev->dev,

			   "controller can't do 64bit DMA, forcing 32bit\n");

		cap &= ~HOST_CAP_64;

	}



	/* fixup zero port_map */

	if (!port_map) {

		port_map = (1 << ahci_nr_ports(hpriv->cap)) - 1;