Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c
Commit:     c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c
Parent:     55b637c6a003a8c4850b41a2c2fd6942d8a7f530
Author:     Tejun Heo <[EMAIL PROTECTED]>
AuthorDate: Fri May 18 16:23:19 2007 +0200
Committer:  Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Mon May 21 20:00:25 2007 -0400

    ahci: disable 64bit dma on sb600
    
    SB600 claims it can do 64bit DMA but it can't.  Disable it.
    
    Signed-off-by: Tejun Heo <[EMAIL PROTECTED]>
    Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
 drivers/ata/ahci.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index e00e1b9..bb94047 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -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;
-
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