diff options
| author | Tejun Heo <htejun@gmail.com> | 2007-05-18 16:23:19 +0200 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-05-21 20:00:25 -0400 |
| commit | c7a42156d99bcea7f8173ba7a6034bbaa2ecb77c (patch) | |
| tree | 7d84ead0d69602cc900e30355ec84132800dea93 /drivers/ata/ahci.c | |
| parent | 55b637c6a003a8c4850b41a2c2fd6942d8a7f530 (diff) | |
ahci: disable 64bit dma on sb600
SB600 claims it can do 64bit DMA but it can't. Disable it.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/ahci.c')
| -rw-r--r-- | 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 e00e1b913d2..bb940475d87 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; |