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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>
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55b637c6a0
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c7a42156d9
@ -170,6 +170,7 @@ enum {
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AHCI_FLAG_IGN_IRQ_IF_ERR = (1 << 25), /* ignore IRQ_IF_ERR */
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AHCI_FLAG_HONOR_PI = (1 << 26), /* honor PORTS_IMPL */
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AHCI_FLAG_IGN_SERR_INTERNAL = (1 << 27), /* ignore SERR_INTERNAL */
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AHCI_FLAG_32BIT_ONLY = (1 << 28), /* force 32bit */
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AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
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ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
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@ -354,7 +355,8 @@ static const struct ata_port_info ahci_port_info[] = {
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/* board_ahci_sb600 */
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{
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.flags = AHCI_FLAG_COMMON |
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AHCI_FLAG_IGN_SERR_INTERNAL,
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AHCI_FLAG_IGN_SERR_INTERNAL |
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AHCI_FLAG_32BIT_ONLY,
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.pio_mask = 0x1f, /* pio0-4 */
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.udma_mask = 0x7f, /* udma0-6 ; FIXME */
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.port_ops = &ahci_ops,
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@ -492,6 +494,13 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
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hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
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hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
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/* some chips lie about 64bit support */
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if ((cap & HOST_CAP_64) && (pi->flags & AHCI_FLAG_32BIT_ONLY)) {
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dev_printk(KERN_INFO, &pdev->dev,
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"controller can't do 64bit DMA, forcing 32bit\n");
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cap &= ~HOST_CAP_64;
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}
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/* fixup zero port_map */
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if (!port_map) {
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port_map = (1 << ahci_nr_ports(hpriv->cap)) - 1;
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