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authorTejun Heo <htejun@gmail.com>2007-05-18 16:23:19 +0200
committerJeff Garzik <jeff@garzik.org>2007-05-21 20:00:25 -0400
commitc7a42156d99bcea7f8173ba7a6034bbaa2ecb77c (patch)
tree7d84ead0d69602cc900e30355ec84132800dea93
parent55b637c6a003a8c4850b41a2c2fd6942d8a7f530 (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>
-rw-r--r--drivers/ata/ahci.c11
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;