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-rw-r--r--drivers/ata/pata_via.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c
index ea18e33f50ef..1b0acafad1a6 100644
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -243,7 +243,6 @@ static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mo
int ut;
int offset = 3 - (2*ap->port_no) - adev->devno;
-
/* Calculate the timing values we require */
ata_timing_compute(adev, mode, &t, T, UT);
@@ -290,9 +289,17 @@ static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mo
ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
break;
}
+
/* Set UDMA unless device is not UDMA capable */
- if (udma_type)
- pci_write_config_byte(pdev, 0x50 + offset, ut);
+ if (udma_type) {
+ u8 cable80_status;
+
+ /* Get 80-wire cable detection bit */
+ pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
+ cable80_status &= 0x10;
+
+ pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status);
+ }
}
static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)