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Fix broken pata_via cable detection 

via_do_set_mode overwrites 80-wire cable detection bits. Let's
preserve them.

Signed-off-by: Laurent Riffard <laurent.riffard@free.fr>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Laurent Riffard 2007-09-02 21:01:32 +02:00 committed by Jeff Garzik
parent 897ee77bfb
commit 08ebd43d6b
1 changed files with 10 additions and 3 deletions
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13
drivers/ata/pata_via.c
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@ -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)