diff options
| author | Laurent Riffard <laurent.riffard@free.fr> | 2007-09-02 21:01:32 +0200 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-09-10 21:50:24 -0400 |
| commit | 08ebd43d6b9b63de681b8f255c0fabae8033527c (patch) | |
| tree | be2669523b6f147c801d89cac26c709349163a68 /drivers | |
| parent | 897ee77bfba12b83752027427a41009961458ee6 (diff) | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/pata_via.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c index ea18e33f50e..1b0acafad1a 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) |