diff options
| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-12-03 20:32:13 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2009-12-03 16:13:39 -0500 |
| commit | c4d8a20022e617174eb887c82356d3f513e279a7 (patch) | |
| tree | adf51416fffec4e097fea4743bd94853f30f4079 /drivers/ata/pata_via.c | |
| parent | 750c7136ea873255ed0b74e20f0d3ef9ac8984c0 (diff) | |
| download | lwn-c4d8a20022e617174eb887c82356d3f513e279a7.tar.gz lwn-c4d8a20022e617174eb887c82356d3f513e279a7.zip | |
pata_via: clear UDMA transfer mode bit for PIO and MWDMA
Fix register naming while at it.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/pata_via.c')
| -rw-r--r-- | drivers/ata/pata_via.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c index 78eac276effb..0d97890af681 100644 --- a/drivers/ata/pata_via.c +++ b/drivers/ata/pata_via.c @@ -303,14 +303,21 @@ static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mo } /* Set UDMA unless device is not UDMA capable */ - if (udma_type && t.udma) { - u8 cable80_status; + if (udma_type) { + u8 udma_etc; - /* Get 80-wire cable detection bit */ - pci_read_config_byte(pdev, 0x50 + offset, &cable80_status); - cable80_status &= 0x10; + pci_read_config_byte(pdev, 0x50 + offset, &udma_etc); - pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status); + /* clear transfer mode bit */ + udma_etc &= ~0x20; + + if (t.udma) { + /* preserve 80-wire cable detection bit */ + udma_etc &= 0x10; + udma_etc |= ut; + } + + pci_write_config_byte(pdev, 0x50 + offset, udma_etc); } } |