From c4d8a20022e617174eb887c82356d3f513e279a7 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Thu, 3 Dec 2009 20:32:13 +0100 Subject: [PATCH] pata_via: clear UDMA transfer mode bit for PIO and MWDMA Fix register naming while at it. Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Jeff Garzik --- drivers/ata/pata_via.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/ata/pata_via.c b/drivers/ata/pata_via.c index 78eac276eff..0d97890af68 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); } }