[PATCH 82/86] pata_via: clear UDMA transfer mode bit for PIO and MWDMA

Bartlomiej Zolnierkiewicz
2009-11-25T17:13:03Z

From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: [PATCH] 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>
---
drivers/ata/pata_via.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)

Index: b/drivers/ata/pata_via.c
===================================================================
--- a/drivers/ata/pata_via.c
+++ b/drivers/ata/pata_via.c
@@ -296,14 +296,21 @@ static void via_do_set_mode(struct ata_p
}

/* 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);
}
}