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via82cxxx: fix UDMA settings programming 

* preserve 80-wire cable detection bit
* don't clear UDMA settings when programming PIO/MWDMA modes

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2010-01-18 07:20:21 +00:00 committed by David S. Miller
parent a354ae8747
commit 68d0a03616
1 changed files with 17 additions and 2 deletions
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19
drivers/ide/via82cxxx.c
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@ -146,10 +146,25 @@ static void via_set_speed(ide_hwif_t *hwif, u8 dn, struct ide_timing *timing)
case ATA_UDMA4: t = timing->udma ? (0xe8 | (clamp_val(timing->udma, 2, 9) - 2)) : 0x0f; break;
case ATA_UDMA5: t = timing->udma ? (0xe0 | (clamp_val(timing->udma, 2, 9) - 2)) : 0x07; break;
case ATA_UDMA6: t = timing->udma ? (0xe0 | (clamp_val(timing->udma, 2, 9) - 2)) : 0x07; break;
default: return;
}
pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
/* Set UDMA unless device is not UDMA capable */
if (vdev->via_config->udma_mask) {
u8 udma_etc;
pci_read_config_byte(dev, VIA_UDMA_TIMING + 3 - dn, &udma_etc);
/* clear transfer mode bit */
udma_etc &= ~0x20;
if (timing->udma) {
/* preserve 80-wire cable detection bit */
udma_etc &= 0x10;
udma_etc |= t;
}
pci_write_config_byte(dev, VIA_UDMA_TIMING + 3 - dn, udma_etc);
}
}
/**