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Commit 68d0a036 authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz Committed by David S. Miller
Browse files

via82cxxx: fix UDMA settings programming 



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

Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a354ae87

drivers/ide/via82cxxx.c

+17 −2
Original line number Diff line number Diff line
@@ -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);

	}

}



/**