--- drivers/ata/pata_ali.c

+++ drivers/ata/pata_ali.c

@@ -453,7 +453,9 @@ static void ali_init_chipset(struct pci_

/* Clear CD-ROM DMA write bit */

tmp &= 0x7F;

/* Cable and UDMA */

- pci_write_config_byte(pdev, 0x4B, tmp | 0x09);

+ if (pdev->revision >= 0xc2)

+ tmp |= 0x01;

+ pci_write_config_byte(pdev, 0x4B, tmp | 0x08);

/*

* CD_ROM DMA on (0x53 bit 0). Enable this even if we want

* to use PIO. 0x53 bit 1 (rev 20 only) - enable FIFO control