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I think that I've found and fixed the problem. There is a copy/paste bug in
vt6421_set_dma_mode() function which causes wrong values to be written to
PATA_UDMA_TIMING register.
This patch fixes a copy/paste bug that breaks DMA modes on VT6421 PATA port.
Signed-off-by: Ondrej Zary <linux@rain...>
Index: linux-2.6.21.7/drivers/ata/sata_via.c
===================================================================
--- linux-2.6.21.7.orig/drivers/ata/sata_via.c
+++ linux-2.6.21.7/drivers/ata/sata_via.c
@@ -380,7 +380,7 @@ static void vt6421_set_dma_mode(struct a
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const u8 udma_bits[] = { 0xEE, 0xE8, 0xE6, 0xE4, 0xE2, 0xE1, 0xE0, 0xE0 };
- pci_write_config_byte(pdev, PATA_UDMA_TIMING, udma_bits[adev->pio_mode - XFER_UDMA_0]);
+ pci_write_config_byte(pdev, PATA_UDMA_TIMING, udma_bits[adev->dma_mode - XFER_UDMA_0]);
}
static int vt6421_port_start(struct ata_port *ap)
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