IDE HDD does not work if it uses a 40-pin PATA cable on ATI chipset.
This patch fixes the bug.
Signed-off-by: Conke Hu <[EMAIL PROTECTED]>
-----------------------
--- linux-2.6.20-rc3-git4/drivers/ide/pci/atiixp.c.2 2007-01-06
19:19:35.000000000 +0800
+++ linux-2.6.20-rc3-git4/drivers/ide/pci/atiixp.c 2007-01-06
19:22:34.000000000 +0800
@@ -289,8 +289,12 @@ fast_ata_pio:
static void __devinit init_hwif_atiixp(ide_hwif_t *hwif)
{
+ u8 udma_mode = 0;
+ u8 ch = hwif->channel;
+ struct pci_dev *pdev = hwif->pci_dev;
+
if (!hwif->irq)
- hwif->irq = hwif->channel ? 15 : 14;
+ hwif->irq = ch ? 15 : 14;
hwif->autodma = 0;
hwif->tuneproc = &atiixp_tuneproc;
@@ -306,8 +310,12 @@ static void __devinit init_hwif_atiixp(i
hwif->mwdma_mask = 0x06;
hwif->swdma_mask = 0x04;
- /* FIXME: proper cable detection needed */
- hwif->udma_four = 1;
+ pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ch, &udma_mode);
+ if ((udma_mode & 0x07) >= 0x04 || (udma_mode & 0x70) >= 0x40)
+ hwif->udma_four = 1;
+ else
+ hwif->udma_four = 0;
+
hwif->ide_dma_host_on = &atiixp_ide_dma_host_on;
hwif->ide_dma_host_off = &atiixp_ide_dma_host_off;
hwif->ide_dma_check = &atiixp_dma_check;
-
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