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[PATCH] libata: ata_piix 450NX errata 

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Alan Cox 2005-12-08 19:22:28 +00:00 committed by Jeff Garzik
parent 9da305eb08
commit c621b14060
1 changed files with 43 additions and 1 deletions
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44
drivers/scsi/ata_piix.c
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@ -619,6 +619,40 @@ static int piix_disable_ahci(struct pci_dev *pdev)
return rc;
}
/**
* piix_check_450nx_errata - Check for problem 450NX setup
*
* Check for the present of 450NX errata #19 and errata #25. If
* they are found return an error code so we can turn off DMA
*/
static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev)
{
struct pci_dev *pdev = NULL;
u16 cfg;
u8 rev;
int no_piix_dma = 0;
while((pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev)) != NULL)
{
/* Look for 450NX PXB. Check for problem configurations
A PCI quirk checks bit 6 already */
pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
pci_read_config_word(pdev, 0x41, &cfg);
/* Only on the original revision: IDE DMA can hang */
if(rev == 0x00)
no_piix_dma = 1;
/* On all revisions below 5 PXB bus lock must be disabled for IDE */
else if(cfg & (1<<14) && rev < 5)
no_piix_dma = 2;
}
if(no_piix_dma)
dev_printk(KERN_WARNING, &ata_dev->dev, "450NX errata present, disabling IDE DMA.\n");
if(no_piix_dma == 2)
dev_printk(KERN_WARNING, &ata_dev->dev, "A BIOS update may resolve this.\n");
return no_piix_dma;
}
/**
* piix_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
@ -693,7 +727,15 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
"combined mode detected (p=%u, s=%u)\n",
pata_chan, sata_chan);
}
if (piix_check_450nx_errata(pdev)) {
/* This writes into the master table but it does not
really matter for this errata as we will apply it to
all the PIIX devices on the board */
port_info[0]->mwdma_mask = 0;
port_info[0]->udma_mask = 0;
port_info[1]->mwdma_mask = 0;
port_info[1]->udma_mask = 0;
}
return ata_pci_init_one(pdev, port_info, 2);
}