[PATCH] libata: ata_piix 450NX errata (c621b140) · Commits · e / devices / android_kernel_teracube_mt6765

drivers/scsi/ata_piix.c

+43 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}