ata_piix: implement IOCFG bit18 quirk (43a98f05) · Commits · 戴 / test

drivers/ata/ata_piix.c

+36 −0

Original line number	Diff line number	Diff line
		@@ -1173,6 +1173,39 @@ static void __devinit piix_init_sata_map(struct pci_dev *pdev,
		hpriv->map = map;
		}

		static void piix_iocfg_bit18_quirk(struct pci_dev *pdev)
		{
		static struct dmi_system_id sysids[] = {
		{
		/* Clevo M570U sets IOCFG bit 18 if the cdrom
		* isn't used to boot the system which
		* disables the channel.
		*/
		.ident = "M570U",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Clevo Co."),
		DMI_MATCH(DMI_PRODUCT_NAME, "M570U"),
		},
		},
		};
		u32 iocfg;

		if (!dmi_check_system(sysids))
		return;

		/* The datasheet says that bit 18 is NOOP but certain systems
		* seem to use it to disable a channel. Clear the bit on the
		* affected systems.
		*/
		pci_read_config_dword(pdev, PIIX_IOCFG, &iocfg);
		if (iocfg & (1 << 18)) {
		dev_printk(KERN_INFO, &pdev->dev,
		"applying IOCFG bit18 quirk\n");
		iocfg &= ~(1 << 18);
		pci_write_config_dword(pdev, PIIX_IOCFG, iocfg);
		}
		}

		/**
		* piix_init_one - Register PIIX ATA PCI device with kernel services
		* @pdev: PCI device to register
		@@ -1234,6 +1267,9 @@ static int piix_init_one (struct pci_dev pdev, const struct pci_device_id ent)
		piix_map_db_table[ent->driver_data]);
		}

		/* apply IOCFG bit18 quirk */
		piix_iocfg_bit18_quirk(pdev);

		/* On ICH5, some BIOSen disable the interrupt using the
		* PCI_COMMAND_INTX_DISABLE bit added in PCI 2.3.
		* On ICH6, this bit has the same effect, but only when