diff options
| -rw-r--r-- | drivers/ata/ahci.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 588ab2fd59e7..cb7853b7335d 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -193,6 +193,8 @@ enum { ATA_FLAG_ACPI_SATA | ATA_FLAG_AN | ATA_FLAG_IPM, AHCI_LFLAG_COMMON = ATA_LFLAG_SKIP_D2H_BSY, + + ICH_MAP = 0x90, /* ICH MAP register */ }; struct ahci_cmd_hdr { @@ -2273,6 +2275,22 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) if (rc) return rc; + if (pdev->vendor == PCI_VENDOR_ID_INTEL && + (pdev->device == 0x2652 || pdev->device == 0x2653)) { + u8 map; + + /* ICH6s share the same PCI ID for both piix and ahci + * modes. Enabling ahci mode while MAP indicates + * combined mode is a bad idea. Yield to ata_piix. + */ + pci_read_config_byte(pdev, ICH_MAP, &map); + if (map & 0x3) { + dev_printk(KERN_INFO, &pdev->dev, "controller is in " + "combined mode, can't enable AHCI mode\n"); + return -ENODEV; + } + } + hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL); if (!hpriv) return -ENOMEM; |