1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index c729e6988bbb..bce26ee3806e 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -610,6 +610,15 @@ module_param(ahci_em_messages, int, 0444);
 MODULE_PARM_DESC(ahci_em_messages,
         "Set AHCI Enclosure Management Message type (0 = disabled, 1 = LED");
 
+#if defined(CONFIG_PATA_MARVELL) || defined(CONFIG_PATA_MARVELL_MODULE)
+static int marvell_enable;
+#else
+static int marvell_enable = 1;
+#endif
+module_param(marvell_enable, int, 0644);
+MODULE_PARM_DESC(marvell_enable, "Marvell SATA via AHCI (1 = enabled)");
+
+
 static inline int ahci_nr_ports(u32 cap)
 {
         return (cap & 0x1f) + 1;
@@ -732,6 +741,8 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
                            "MV_AHCI HACK: port_map %x -> %x\n",
                            port_map,
                            port_map & mv);
+                dev_printk(KERN_ERR, &pdev->dev,
+                          "Disabling your PATA port. Use the boot option 'ahci.marvell_enable=0' to avoid this.\n");
 
                 port_map &= mv;
         }
@@ -2533,6 +2544,12 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         if (!printed_version++)
                 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
 
+        /* The AHCI driver can only drive the SATA ports, the PATA driver
+           can drive them all so if both drivers are selected make sure
+           AHCI stays out of the way */
+        if (pdev->vendor == PCI_VENDOR_ID_MARVELL && !marvell_enable)
+                return -ENODEV;
+
         /* acquire resources */
         rc = pcim_enable_device(pdev);
         if (rc)