1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/ide/amd74xx.c b/drivers/ide/amd74xx.c
index 81ec73134eda..c6bcd3014a29 100644
--- a/drivers/ide/amd74xx.c
+++ b/drivers/ide/amd74xx.c
@@ -3,7 +3,7 @@
  * IDE driver for Linux.
  *
  * Copyright (c) 2000-2002 Vojtech Pavlik
- * Copyright (c) 2007 Bartlomiej Zolnierkiewicz
+ * Copyright (c) 2007-2008 Bartlomiej Zolnierkiewicz
  *
  * Based on the work of:
  *      Andre Hedrick
@@ -263,6 +263,15 @@ static int __devinit amd74xx_probe(struct pci_dev *dev, const struct pci_device_
                         d.udma_mask = ATA_UDMA5;
         }
 
+        /*
+         * It seems that on some nVidia controllers using AltStatus
+         * register can be unreliable so default to Status register
+         * if the device is in Compatibility Mode.
+         */
+        if (dev->vendor == PCI_VENDOR_ID_NVIDIA &&
+            ide_pci_is_in_compatibility_mode(dev))
+                d.host_flags |= IDE_HFLAG_BROKEN_ALTSTATUS;
+
         printk(KERN_INFO "%s %s: UDMA%s controller\n",
                 d.name, pci_name(dev), amd_dma[fls(d.udma_mask) - 1]);