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-rw-r--r--drivers/ide/amd74xx.c11
-rw-r--r--drivers/ide/ide-iops.c3
-rw-r--r--drivers/ide/ide-probe.c3
3 files changed, 14 insertions, 3 deletions
diff --git a/drivers/ide/amd74xx.c b/drivers/ide/amd74xx.c
index 81ec73134ed..c6bcd3014a2 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]);
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 5d6ba14e211..142b9573d64 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -468,7 +468,8 @@ int drive_is_ready (ide_drive_t *drive)
* an interrupt with another pci card/device. We make no assumptions
* about possible isa-pnp and pci-pnp issues yet.
*/
- if (hwif->io_ports.ctl_addr)
+ if (hwif->io_ports.ctl_addr &&
+ (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0)
stat = hwif->tp_ops->read_altstatus(hwif);
else
/* Note: this may clear a pending IRQ!! */
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 1649ea54f76..c55bdbd2231 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -266,7 +266,8 @@ static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
/* take a deep breath */
msleep(50);
- if (io_ports->ctl_addr) {
+ if (io_ports->ctl_addr &&
+ (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
a = tp_ops->read_altstatus(hwif);
s = tp_ops->read_status(hwif);
if ((a ^ s) & ~ATA_IDX)