amd74xx: workaround unreliable AltStatus register for nVidia controllers

It seems that on some nVidia controllers using AltStatus register
can be unreliable so default to Status register if the PCI device
is in Compatibility Mode.  In order to achieve this:

* Add ide_pci_is_in_compatibility_mode() inline helper to <linux/ide.h>.

* Add IDE_HFLAG_BROKEN_ALTSTATUS host flag and set it in amd74xx host
  driver for nVidia controllers in Compatibility Mode.

* Teach actual_try_to_identify() and drive_is_ready() about the new flag.

This fixes the regression caused by removal of CONFIG_IDEPCI_SHARE_IRQ
config option in 2.6.25 and using AltStatus register unconditionally when
available (kernel.org bugs #11659 and #10216).

[ Moreover for CONFIG_IDEPCI_SHARE_IRQ=y (which is what most people
  and distributions use) it never worked correctly. ]

Thanks to Remy LABENE and Lars Winterfeld for help with debugging the problem.

More info at:
http://bugzilla.kernel.org/show_bug.cgi?id=11659
http://bugzilla.kernel.org/show_bug.cgi?id=10216

Reported-by: Remy LABENE <remy.labene@free.fr>
Tested-by: Remy LABENE <remy.labene@free.fr>
Tested-by: Lars Winterfeld <lars.winterfeld@tu-ilmenau.de>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 14 insertions, 3 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]);
 
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 5d6ba14e211d..142b9573d64c 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 1649ea54f76c..c55bdbd22314 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)