[PATCH] PCI: nVidia quirk to make AER PCI-E extended capability visible

The nVidia CK804 PCI-E chipset supports the AER extended capability
but sometimes fails to link it (with some BIOS or after a warm reboot).
It makes the AER cap invisible to pci_find_ext_capability().

The patch adds a quirk to set the missing bit that controls the
linking of the capability.
By the way, it removes the corresponding code in the myri10ge driver.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Loic Prylli <loic@myri.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 20 insertions, 0 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index aea4d49bcce3..4364d793f73b 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1499,6 +1499,25 @@ static void __devinit quirk_p64h2_1k_io(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   0x1460,         quirk_p64h2_1k_io);
 
+/* Under some circumstances, AER is not linked with extended capabilities.
+ * Force it to be linked by setting the corresponding control bit in the
+ * config space.
+ */
+static void __devinit quirk_nvidia_ck804_pcie_aer_ext_cap(struct pci_dev *dev)
+{
+        uint8_t b;
+        if (pci_read_config_byte(dev, 0xf41, &b) == 0) {
+                if (!(b & 0x20)) {
+                        pci_write_config_byte(dev, 0xf41, b | 0x20);
+                        printk(KERN_INFO
+                               "PCI: Linking AER extended capability on %s\n",
+                               pci_name(dev));
+                }
+        }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA,  PCI_DEVICE_ID_NVIDIA_CK804_PCIE,
+                        quirk_nvidia_ck804_pcie_aer_ext_cap);
+
 EXPORT_SYMBOL(pcie_mch_quirk);
 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pci_fixup_device);
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index e526e7b5ea47..fd54a9d4c3d4 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -1023,6 +1023,7 @@
 #define PCI_DEVICE_ID_NVIDIA_NVENET_8           0x0056
 #define PCI_DEVICE_ID_NVIDIA_NVENET_9           0x0057
 #define PCI_DEVICE_ID_NVIDIA_CK804_AUDIO        0x0059
+#define PCI_DEVICE_ID_NVIDIA_CK804_PCIE         0x005d
 #define PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS      0x0064
 #define PCI_DEVICE_ID_NVIDIA_NFORCE2_IDE        0x0065
 #define PCI_DEVICE_ID_NVIDIA_NVENET_2           0x0066