This quirk will disable fast back to back transfer on the secondary bus
segment of the TI Bridge.
Signed-off-by: Gabe Black <gabe.black@xxxxxx>
---
drivers/pci/quirks.c | 19 +++++++++++++++++++
include/linux/pci_ids.h | 1 +
2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 6099fac..efa6534 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -670,6 +670,25 @@ static void __devinit quirk_vt8235_acpi(struct pci_dev *dev)
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235, quirk_vt8235_acpi);
+/*
+ * TI XIO2000a PCIe-PCI Bridge erroneously reports it supports fast back-to-back:
+ * Disable fast back-to-back on the secondary bus segment
+ */
+static void __devinit quirk_xio2000a(struct pci_dev *dev)
+{
+ struct pci_dev *pdev;
+ u16 command;
+
+ dev_warn(&dev->dev, "TI XIO2000a quirk detected; "
+ "secondary bus fast back-to-back transfers disabled\n");
+ list_for_each_entry(pdev, &dev->subordinate->devices, bus_list) {
+ pci_read_config_word(pdev, PCI_COMMAND, &command);
+ if (command & PCI_COMMAND_FAST_BACK)
+ pci_write_config_word(pdev, PCI_COMMAND, command & ~PCI_COMMAND_FAST_BACK);
+ }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_XIO2000A,
+ quirk_xio2000a);
#ifdef CONFIG_X86_IO_APIC
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index da1fda8..f490e7a 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -776,6 +776,7 @@
#define PCI_DEVICE_ID_TI_X515 0x8036
#define PCI_DEVICE_ID_TI_XX12 0x8039
#define PCI_DEVICE_ID_TI_XX12_FM 0x803b
+#define PCI_DEVICE_ID_TI_XIO2000A 0x8231
#define PCI_DEVICE_ID_TI_1130 0xac12
#define PCI_DEVICE_ID_TI_1031 0xac13
#define PCI_DEVICE_ID_TI_1131 0xac15
--
1.6.0.4
--
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