Broadcom Vulcan bridges have a BAR 0 for internal debug registers. But
writing certain addresses to the BAR can trigger a hardware problem in the
device. Linux doesn't need any BARs on these devices, so we can ignore
them.
Mark these bridges as having non-compliant BARs so the PCI core doesn't
touch them.
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/pci/quirks.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 0575a1e..978c00c 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3705,6 +3705,20 @@ DECLARE_PCI_FIXUP_HEADER(0x1283, 0x8892, quirk_use_pcie_bridge_dma_alias);
DECLARE_PCI_FIXUP_HEADER(0x8086, 0x244e, quirk_use_pcie_bridge_dma_alias);
/*
+ * Writing to BAR 0 on Broadcom Vulcan bridges can trigger a hardware
+ * problem in the device. Linux doesn't need any BARs on these devices, so
+ * mark the device as having non-compliant BARs so we will ignore them.
+ */
+static void quirk_bridge_brcm_vulcan_internal(struct pci_dev *pdev)
+{
+ pdev->non_compliant_bars = 1;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x9000,
+ quirk_bridge_brcm_vulcan_internal);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x9039,
+ quirk_bridge_brcm_vulcan_internal);
+
+/*
* Intersil/Techwell TW686[4589]-based video capture cards have an empty (zero)
* class code. Fix it.
*/
--
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