[PATCH v4 2/3] PCI: Avoid bus reset for Cavium cn8xxx root ports

Jan Glauber jglauber at cavium.com
Fri Sep 8 01:10:32 PDT 2017

From: David Daney <david.daney at cavium.com>

Root ports of cn8xxx do not function after bus reset when used with
some e1000e and LSI HBA devices. Add a quirk to prevent bus reset on
these root ports.

Signed-off-by: David Daney <david.daney at cavium.com>
[jglauber at cavium.com: fixed typo and whitespaces]
Signed-off-by: Jan Glauber <jglauber at cavium.com>
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 140760403f36..2e4e7b6d1a79 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3364,6 +3364,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, quirk_no_bus_reset);
+ * Root port on some Cavium CN8xxx chips do not successfully complete
+ * a bus reset when used with certain types of child devices. Config
+ * space access to the child may quit responding. Flag the root port
+ * as not supporting bus reset.
+ */
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset);
 static void quirk_no_pm_reset(struct pci_dev *dev)

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