linux-kernel - [PATCH 2/2] PCI: Avoid bus reset for Cavium cn8xxx root ports.

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Message-Id: <20170516001736.4001-3-david.daney@cavium.com>
Date:   Mon, 15 May 2017 17:17:36 -0700
From:   David Daney <david.daney@...ium.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Jon Masters <jcm@...hat.com>,
        Robert Richter <robert.richter@...ium.com>,
        David Daney <david.daney@...ium.com>
Subject: [PATCH 2/2] PCI: Avoid bus reset for Cavium cn8xxx root ports.

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@...ium.com>
---
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 085fb78..02cd847 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3347,6 +3347,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0032, quirk_no_bus_reset);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003c, quirk_no_bus_reset);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0033, quirk_no_bus_reset);
 
+/*
+ * Root port on some Cavium CN8xxx chips do not successfully complete
+ * a bus reset when used with certain types 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)
 {
 	/*
-- 
2.9.4