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Subject[PATCH 4.10 098/110] PCI: Add Broadcom Northstar2 PAXC quirk for device class and MPSS
Date
4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jon Mason <jon.mason@broadcom.com>

[ Upstream commit ce709f86501a013e941e9986cb072eae375ddf3e ]

The Broadcom Northstar2 SoC has a number of quirks for the PAXC
(internal/fake) PCI bus. Specifically, the PCI config space is shared
between the root port and the first PF (ie., PF0), and a number of fields
are tied to zero (thus preventing them from being set). These cannot be
"fixed" in device firmware, so we must fix them with a quirk.

Signed-off-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pci/quirks.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2240,6 +2240,27 @@ DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_B
PCI_DEVICE_ID_TIGON3_5719,
quirk_brcm_5719_limit_mrrs);

+#ifdef CONFIG_PCIE_IPROC_PLATFORM
+static void quirk_paxc_bridge(struct pci_dev *pdev)
+{
+ /* The PCI config space is shared with the PAXC root port and the first
+ * Ethernet device. So, we need to workaround this by telling the PCI
+ * code that the bridge is not an Ethernet device.
+ */
+ if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+ pdev->class = PCI_CLASS_BRIDGE_PCI << 8;
+
+ /* MPSS is not being set properly (as it is currently 0). This is
+ * because that area of the PCI config space is hard coded to zero, and
+ * is not modifiable by firmware. Set this to 2 (e.g., 512 byte MPS)
+ * so that the MPS can be set to the real max value.
+ */
+ pdev->pcie_mpss = 2;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x16cd, quirk_paxc_bridge);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x16f0, quirk_paxc_bridge);
+#endif
+
/* Originally in EDAC sources for i82875P:
* Intel tells BIOS developers to hide device 6 which
* configures the overflow device access containing

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