From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Date: Thu, 12 Oct 2017 17:44:47 +0800
Subject: PCI: Disable MSI for Freescale Layerscape PCIe RC mode

Git-commit: 06dc4ee54e306eff61cbdac3593b42b09f618103
Patch-mainline: v4.15-rc1
References: fate#326536

The Freescale PCIe controller advertises the MSI/MSI-X capability in both
RC and Endpoint mode, but in RC mode it doesn't support MSI/MSI-X by
itself; it can only transfer MSI/MSI-X from downstream devices.

Add a quirk to prevent use of MSI/MSI-X in RC mode.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Minghuan Lian <minghuan.Lian@nxp.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/pci/quirks.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4797,6 +4797,14 @@ static void quirk_no_ats(struct pci_dev
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_no_ats);
 #endif /* CONFIG_PCI_ATS */
 
+/* Freescale PCIe doesn't support MSI in RC mode */
+static void quirk_fsl_no_msi(struct pci_dev *pdev)
+{
+	if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
+		pdev->no_msi = 1;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, quirk_fsl_no_msi);
+
 static void quirk_no_ext_tags(struct pci_dev *pdev)
 {
 	struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);