diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 75915b3..837ad15 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -212,8 +212,14 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 	if (!pcie_port_enable_msix(dev, irqs, mask))
 		return 0;
 
-	/* We're not going to use MSI-X, so try MSI and fall back to INTx */
-	if (!pci_enable_msi(dev) || dev->pin)
+	/*
+	 * We're not going to use MSI-X, so try MSI and fall back to INTx.
+	 * Eventually, if neither MSI/MSI-X nor INTx available, try other
+	 * interrupt. (On some platforms, root port doesn't support generating
+	 * MSI/MSI-X/INTx in RC mode)
+	 */
+	if (!pci_enable_msi(dev) || dev->pin || ((dev->dev_flags &
+			PCI_DEV_FLAGS_USE_NON_MSI_INTX_IRQ) && dev->irq))
 		irq = dev->irq;
 
  no_msi:
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 2a75216..2922cb8 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2640,6 +2640,15 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0x1083,
 			quirk_msi_intx_disable_bug);
 #endif /* CONFIG_PCI_MSI */
 
+/*
+ * Under some circumstances, root port has neither MSI/MSI-X nor INTx generated,
+ * so try other interrupt if supported.
+ */
+void __devinit quirk_enable_non_msi_intx_interrupt(struct pci_dev *dev)
+{
+	dev->dev_flags |= PCI_DEV_FLAGS_USE_NON_MSI_INTX_IRQ;
+}
+
 /* Allow manual resource allocation for PCI hotplug bridges
  * via pci=hpmemsize=nnM and pci=hpiosize=nnM parameters. For
  * some PCI-PCI hotplug bridges, like PLX 6254 (former HINT HB6),
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d8c379d..f051a66 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -176,6 +176,11 @@ enum pci_dev_flags {
 	PCI_DEV_FLAGS_NO_D3 = (__force pci_dev_flags_t) 2,
 	/* Provide indication device is assigned by a Virtual Machine Manager */
 	PCI_DEV_FLAGS_ASSIGNED = (__force pci_dev_flags_t) 4,
+	/*
+	 * Use other interrupt (i.e. system shared interrupt) when MSI/MSI-X
+	 * and INTx are not supported in RC mode on some platforms.
+	 */
+	PCI_DEV_FLAGS_USE_NON_MSI_INTX_IRQ = (__force pci_dev_flags_t) 8,
 };
 
 enum pci_irq_reroute_variant {