[PATCH pci/host-iproc] pci-iproc: skip check for legacy IRQ on PAXC buses

[gospo@broadcom.com (Andy Gospodarek)]

PAXC and PAXCv2 buses do not support legacy IRQs so there is no reason
to even try and map them.  Without a change like this, one cannot create
VFs on Nitro ports since legacy interrupts are checked as part of the
PCI device creation process.  Testing on PAXC hardware showed that VFs
are properly created with only the change to not set pcie->map_irq, but
just to be safe the change in iproc_pcie_setup will ensure that
pdev_fixup_irq will not panic.

Signed-off-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Ray Jui <rjui@broadcom.com>
---
 drivers/pci/host/pcie-iproc-platform.c | 9 ++++++++-
 drivers/pci/host/pcie-iproc.c          | 5 ++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
index fd3ed9b..22d814a 100644
--- a/drivers/pci/host/pcie-iproc-platform.c
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -108,7 +108,14 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	pcie->map_irq = of_irq_parse_and_map_pci;
+	/* PAXC doesn't support legacy IRQs, skip mapping */
+	switch (pcie->type) {
+	case IPROC_PCIE_PAXC:
+	case IPROC_PCIE_PAXC_V2:
+		break;
+	default:
+		pcie->map_irq = of_irq_parse_and_map_pci;
+	}
 
 	ret = iproc_pcie_setup(pcie, &res);
 	if (ret)
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index cd51334..3ebc025 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -1274,7 +1274,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 
 	pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
-	pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
+
+	if (pcie->map_irq)
+		pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
+
 	pci_bus_add_devices(bus);
 
 	return 0;
-- 
2.1.0