[PATCH 19/30] PCI: tegra: Use legacy irq for port service drivers

[Manikanta Maddireddy <mmaddireddy@nvidia.com>]

Tegra signals PCIe services like AER, PME, etc over legacy IRQ line.
By default service drivers register interrupt routine over MSI IRQ line,
use pcie_pme_disable_msi() function to disable MSI for service drivers.

PME and AER interrupts registered to MSI without this change
cat /proc/interrupts | grep -i pci
36: 21 0 0 0 0 0 GICv2 104 Level       PCIE
37: 35 0 0 0 0 0 GICv2 105 Level       Tegra PCIe MSI
76: 0  0 0 0 0 0 Tegra PCIe MSI 0 Edge PCIe PME, aerdrv, PCIe BW notif

PME and AER interrupts registered to legacy IRQ with this change
cat /proc/interrupts | grep -i pci
36: 33 0 0 0 0 0 GICv2 104 Level      PCIE, PCIe PME, aerdrv, PCIe BW notif
37: 52 0 0 0 0 0 GICv2 105 Level      Tegra PCIe MSI

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
---
 drivers/pci/controller/pci-tegra.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index dcfe97711cb5..11be88a394e3 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -41,6 +41,7 @@
 #include <soc/tegra/pmc.h>
 
 #include "../pci.h"
+#include "../pcie/portdrv.h"
 
 #define INT_PCI_MSI_NR (8 * 32)
 
@@ -2724,6 +2725,9 @@ static int tegra_pcie_probe(struct platform_device *pdev)
 		goto put_resources;
 	}
 
+	/* PME events are received over legacy INTR, so disable MSI for PME */
+	pcie_pme_disable_msi();
+
 	pm_runtime_enable(pcie->dev);
 	err = pm_runtime_get_sync(pcie->dev);
 	if (err) {
-- 
2.17.1