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@xxxxxxxxxx>
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
---
V4: No change
V3: Corrected typo in commit log
V2: No change
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 ac57c5badd9b..0024bc42b400 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)
@@ -2725,6 +2726,9 @@ static int tegra_pcie_probe(struct platform_device *pdev)
goto put_resources;
}
+ /* Switch to legacy IRQ for PCIe services like AER, PME*/
+ pcie_pme_disable_msi();
+
pm_runtime_enable(pcie->dev);
err = pm_runtime_get_sync(pcie->dev);
if (err) {
--
2.17.1
