PCI: mvebu: Return 'unsupported' for Interrupt Line and Interrupt Pin

The emulated bridge does not support interrupts, so it should return the
value 0 for Interrupt Line and Interrupt Pin.  This indicates that
interrupts are not supported.

Since Max_Lat and Min_Gnt are also in the same 32-bit word, we return
0 for them, which means "do not care."

This corrects an error message from the kernel:

  pci 0000:00:01.0: of_irq_parse_pci() failed with rc=135

Which is due to the default return of 0xFFFFFFFF indicating that
interrupts are supported.

The error message regression was caused by 16b84e5a505 ("of/irq: Create
of_irq_parse_and_map_pci() to consolidate arch code.")

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index c269e430c760a9bc80ad982db9cb4aa211f16f45..2aa7b77c7c88bab6c2b70b79666205c061afec7d 100644 (file)
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -447,6 +447,11 @@ static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
                *value = 0;
                break;
 
+       case PCI_INTERRUPT_LINE:
+               /* LINE PIN MIN_GNT MAX_LAT */
+               *value = 0;
+               break;
+
        default:
                *value = 0xffffffff;
                return PCIBIOS_BAD_REGISTER_NUMBER;