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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 16b84e5a50 ("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>
This commit is contained in:
Jason Gunthorpe 2013-11-26 11:27:28 -07:00 committed by Bjorn Helgaas
parent ecf61c78bd
commit f407dae760
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/host/pci-mvebu.c
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@ -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;