From f407dae76040c9529c2c83b1488dda4ffc54522c Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Date: Tue, 26 Nov 2013 11:27:28 -0700
Subject: [PATCH] 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>
---
drivers/pci/host/pci-mvebu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index c269e430c760a..2aa7b77c7c88b 100644
--- 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;
--
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