[PATCH 3/4] pci: mvebu: emulate an empty capability list

[Thomas Petazzoni]

Currently, our PCI-to-PCI bridge emulation doesn't emulate a proper
capability list, which leads 'lspci -v' to show:

  Capabilities: [fc] <chain broken>

In order to fix this, this commit improve the PCI-to-PCI bridge
emulation to emulate an empty capability list. It might be later
extended to expose things like the PCI Express Capability header, but
an empty capability list is sufficient for now.

lspci -v now shows the much nicer:

  Capabilities: [40] #00 [0000]

Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 drivers/pci/host/pci-mvebu.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index c21ca84..c887598 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -440,6 +440,16 @@ static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port,
 		*value = 0;
 		break;
 
+	case PCI_CAPABILITY_LIST:
+		/* Offset of the capability list */
+		*value = 0x40;
+		break;
+
+	case 0x40:
+		/* We have no element in our capability list */
+		*value = 0;
+		break;
+
 	default:
 		*value = 0xffffffff;
 		return PCIBIOS_BAD_REGISTER_NUMBER;
-- 
1.7.9.5