irqchip/versatile-fpga: Fix PCI IRQ mapping on Versatile PB

commit d5d4fdd8 upstream.

This patch is specifically for PCI support on the Versatile PB board using
a DT. Currently, the dynamic IRQ mapping is broken when using DTs. For
example, on QEMU, the SCSI driver is unable to request the IRQ. To fix
this issue, this patch replaces the current dynamic mechanism with a
static value as is done in the non-DT case.
Signed-off-by: Guillaume Delbergue <guillaume.delbergue@greensocs.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[ kamal: backport to 3.13-stable: no parent_irq ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/irqchip/irq-versatile-fpga.c

@@ -193,7 +193,12 @@ int __init fpga_irq_of_init(struct device_node *node,
 	if (of_property_read_u32(node, "valid-mask", &valid_mask))
 		valid_mask = 0;
 
+#ifdef CONFIG_ARCH_VERSATILE
+	fpga_irq_init(base, node->name, IRQ_SIC_START, -1, valid_mask,
+				  node);
+#else
 	fpga_irq_init(base, node->name, 0, -1, valid_mask, node);
+#endif
 
 	writel(clear_mask, base + IRQ_ENABLE_CLEAR);
 	writel(clear_mask, base + FIQ_ENABLE_CLEAR);