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-rw-r--r--arch/powerpc/sysdev/mpic.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index b9b989d305d..16eb743b38a 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -1331,9 +1331,13 @@ struct mpic * __init mpic_alloc(struct device_node *node,
/*
* By default, the last source number comes from the MPIC, but the
* device-tree and board support code can override it on buggy hw.
+ * If we get passed an isu_size (multi-isu MPIC) then we use that
+ * as a default instead of the value read from the HW.
*/
last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
- >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
+ >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
+ if (isu_size)
+ last_irq = isu_size * MPIC_MAX_ISU - 1;
of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
if (irq_count)
last_irq = irq_count - 1;
@@ -1352,7 +1356,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
mpic->isu_mask = (1 << mpic->isu_shift) - 1;
mpic->irqhost = irq_alloc_host(mpic->node, IRQ_HOST_MAP_LINEAR,
- mpic->isu_size, &mpic_host_ops,
+ last_irq + 1, &mpic_host_ops,
intvec_top + 1);
/*