irqchip/irq-csky-mpintc: Support auto irq deliver to all cpus

The csky,mpintc could deliver a external irq to one cpu or all cpus, but
it couldn't deliver a external irq to a group of cpus with cpu_mask. So
we only use auto deliver mode when affinity mask_val is equal to
cpu_present_mask.

There is no limitation for only two cpus in SMP system.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/drivers/irqchip/irq-csky-mpintc.c b/drivers/irqchip/irq-csky-mpintc.c
index c67c961ab6cc3b828aa128bf939c1c71cb8727d1..a4c1aacba1ff89cea05b9625e36be4b7a6d76609 100644 (file)
--- a/drivers/irqchip/irq-csky-mpintc.c
+++ b/drivers/irqchip/irq-csky-mpintc.c
@@ -89,8 +89,19 @@ static int csky_irq_set_affinity(struct irq_data *d,
        if (cpu >= nr_cpu_ids)
                return -EINVAL;
 
-       /* Enable interrupt destination */
-       cpu |= BIT(31);
+       /*
+        * The csky,mpintc could support auto irq deliver, but it only
+        * could deliver external irq to one cpu or all cpus. So it
+        * doesn't support deliver external irq to a group of cpus
+        * with cpu_mask.
+        * SO we only use auto deliver mode when affinity mask_val is
+        * equal to cpu_present_mask.
+        *
+        */
+       if (cpumask_equal(mask_val, cpu_present_mask))
+               cpu = 0;
+       else
+               cpu |= BIT(31);
 
        writel_relaxed(cpu, INTCG_base + INTCG_CIDSTR + offset);