[AVR32] Set flow handler for external interrupts

Make sure that the flow handler for external interrupts is updated
whenever they type is changed. Also make sure that the defaults
correspond with how the interrupt controller is configured.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

arch/avr32/mach-at32ap/extint.c

@@ -49,12 +49,25 @@ static void eim_unmask_irq(unsigned int irq)
 static int eim_set_irq_type(unsigned int irq, unsigned int flow_type)
 {
 	struct at32_sm *sm = get_irq_chip_data(irq);
+	struct irq_desc *desc;
 	unsigned int i = irq - sm->eim_first_irq;
 	u32 mode, edge, level;
 	unsigned long flags;
 	int ret = 0;
 
-	flow_type &= IRQ_TYPE_SENSE_MASK;
+	if (flow_type == IRQ_TYPE_NONE)
+		flow_type = IRQ_TYPE_LEVEL_LOW;
+
+	desc = &irq_desc[irq];
+	desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
+	desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
+
+	if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) {
+		desc->status |= IRQ_LEVEL;
+		set_irq_handler(irq, handle_level_irq);
+	} else {
+		set_irq_handler(irq, handle_edge_irq);
+	}
 
 	spin_lock_irqsave(&sm->lock, flags);
 
@@ -148,10 +161,15 @@ static int __init eim_init(void)
 	pattern = sm_readl(sm, EIM_MODE);
 	nr_irqs = fls(pattern);
 
+	/* Trigger on falling edge unless overridden by driver */
+	sm_writel(sm, EIM_MODE, 0UL);
+	sm_writel(sm, EIM_EDGE, 0UL);
+
 	sm->eim_chip = &eim_chip;
 
 	for (i = 0; i < nr_irqs; i++) {
-		set_irq_chip(sm->eim_first_irq + i, &eim_chip);
+		set_irq_chip_and_handler(sm->eim_first_irq + i, &eim_chip,
+					 handle_edge_irq);
 		set_irq_chip_data(sm->eim_first_irq + i, sm);
 	}