irqchip: intc-irqpin: Add force comments

Add comments to describe the special case for
"force" versions of enable and disable functions.

Signed-off-by: Magnus Damm <damm@opensource.se>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/irqchip/irq-renesas-intc-irqpin.c b/drivers/irqchip/irq-renesas-intc-irqpin.c
index 0ac2bf6..59c0cbc 100644 (file)
--- a/drivers/irqchip/irq-renesas-intc-irqpin.c
+++ b/drivers/irqchip/irq-renesas-intc-irqpin.c
@@ -199,6 +199,11 @@ static void intc_irqpin_irq_enable_force(struct irq_data *d)
        int irq = p->irq[irqd_to_hwirq(d)].requested_irq;
 
        intc_irqpin_irq_enable(d);
+
+       /* enable interrupt through parent interrupt controller,
+        * assumes non-shared interrupt with 1:1 mapping
+        * needed for busted IRQs on some SoCs like sh73a0
+        */
        irq_get_chip(irq)->irq_unmask(irq_get_irq_data(irq));
 }
 
@@ -207,6 +212,10 @@ static void intc_irqpin_irq_disable_force(struct irq_data *d)
        struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
        int irq = p->irq[irqd_to_hwirq(d)].requested_irq;
 
+       /* disable interrupt through parent interrupt controller,
+        * assumes non-shared interrupt with 1:1 mapping
+        * needed for busted IRQs on some SoCs like sh73a0
+        */
        irq_get_chip(irq)->irq_mask(irq_get_irq_data(irq));
        intc_irqpin_irq_disable(d);
 }