Commit e9df9e22 authored Mar 13, 2014 by Hans de Goede Committed by Thomas Gleixner Mar 14, 2014

irqchip: sun4i: Don't ack IRQs > 0, fix acking of IRQ 0



All IRQs except for IRQ 0 seem to not need acking, so drop acking for them.

The ENMI needs to have the ack done *after* clearing the interrupt source,
otherwise we will get a spurious interrupt for each real interrupt.

So use the new IRQCHIP_EOI_THREADED flag for this in combination with
handle_fasteoi_irq. This uses a separate irq_chip struct for IRQ 0,
since we only want this behavior for IRQ 0.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-sunxi@googlegroups.com
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: http://lkml.kernel.org/r/1394733834-26839-5-git-send-email-hdegoede@redhat.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 649ff46e

drivers/irqchip/irq-sun4i.c

+16 −3

Original line number	Diff line number	Diff line
		@@ -76,16 +76,29 @@ static void sun4i_irq_unmask(struct irq_data *irqd)

		static struct irq_chip sun4i_irq_chip = {
		.name = "sun4i_irq",
		.irq_ack = sun4i_irq_ack,
		.irq_mask = sun4i_irq_mask,
		.irq_unmask = sun4i_irq_unmask,
		};

		/* IRQ 0 / the ENMI needs a late eoi call */
		static struct irq_chip sun4i_irq_chip_enmi = {
		.name = "sun4i_irq",
		.irq_eoi = sun4i_irq_ack,
		.irq_mask = sun4i_irq_mask,
		.irq_unmask = sun4i_irq_unmask,
		.flags = IRQCHIP_EOI_THREADED \| IRQCHIP_EOI_IF_HANDLED,
		};

		static int sun4i_irq_map(struct irq_domain *d, unsigned int virq,
		irq_hw_number_t hw)
		{
		if (hw == 0)
		irq_set_chip_and_handler(virq, &sun4i_irq_chip_enmi,
		handle_fasteoi_irq);
		else
		irq_set_chip_and_handler(virq, &sun4i_irq_chip,
		handle_level_irq);

		set_irq_flags(virq, IRQF_VALID \| IRQF_PROBE);

		return 0;