diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2014-03-13 19:03:54 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-03-14 13:43:33 +0100 |
| commit | e9df9e221665d40928e25a02c2700ac12eda7270 (patch) | |
| tree | 02f1f48fc7a236291837007cf97cc99835beb4ae | |
| parent | 649ff46e5e29868e915354ed1e9bebcf0faec3ae (diff) | |
| download | lwn-e9df9e221665d40928e25a02c2700ac12eda7270.tar.gz lwn-e9df9e221665d40928e25a02c2700ac12eda7270.zip | |
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>
| -rw-r--r-- | drivers/irqchip/irq-sun4i.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/irqchip/irq-sun4i.c b/drivers/irqchip/irq-sun4i.c index 60a28c69c65b..2029cc5e71c9 100644 --- a/drivers/irqchip/irq-sun4i.c +++ b/drivers/irqchip/irq-sun4i.c @@ -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) { - irq_set_chip_and_handler(virq, &sun4i_irq_chip, - handle_level_irq); + 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; |