On 07/06/16 16:12, Jon Hunter wrote: > For some devices the IRQ trigger type for a device is read from > firmware, such as device-tree. The IRQ trigger type is typically read > when the mapping for IRQ is created, which is before the IRQ is > requested. Hence, the IRQ trigger type is programmed when mapping the > IRQ and not when requesting the IRQ. > > Although this works for most cases, in order to support IRQ chips which > require runtime power management, which may not be accessible prior > to requesting the IRQ, it is desirable to look-up the IRQ trigger type > when it is requested. Therefore, if the IRQ trigger type is not > specified when __setup_irq() is called, look-up the saved IRQ trigger > type. This will allow us to defer the programming of the trigger type > from when the IRQ is mapped to when it is actually requested. > > Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> > Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx> > --- > kernel/irq/manage.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c > index ef0bc02c3a70..eaedeb74b49d 100644 > --- a/kernel/irq/manage.c > +++ b/kernel/irq/manage.c > @@ -1117,6 +1117,13 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) > new->irq = irq; > > /* > + * If the trigger type is not specified by the caller, > + * then use the default for this interrupt. > + */ > + if (!(new->flags & IRQF_TRIGGER_MASK)) > + new->flags |= irqd_get_trigger_type(&desc->irq_data); > + > + /* > * Check whether the interrupt nests into another interrupt > * thread. > */ > I've added the following patch to the queue, in order to deal with percpu interrupts that were not handled by this patch: diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index f8fd1fb..00cfc85 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1751,7 +1751,14 @@ void enable_percpu_irq(unsigned int irq, unsigned int type) if (!desc) return; + /* + * If the trigger type is not specified by the caller, then + * use the default for this interrupt. + */ type &= IRQ_TYPE_SENSE_MASK; + if (type == IRQ_TYPE_NONE) + type = irqd_get_trigger_type(&desc->irq_data); + if (type != IRQ_TYPE_NONE) { int ret; Thanks, M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html