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irqchip: orion: clear stale interrupts in irq_startup

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Bridge IRQ_CAUSE bits are asserted regardless of the corresponding bit in
IRQ_MASK register. To avoid interrupt events on stale irqs, we have to clear
them before unmask. This installs an .irq_startup callback to ensure stale
irqs are cleared before initial unmask.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Cc: <stable@vger.kernel.org>: f56c0738b5c2: "irqchip: orion: clear bridge cause register on init"
Cc: <stable@vger.kernel.org>: 38bd80b84fca: "irqchip: orion: use handle_edge_irq on bridge irqs"
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Sebastian Hesselbarth 2014-01-24 00:10:32 +01:00 committed by Jason Cooper
parent 5f40067fc8
commit e0318ec3bf
1 changed files with 14 additions and 0 deletions
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14
drivers/irqchip/irq-orion.c
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@ -123,6 +123,19 @@ static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc *desc)
}
}
/*
* Bridge IRQ_CAUSE is asserted regardless of IRQ_MASK register.
* To avoid interrupt events on stale irqs, we clear them before unmask.
*/
static unsigned int orion_bridge_irq_startup(struct irq_data *d)
{
struct irq_chip_type *ct = irq_data_get_chip_type(d);
ct->chip.irq_ack(d);
ct->chip.irq_unmask(d);
return 0;
}
static int __init orion_bridge_irq_init(struct device_node *np,
struct device_node *parent)
{
@ -176,6 +189,7 @@ static int __init orion_bridge_irq_init(struct device_node *np,
gc->chip_types[0].regs.ack = ORION_BRIDGE_IRQ_CAUSE;
gc->chip_types[0].regs.mask = ORION_BRIDGE_IRQ_MASK;
gc->chip_types[0].chip.irq_startup = orion_bridge_irq_startup;
gc->chip_types[0].chip.irq_ack = irq_gc_ack_clr_bit;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;