From mboxrd@z Thu Jan 1 00:00:00 1970 From: sebastian.hesselbarth@gmail.com (Sebastian Hesselbarth) Date: Fri, 24 Jan 2014 00:10:32 +0100 Subject: [PATCH v2 3/3] irqchip: orion: clear stale interrupts in irq_startup In-Reply-To: <1390516686-2224-4-git-send-email-sebastian.hesselbarth@gmail.com> References: <1390516686-2224-4-git-send-email-sebastian.hesselbarth@gmail.com> Message-ID: <1390518632-2576-1-git-send-email-sebastian.hesselbarth@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- Changelog: v1->v2: - use .irq_startup instead of .irq_enable (Reported by Jason Gunthorpe) Cc: Thomas Gleixner Cc: Jason Cooper Cc: Andrew Lunn Cc: Gregory Clement Cc: Jason Gunthorpe Cc: Ezequiel Garcia Cc: linux-arm-kernel at lists.infradead.org Cc: linux-kernel at vger.kernel.org --- drivers/irqchip/irq-orion.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/irqchip/irq-orion.c b/drivers/irqchip/irq-orion.c index 1f636f719065..0dfdc5c824a1 100644 --- a/drivers/irqchip/irq-orion.c +++ b/drivers/irqchip/irq-orion.c @@ -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; -- 1.8.5.2