diff options
| author | Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | 2014-01-24 00:10:32 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-05 17:13:52 +0100 |
| commit | 6b32598699db3b8f60ed3d2ffa50b880c95e1fd5 (patch) | |
| tree | e0566f781e4be8154e73a6d4e246c3e04133a3bd | |
| parent | f702de8127e146a0d21be1bd532959c9ef9f4977 (diff) | |
irqchip: orion: clear stale interrupts in irq_startup
commit e0318ec3bf3f1502cd11b21b1eb00aa355b40b67 upstream.
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>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/irqchip/irq-orion.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-orion.c b/drivers/irqchip/irq-orion.c index 1f636f71906..0dfdc5c824a 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; |