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authorBarry Song <21cnbao@gmail.com>2014-01-03 11:34:46 +0800
committerOlof Johansson <olof@lixom.net>2014-01-08 22:02:14 -0800
commita87010ef3261912999302b3d82bd2e155898f816 (patch)
tree9784c968e983c1ec3ed0b1e605d05ecfa5fe3f66 /drivers/irqchip
parentb93a35b170f9ad599e852855224b74982de2bde1 (diff)
irqchip: sirf: set IRQ_LEVEL status_flags
SiRF internal interrupts are using level trigger. we need to tell the irq core this information. otherwise, we might get some problems as below 1. disable_irq(n) here irq core will mark the disabled flag but still keep the irq enabled due to involved lazy-disable 2. doing someting after disable_irq(n) in step 2, if one interrupt n comes, irq core will mark it as pending and mask the HW interrupt really. we name the coming interrupt as "X". 3. enable_irq(n) this will unmask the interrupt, so the level-trigger HW interrupt will come again, irq_handler will enter as "E1". after that, irq core will also check whether irq n is pending, if yes, and pending interrupt is not level-trigger, irq core will execute the pending irq_handler. so if we don't set the IRQ_LEVEL flag here, irq core will execute pending X again as "E2", but actually the pending interrupt has been handled by "E1". that makes a level-trigger HW interrupt is executed twice. here we fix the issue to avoid redundant interrupt overload. Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Huayi Li <Huayi.Li@csr.com> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-sirfsoc.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-sirfsoc.c b/drivers/irqchip/irq-sirfsoc.c
index 4851afae38dc..3a070c587ed9 100644
--- a/drivers/irqchip/irq-sirfsoc.c
+++ b/drivers/irqchip/irq-sirfsoc.c
@@ -34,9 +34,10 @@ sirfsoc_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
struct irq_chip_type *ct;
int ret;
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+ unsigned int set = IRQ_LEVEL;
ret = irq_alloc_domain_generic_chips(sirfsoc_irqdomain, num, 1, "irq_sirfsoc",
- handle_level_irq, clr, 0, IRQ_GC_INIT_MASK_CACHE);
+ handle_level_irq, clr, set, IRQ_GC_INIT_MASK_CACHE);
gc = irq_get_domain_generic_chip(sirfsoc_irqdomain, irq_start);
gc->reg_base = base;