From: Phil Reid preid@electromag.com.au
[ Upstream commit f759921cfbf4847319d197a6ed7c9534d593f8bc ]
When a threaded irq handler is chained attached to one of the gpio pins when configure for level irq the altera_gpio_irq_leveL_high_handler does not mask the interrupt while being handled by the chained irq. This resulting in the threaded irq not getting enough cycles to complete quickly enough before the irq was disabled as faulty. handle_level_irq should be used in this situation instead of handle_simple_irq.
In gpiochip_irqchip_add set default handler to handle_bad_irq as per Documentation/gpio/driver.txt. Then set the correct handler in the set_type callback.
Signed-off-by: Phil Reid preid@electromag.com.au Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin alexander.levin@verizon.com --- drivers/gpio/gpio-altera.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-)
diff --git a/drivers/gpio/gpio-altera.c b/drivers/gpio/gpio-altera.c index 3e6661bab54a..ddf9cd3ad974 100644 --- a/drivers/gpio/gpio-altera.c +++ b/drivers/gpio/gpio-altera.c @@ -94,21 +94,18 @@ static int altera_gpio_irq_set_type(struct irq_data *d,
altera_gc = to_altera(irq_data_get_irq_chip_data(d));
- if (type == IRQ_TYPE_NONE) + if (type == IRQ_TYPE_NONE) { + irq_set_handler_locked(d, handle_bad_irq); return 0; - if (type == IRQ_TYPE_LEVEL_HIGH && - altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH) - return 0; - if (type == IRQ_TYPE_EDGE_RISING && - altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_RISING) - return 0; - if (type == IRQ_TYPE_EDGE_FALLING && - altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_FALLING) - return 0; - if (type == IRQ_TYPE_EDGE_BOTH && - altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_BOTH) + } + if (type == altera_gc->interrupt_trigger) { + if (type == IRQ_TYPE_LEVEL_HIGH) + irq_set_handler_locked(d, handle_level_irq); + else + irq_set_handler_locked(d, handle_simple_irq); return 0; - + } + irq_set_handler_locked(d, handle_bad_irq); return -EINVAL; }
@@ -234,7 +231,6 @@ static void altera_gpio_irq_edge_handler(struct irq_desc *desc) chained_irq_exit(chip, desc); }
- static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc) { struct altera_gpio_chip *altera_gc; @@ -314,7 +310,7 @@ static int altera_gpio_probe(struct platform_device *pdev) altera_gc->interrupt_trigger = reg;
ret = gpiochip_irqchip_add(&altera_gc->mmchip.gc, &altera_irq_chip, 0, - handle_simple_irq, IRQ_TYPE_NONE); + handle_bad_irq, IRQ_TYPE_NONE);
if (ret) { dev_info(&pdev->dev, "could not add irqchip\n");