A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 11:11:45 -04:00
Code Issues Projects Releases Packages Wiki Activity

pinctrl: exynos: ack level-triggered interrupts before unmasking

Browse source 
A level-triggered interrupt should be acked after the interrupt line
becomes inactive and before it is unmasked, or else another interrupt
will be immediately triggered.  Acking before or after calling the
handler is not enough.

Signed-off-by: Luigi Semenzato <[email protected]>
Signed-off-by: Doug Anderson <[email protected]>
Acked-by: Tomasz Figa <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Doug Anderson 2013-06-17 09:50:43 -07:00 • committed by Linus Walleij
commit 5a68e7a748
1 changed files with 22 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

22
drivers/pinctrl/pinctrl-exynos.c
View file

@ -84,6 +84,17 @@ static void exynos_gpio_irq_unmask(struct irq_data *irqd)
unsigned long mask;
unsigned long flags;
/*
* Ack level interrupts right before unmask
*
* If we don't do this we'll get a double-interrupt. Level triggered
* interrupts must not fire an interrupt if the level is not
* _currently_ active, even if it was active while the interrupt was
* masked.
*/
if (irqd_get_trigger_type(irqd) & IRQ_TYPE_LEVEL_MASK)
exynos_gpio_irq_ack(irqd);
spin_lock_irqsave(&bank->slock, flags);
mask = readl(d->virt_base + reg_mask);
@ -302,6 +313,17 @@ static void exynos_wkup_irq_unmask(struct irq_data *irqd)
unsigned long mask;
unsigned long flags;
/*
* Ack level interrupts right before unmask
*
* If we don't do this we'll get a double-interrupt. Level triggered
* interrupts must not fire an interrupt if the level is not
* _currently_ active, even if it was active while the interrupt was
* masked.
*/
if (irqd_get_trigger_type(irqd) & IRQ_TYPE_LEVEL_MASK)
exynos_wkup_irq_ack(irqd);
spin_lock_irqsave(&b->slock, flags);
mask = readl(d->virt_base + reg_mask);