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gpio/nomadik: fix spurious interrupts with SKE 

If the pin is switching to altfunc, and there was an interrupt
installed on it which has been lazy disabled, actually mask the
interrupt to prevent spurious interrupts that would occur while
the pin is under control of the peripheral. Only SKE does this.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Rabin Vincent 2011-05-23 12:22:18 +05:30 committed by Linus Walleij
parent 6c12fe888a
commit 6c42ad1cf4
1 changed files with 39 additions and 0 deletions
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39
drivers/gpio/gpio-nomadik.c
View File

@ -174,6 +174,36 @@ static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
}
}
static void
nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
{
u32 falling = nmk_chip->fimsc & BIT(offset);
u32 rising = nmk_chip->rimsc & BIT(offset);
int gpio = nmk_chip->chip.base + offset;
int irq = NOMADIK_GPIO_TO_IRQ(gpio);
struct irq_data *d = irq_get_irq_data(irq);
if (!rising && !falling)
return;
if (!d || !irqd_irq_disabled(d))
return;
if (rising) {
nmk_chip->rimsc &= ~BIT(offset);
writel_relaxed(nmk_chip->rimsc,
nmk_chip->addr + NMK_GPIO_RIMSC);
}
if (falling) {
nmk_chip->fimsc &= ~BIT(offset);
writel_relaxed(nmk_chip->fimsc,
nmk_chip->addr + NMK_GPIO_FIMSC);
}
dev_dbg(nmk_chip->chip.dev, "%d: clearing interrupt mask\n", gpio);
}
static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
pin_cfg_t cfg, bool sleep, unsigned int *slpmregs)
{
@ -239,6 +269,15 @@ static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
__nmk_gpio_set_pull(nmk_chip, offset, pull);
}
/*
* If the pin is switching to altfunc, and there was an interrupt
* installed on it which has been lazy disabled, actually mask the
* interrupt to prevent spurious interrupts that would occur while the
* pin is under control of the peripheral. Only SKE does this.
*/
if (af != NMK_GPIO_ALT_GPIO)
nmk_gpio_disable_lazy_irq(nmk_chip, offset);
/*
* If we've backed up the SLPM registers (glitch workaround), modify
* the backups since they will be restored.