diff options
Diffstat (limited to 'drivers/gpio/gpio-nomadik.c')
| -rw-r--r-- | drivers/gpio/gpio-nomadik.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c index 1cdfd9894a9..86b6841ac4f 100644 --- a/drivers/gpio/gpio-nomadik.c +++ b/drivers/gpio/gpio-nomadik.c @@ -175,6 +175,36 @@ 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) { @@ -241,6 +271,15 @@ static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset, } /* + * 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. */ |