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pinctrl: intel: implement gpio_irq_enable

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There is unexpected gpio interrupt after irq_enable. If not
implemeted gpio_irq_enable callback, irq_enable calls irq_unmask
instead. But if there was interrupt set before the irq_enable,
unmask it may trigger the unexpected interrupt. By implementing
the gpio_irq_enable callback, do interrupt status ack, the issue
has gone.

Signed-off-by: Qi Zheng <qi.zheng@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Qipeng Zha <qipeng.zha@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Qi Zheng 2016-03-17 02:15:26 +08:00 committed by Linus Walleij
parent bf380cfa60
commit a939bb57cd
1 changed files with 30 additions and 0 deletions
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30
drivers/pinctrl/intel/pinctrl-intel.c
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@ -665,6 +665,35 @@ static void intel_gpio_irq_ack(struct irq_data *d)
spin_unlock(&pctrl->lock);
}
static void intel_gpio_irq_enable(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
const struct intel_community *community;
unsigned pin = irqd_to_hwirq(d);
unsigned long flags;
spin_lock_irqsave(&pctrl->lock, flags);
community = intel_get_community(pctrl, pin);
if (community) {
unsigned padno = pin_to_padno(community, pin);
unsigned gpp_size = community->gpp_size;
unsigned gpp_offset = padno % gpp_size;
unsigned gpp = padno / gpp_size;
u32 value;
/* Clear interrupt status first to avoid unexpected interrupt */
writel(BIT(gpp_offset), community->regs + GPI_IS + gpp * 4);
value = readl(community->regs + community->ie_offset + gpp * 4);
value |= BIT(gpp_offset);
writel(value, community->regs + community->ie_offset + gpp * 4);
}
spin_unlock_irqrestore(&pctrl->lock, flags);
}
static void intel_gpio_irq_mask_unmask(struct irq_data *d, bool mask)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@ -853,6 +882,7 @@ static irqreturn_t intel_gpio_irq(int irq, void *data)
static struct irq_chip intel_gpio_irqchip = {
.name = "intel-gpio",
.irq_enable = intel_gpio_irq_enable,
.irq_ack = intel_gpio_irq_ack,
.irq_mask = intel_gpio_irq_mask,
.irq_unmask = intel_gpio_irq_unmask,