[B/C] [PATCH 2/4] pinctrl: intel: Do pin translation when lock IRQ

[Kai-Heng Feng]

From: Andy Shevchenko <andriy.shevchenko at linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1811777

Default GPIOLIB callbacks for request and release IRQ do not do a GPIO
to pin translation which is necessary for Intel hardware, such as Intel
Cannonlake. Absence of the translation prevents some pins to be locked
as IRQ due to direction check. Introduce own callbacks to make
translation possible to avoid above issue.

Fixes: a60eac3239f0 ("pinctrl: intel: Allow custom GPIO base for pad groups")
Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg at linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
(cherry picked from commit 55aedef50d4d810670916d9fce4a40d5da2079e7)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c | 30 +++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 4be827f136d1..3c3a41109a41 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -870,6 +870,34 @@ static int intel_gpio_to_pin(struct intel_pinctrl *pctrl, unsigned offset,
 	return -EINVAL;
 }
 
+static int intel_gpio_irq_reqres(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
+	int pin;
+
+	pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
+	if (pin >= 0) {
+		if (gpiochip_lock_as_irq(gc, pin)) {
+			dev_err(pctrl->dev, "unable to lock HW IRQ %d for IRQ\n",
+				pin);
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+static void intel_gpio_irq_relres(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct intel_pinctrl *pctrl = gpiochip_get_data(gc);
+	int pin;
+
+	pin = intel_gpio_to_pin(pctrl, irqd_to_hwirq(d), NULL, NULL);
+	if (pin >= 0)
+		gpiochip_unlock_as_irq(gc, pin);
+}
+
 static void intel_gpio_irq_ack(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -1083,6 +1111,8 @@ static irqreturn_t intel_gpio_irq(int irq, void *data)
 
 static struct irq_chip intel_gpio_irqchip = {
 	.name = "intel-gpio",
+	.irq_request_resources = intel_gpio_irq_reqres,
+	.irq_release_resources = intel_gpio_irq_relres,
 	.irq_enable = intel_gpio_irq_enable,
 	.irq_ack = intel_gpio_irq_ack,
 	.irq_mask = intel_gpio_irq_mask,
-- 
2.17.1