pinctrl: intel: Configure GPIO chip IRQ as wakeup interrupts

On some Intel BXT platform, wake-up from suspend-to-idle on pressing
power-button is not working. Its noticed that gpio-keys driver marking the
second level IRQ/power-button as wake capable but Intel pintctrl
driver is missing to mark GPIO chip/controller IRQ which first level IRQ
as wake cable if its GPIO pin IRQ is wakeble. So, though the first level
IRQ gets generated on power-button press, since it is not marked as
wake capable resume/wake-up flow is not happening.
Intel pintctrl/GPIO driver need to mark GPIO chip/controller IRQ (first
level IRQ) as wake capable iff GPIO pin's IRQ (second level IRQ) is marked
as wake cable.

Changes in v2:
 - Add missing irq initialisation.

Signed-off-by: Nilesh Bacchewar <nilesh.bacchewar@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 257cab12969257d44c2e8bad1993575034e82aa8..63387a40b973a417d6dd00ec9fe952413465b159 100644 (file)
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -86,6 +86,7 @@ struct intel_pinctrl_context {
  * @communities: All communities in this pin controller
  * @ncommunities: Number of communities in this pin controller
  * @context: Configuration saved over system sleep
+ * @irq: pinctrl/GPIO chip irq number
  */
 struct intel_pinctrl {
        struct device *dev;
@@ -97,6 +98,7 @@ struct intel_pinctrl {
        struct intel_community *communities;
        size_t ncommunities;
        struct intel_pinctrl_context context;
+       int irq;
 };
 
 #define pin_to_padno(c, p)     ((p) - (c)->pin_base)
@@ -793,38 +795,12 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
 {
        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 padno, gpp, gpp_offset;
-       unsigned long flags;
-       u32 gpe_en;
-
-       community = intel_get_community(pctrl, pin);
-       if (!community)
-               return -EINVAL;
-
-       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
-       padno = pin_to_padno(community, pin);
-       gpp = padno / community->gpp_size;
-       gpp_offset = padno % community->gpp_size;
-
-       /* Clear the existing wake status */
-       writel(BIT(gpp_offset), community->regs + GPI_GPE_STS + gpp * 4);
-
-       /*
-        * The controller will generate wake when GPE of the corresponding
-        * pad is enabled and it is not routed to SCI (GPIROUTSCI is not
-        * set).
-        */
-       gpe_en = readl(community->regs + GPI_GPE_EN + gpp * 4);
        if (on)
-               gpe_en |= BIT(gpp_offset);
+               enable_irq_wake(pctrl->irq);
        else
-               gpe_en &= ~BIT(gpp_offset);
-       writel(gpe_en, community->regs + GPI_GPE_EN + gpp * 4);
-
-       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+               disable_irq_wake(pctrl->irq);
 
        dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin);
        return 0;
@@ -905,6 +881,7 @@ static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
        pctrl->chip.label = dev_name(pctrl->dev);
        pctrl->chip.parent = pctrl->dev;
        pctrl->chip.base = -1;
+       pctrl->irq = irq;
 
        ret = gpiochip_add_data(&pctrl->chip, pctrl);
        if (ret) {