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SubjectRe: [PATCH] gpio: Wakeup gpio controller when it is used as IRQ controller
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On 09/20/2017 02:14 AM, Michal Simek wrote:
> From: Borsodi Petr <Petr.Borsodi@i.cz>
>
> There is a problem with GPIO driver when used as IRQ controller.
> It is not working because the module is sleeping (clock is disabled).
> The patch enables clocks when IP is used as IRQ controller.

I think, it should be solved already in genirq core.
commit be45beb "genirq: Add runtime power management support for IRQ chips"


>
> Signed-off-by: Borsodi Petr <Petr.Borsodi@i.cz>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> ---
>
> Based on discussion with Linus here https://lkml.org/lkml/2017/8/22/400
> ---
> drivers/gpio/gpiolib.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index eb80dac4e26a..17258ad1fadb 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1676,14 +1676,22 @@ static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
> static int gpiochip_irq_reqres(struct irq_data *d)
> {
> struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
> + int ret;
>
> if (!try_module_get(chip->gpiodev->owner))
> return -ENODEV;
>
> + ret = pm_runtime_get_sync(chip->parent);
> + if (ret < 0) {
> + module_put(chip->gpiodev->owner);
> + return ret;
> + }
> +
> if (gpiochip_lock_as_irq(chip, d->hwirq)) {
> chip_err(chip,
> "unable to lock HW IRQ %lu for IRQ\n",
> d->hwirq);
> + pm_runtime_put(chip->parent);
> module_put(chip->gpiodev->owner);
> return -EINVAL;
> }
> @@ -1695,6 +1703,7 @@ static void gpiochip_irq_relres(struct irq_data *d)
> struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
>
> gpiochip_unlock_as_irq(chip, d->hwirq);
> + pm_runtime_put(chip->parent);
> module_put(chip->gpiodev->owner);
> }
>
>

--
regards,
-grygorii

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