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gpio: mxc: release the parent IRQ in runtime suspend

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Release the parent interrupt request during runtime suspend, allowing
the parent interrupt controller to enter runtime suspend if there are
no active users.

This change may not have a visible impact if the parent controller is
the GIC, but it can enable significant power savings for parent IRQ
controllers like IRQSteer inside a subsystem on i.MX8 SoCs. Releasing
the parent IRQ provides an opportunity for the subsystem to enter suspend
states if there are no active users.

Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Shenwei Wang 2023-08-09 09:13:24 -05:00 committed by Bartosz Golaszewski
parent b7df0f340b
commit 5f6d1998ad
1 changed files with 29 additions and 12 deletions
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41
drivers/gpio/gpio-mxc.c
View file

@ -62,6 +62,7 @@ struct mxc_gpio_port {
struct clk *clk;
int irq;
int irq_high;
void (*mx_irq_handler)(struct irq_desc *desc);
struct irq_domain *domain;
struct gpio_chip gc;
struct device *dev;
@ -399,6 +400,24 @@ static void mxc_gpio_free(struct gpio_chip *chip, unsigned int offset)
pm_runtime_put(chip->parent);
}
static void mxc_update_irq_chained_handler(struct mxc_gpio_port *port, bool enable)
{
if (enable)
irq_set_chained_handler_and_data(port->irq, port->mx_irq_handler, port);
else
irq_set_chained_handler_and_data(port->irq, NULL, NULL);
/* setup handler for GPIO 16 to 31 */
if (port->irq_high > 0) {
if (enable)
irq_set_chained_handler_and_data(port->irq_high,
port->mx_irq_handler,
port);
else
irq_set_chained_handler_and_data(port->irq_high, NULL, NULL);
}
}
static int mxc_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@ -460,18 +479,12 @@ static int mxc_gpio_probe(struct platform_device *pdev)
* the handler is needed only once, but doing it for every port
* is more robust and easier.
*/
irq_set_chained_handler(port->irq, mx2_gpio_irq_handler);
} else {
/* setup one handler for each entry */
irq_set_chained_handler_and_data(port->irq,
mx3_gpio_irq_handler, port);
if (port->irq_high > 0)
/* setup handler for GPIO 16 to 31 */
irq_set_chained_handler_and_data(port->irq_high,
mx3_gpio_irq_handler,
port);
}
port->irq_high = -1;
port->mx_irq_handler = mx2_gpio_irq_handler;
} else
port->mx_irq_handler = mx3_gpio_irq_handler;
mxc_update_irq_chained_handler(port, true);
err = bgpio_init(&port->gc, &pdev->dev, 4,
port->base + GPIO_PSR,
port->base + GPIO_DR, NULL,
@ -604,6 +617,7 @@ static int mxc_gpio_runtime_suspend(struct device *dev)
mxc_gpio_save_regs(port);
clk_disable_unprepare(port->clk);
mxc_update_irq_chained_handler(port, false);
return 0;
}
@ -613,9 +627,12 @@ static int mxc_gpio_runtime_resume(struct device *dev)
struct mxc_gpio_port *port = dev_get_drvdata(dev);
int ret;
mxc_update_irq_chained_handler(port, true);
ret = clk_prepare_enable(port->clk);
if (ret)
if (ret) {
mxc_update_irq_chained_handler(port, false);
return ret;
}
mxc_gpio_restore_regs(port);