When the GPIO module is needed for wake-up, it's module clock must not be disabled. Hence implement irq_chip.irq_set_wake(), which increments/decrements the clock's enable_count when needed, and forwards the wake-up state to the upstream interrupt controller.
This fixes wake-up from s2ram using gpio-keys when using a PM Domain to manage the module clock. Signed-off-by: Geert Uytterhoeven <[email protected]> --- To avoid ugly warning messages during resume, this depends on the GIC driver setting "gic_chip.flags = IRQCHIP_SKIP_SET_WAKE". (cfr. http://marc.info/?l=linux-sh&m=142669263324586&w=2). --- drivers/gpio/gpio-rcar.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index d96166ca1b42f93e..fd39774659484fa6 100644 --- a/drivers/gpio/gpio-rcar.c +++ b/drivers/gpio/gpio-rcar.c @@ -14,6 +14,7 @@ * GNU General Public License for more details. */ +#include <linux/clk.h> #include <linux/err.h> #include <linux/gpio.h> #include <linux/init.h> @@ -37,6 +38,8 @@ struct gpio_rcar_priv { struct platform_device *pdev; struct gpio_chip gpio_chip; struct irq_chip irq_chip; + unsigned int irq_parent; + struct clk *clk; }; #define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */ @@ -169,6 +172,25 @@ static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type) return 0; } +static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv, + gpio_chip); + + irq_set_irq_wake(p->irq_parent, on); + + if (!p->clk) + return 0; + + if (on) + clk_enable(p->clk); + else + clk_disable(p->clk); + + return 0; +} + static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id) { struct gpio_rcar_priv *p = dev_id; @@ -367,6 +389,12 @@ static int gpio_rcar_probe(struct platform_device *pdev) platform_set_drvdata(pdev, p); + p->clk = devm_clk_get(dev, NULL); + if (IS_ERR(p->clk)) { + dev_warn(dev, "unable to get clock\n"); + p->clk = NULL; + } + pm_runtime_enable(dev); pm_runtime_get_sync(dev); @@ -404,8 +432,8 @@ static int gpio_rcar_probe(struct platform_device *pdev) irq_chip->irq_mask = gpio_rcar_irq_disable; irq_chip->irq_unmask = gpio_rcar_irq_enable; irq_chip->irq_set_type = gpio_rcar_irq_set_type; - irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_SET_TYPE_MASKED - | IRQCHIP_MASK_ON_SUSPEND; + irq_chip->irq_set_wake = gpio_rcar_irq_set_wake; + irq_chip->flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND; ret = gpiochip_add(gpio_chip); if (ret) { @@ -420,6 +448,7 @@ static int gpio_rcar_probe(struct platform_device *pdev) goto err1; } + p->irq_parent = irq->start; if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler, IRQF_SHARED, name, p)) { dev_err(dev, "failed to request IRQ\n"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
