diff options
author | Geert Uytterhoeven <geert+renesas@glider.be> | 2015-03-18 19:41:09 +0100 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2015-03-26 10:25:32 +0100 |
commit | ab82fa7da4dce5c728730d7aa0e11a2cbc9266da (patch) | |
tree | 9dbd5bda183455a012a4dba19a507cc5c3c14767 /drivers/gpio | |
parent | 3dc1e6852115b3163e7dacc76bbcb78ccff29421 (diff) | |
download | talos-obmc-linux-ab82fa7da4dce5c728730d7aa0e11a2cbc9266da.tar.gz talos-obmc-linux-ab82fa7da4dce5c728730d7aa0e11a2cbc9266da.zip |
gpio: rcar: Prevent module clock disable when wake-up is enabled
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 <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r-- | drivers/gpio/gpio-rcar.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index d96166ca1b42..fd3977465948 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"); |