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authorGeert Uytterhoeven <geert+renesas@glider.be>2015-06-25 17:45:57 +0300
committerLinus Walleij <linus.walleij@linaro.org>2015-07-16 11:42:44 +0300
commit65194cb174b873448b208eb6e04ecb72237af76e (patch)
treecbc46ca87d5751390d89618f328e4ac9a9bfc919 /drivers/gpio/gpio-rcar.c
parent527b397a7a3647b8ba2eae2e7a12b237bf411476 (diff)
downloadlinux-65194cb174b873448b208eb6e04ecb72237af76e.tar.xz
gpio: rcar: Fine-grained Runtime PM support
Currently gpio modules are runtime-resumed at probe time. This means the gpio module will be active all the time (except during system suspend, if not configured as a wake-up source). While an R-Car Gen2 gpio module retains pins configured for output at the requested level while put in standby mode, gpio registercannot be accessed while suspended. Unfortunately pm_runtime_get_sync() cannot be called from all contexts where gpio register access is needed. Hence move the Runtime PM handling from probe/remove time to gpio request/free time, which is probably the best we can do. On r8a7791/koelsch, gpio modules 0, 1, 3, and 4 are now suspended during normal use (gpio2 is used for LEDs and regulators, gpio5 for keys, gpio6 for SD-Card CD & WP, gpio7 for keys and regulators). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-rcar.c')
-rw-r--r--drivers/gpio/gpio-rcar.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 1e14a6c74ed1..4fc13ce9c60a 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -251,17 +251,32 @@ static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
{
- return pinctrl_request_gpio(chip->base + offset);
+ struct gpio_rcar_priv *p = gpio_to_priv(chip);
+ int error;
+
+ error = pm_runtime_get_sync(&p->pdev->dev);
+ if (error < 0)
+ return error;
+
+ error = pinctrl_request_gpio(chip->base + offset);
+ if (error)
+ pm_runtime_put(&p->pdev->dev);
+
+ return error;
}
static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
{
+ struct gpio_rcar_priv *p = gpio_to_priv(chip);
+
pinctrl_free_gpio(chip->base + offset);
/* Set the GPIO as an input to ensure that the next GPIO request won't
* drive the GPIO pin as an output.
*/
gpio_rcar_config_general_input_output_mode(chip, offset, false);
+
+ pm_runtime_put(&p->pdev->dev);
}
static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
@@ -405,7 +420,6 @@ static int gpio_rcar_probe(struct platform_device *pdev)
}
pm_runtime_enable(dev);
- pm_runtime_get_sync(dev);
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -487,7 +501,6 @@ static int gpio_rcar_probe(struct platform_device *pdev)
err1:
gpiochip_remove(gpio_chip);
err0:
- pm_runtime_put(dev);
pm_runtime_disable(dev);
return ret;
}
@@ -498,7 +511,6 @@ static int gpio_rcar_remove(struct platform_device *pdev)
gpiochip_remove(&p->gpio_chip);
- pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}