The R-Car GPIO driver handles Runtime PM for requested GPIOs only.
When using a GPIO purely as an interrupt source, no Runtime PM handling
is done, and the GPIO module's clock may not be enabled.
To fix this:
- Add .irq_request_resources() and .irq_release_resources() callbacks
to handle Runtime PM when an interrupt is requested,
- Runtime-resume the device before writing to the GPIO module's
registers for disabling/enabling an interrupt, or for configuring
the interrupt type,
- Add checks to warn when the GPIO module's registers are accessed
while the device is runtime-suspended.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
This fixes ravb Ethernet on r8a7795/Salvator-X, which was "broken" by
commit d5c3d84657db57bd ("net: phy: Avoid polling PHY with
PHY_IGNORE_INTERRUPTS").
Does it also fix the HDMI interrupt on r8a7791/Koelsch?
Notes:
1. I assume gpio_rcar_irq_{dis,en}able() may be called from contexts
where pm_runtime_get_sync() may not be called.
However, so far I didn't see any reports from the might_sleep_if()
check in __pm_runtime_resume(),
2. gpio_rcar_irq_disable() is called from the IRQ core before
gpio_rcar_irq_set_type().
Else an alternative solution could be to just runtime-resume the
device from gpio_rcar_irq_set_type() when an interrupt is setup,
and never call pm_runtime_put() again. That would cause issues when
compiling gpio-rcar as a module, though.
---
drivers/gpio/gpio-rcar.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index cf41440aff91971e..63b679b3af5d6d16 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -59,12 +59,18 @@ struct gpio_rcar_priv {
static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
{
+ WARN(pm_runtime_suspended(&p->pdev->dev),
+ "%s: %s is runtime-suspended\n", __func__,
+ dev_name(&p->pdev->dev));
return ioread32(p->base + offs);
}
static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
u32 value)
{
+ WARN(pm_runtime_suspended(&p->pdev->dev),
+ "%s: %s is runtime-suspended\n", __func__,
+ dev_name(&p->pdev->dev));
iowrite32(value, p->base + offs);
}
@@ -86,7 +92,11 @@ static void gpio_rcar_irq_disable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct gpio_rcar_priv *p = gpiochip_get_data(gc);
+ if (pm_runtime_get_sync(&p->pdev->dev) < 0)
+ return;
+
gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
+ pm_runtime_put(&p->pdev->dev);
}
static void gpio_rcar_irq_enable(struct irq_data *d)
@@ -94,7 +104,11 @@ static void gpio_rcar_irq_enable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct gpio_rcar_priv *p = gpiochip_get_data(gc);
+ if (pm_runtime_get_sync(&p->pdev->dev) < 0)
+ return;
+
gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
+ pm_runtime_put(&p->pdev->dev);
}
static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
@@ -105,6 +119,9 @@ static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
{
unsigned long flags;
+ if (pm_runtime_get_sync(&p->pdev->dev) < 0)
+ return;
+
/* follow steps in the GPIO documentation for
* "Setting Edge-Sensitive Interrupt Input Mode" and
* "Setting Level-Sensitive Interrupt Input Mode"
@@ -130,6 +147,8 @@ static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
gpio_rcar_write(p, INTCLR, BIT(hwirq));
spin_unlock_irqrestore(&p->lock, flags);
+
+ pm_runtime_put(&p->pdev->dev);
}
static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
@@ -196,6 +215,27 @@ static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on)
return 0;
}
+static int gpio_rcar_irq_request_resources(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct gpio_rcar_priv *p = gpiochip_get_data(gc);
+ int error;
+
+ error = pm_runtime_get_sync(&p->pdev->dev);
+ if (error < 0)
+ return error;
+
+ return 0;
+}
+
+static void gpio_rcar_irq_release_resources(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct gpio_rcar_priv *p = gpiochip_get_data(gc);
+
+ pm_runtime_put(&p->pdev->dev);
+}
+
static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
{
struct gpio_rcar_priv *p = dev_id;
@@ -450,6 +490,8 @@ static int gpio_rcar_probe(struct platform_device *pdev)
irq_chip->irq_unmask = gpio_rcar_irq_enable;
irq_chip->irq_set_type = gpio_rcar_irq_set_type;
irq_chip->irq_set_wake = gpio_rcar_irq_set_wake;
+ irq_chip->irq_request_resources = gpio_rcar_irq_request_resources;
+ irq_chip->irq_release_resources = gpio_rcar_irq_release_resources;
irq_chip->flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND;
ret = gpiochip_add_data(gpio_chip, p);
--
1.9.1
