[v2,1/4] gpio: dln2: fix issue when an IRQ is unmasked then enabled
diff mbox

Message ID 1418745435-2851-2-git-send-email-octavian.purdila@intel.com
State Accepted
Headers show

Commit Message

Octavian Purdila Dec. 16, 2014, 3:57 p.m. UTC
As noticed during suspend/resume operations, the IRQ can be unmasked
then disabled in suspend and eventually enabled in resume, but without
being unmasked.

The current implementation does not take into account interactions
between mask/unmask and enable/disable interrupts, and thus in the
above scenarios the IRQs remain unactive.

To fix this we removed the enable/disable operations as they fallback
to mask/unmask anyway.

We also remove the pending bitmaks as it is already done in irq_data
(i.e. IRQS_PENDING).

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
---
 drivers/gpio/gpio-dln2.c | 53 +++++++-----------------------------------------
 1 file changed, 7 insertions(+), 46 deletions(-)

Comments

Alexandre Courbot Dec. 17, 2014, 7:51 a.m. UTC | #1
On Wed, Dec 17, 2014 at 12:57 AM, Octavian Purdila
<octavian.purdila@intel.com> wrote:
> As noticed during suspend/resume operations, the IRQ can be unmasked
> then disabled in suspend and eventually enabled in resume, but without
> being unmasked.
>
> The current implementation does not take into account interactions
> between mask/unmask and enable/disable interrupts, and thus in the
> above scenarios the IRQs remain unactive.
>
> To fix this we removed the enable/disable operations as they fallback
> to mask/unmask anyway.
>
> We also remove the pending bitmaks as it is already done in irq_data
> (i.e. IRQS_PENDING).
>
> Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
> ---
>  drivers/gpio/gpio-dln2.c | 53 +++++++-----------------------------------------
>  1 file changed, 7 insertions(+), 46 deletions(-)

Yum, less code!

Acked-by: Alexandre Courbot <acourbot@nvidia.com>
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Linus Walleij Jan. 7, 2015, 9:38 a.m. UTC | #2
On Tue, Dec 16, 2014 at 4:57 PM, Octavian Purdila
<octavian.purdila@intel.com> wrote:

> As noticed during suspend/resume operations, the IRQ can be unmasked
> then disabled in suspend and eventually enabled in resume, but without
> being unmasked.
>
> The current implementation does not take into account interactions
> between mask/unmask and enable/disable interrupts, and thus in the
> above scenarios the IRQs remain unactive.
>
> To fix this we removed the enable/disable operations as they fallback
> to mask/unmask anyway.
>
> We also remove the pending bitmaks as it is already done in irq_data
> (i.e. IRQS_PENDING).
>
> Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>

This patch applied for fixes.

Yours,
Linus Walleij
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Patch
diff mbox

diff --git a/drivers/gpio/gpio-dln2.c b/drivers/gpio/gpio-dln2.c
index 978b51e..28a62c4 100644
--- a/drivers/gpio/gpio-dln2.c
+++ b/drivers/gpio/gpio-dln2.c
@@ -64,9 +64,8 @@  struct dln2_gpio {
 	 */
 	DECLARE_BITMAP(output_enabled, DLN2_GPIO_MAX_PINS);
 
-	DECLARE_BITMAP(irqs_masked, DLN2_GPIO_MAX_PINS);
-	DECLARE_BITMAP(irqs_enabled, DLN2_GPIO_MAX_PINS);
-	DECLARE_BITMAP(irqs_pending, DLN2_GPIO_MAX_PINS);
+	/* active IRQs - not synced to hardware */
+	DECLARE_BITMAP(unmasked_irqs, DLN2_GPIO_MAX_PINS);
 	struct dln2_irq_work *irq_work;
 };
 
@@ -303,29 +302,19 @@  static void dln2_irq_work(struct work_struct *w)
 	struct dln2_gpio *dln2 = iw->dln2;
 	u8 type = iw->type & DLN2_GPIO_EVENT_MASK;
 
-	if (test_bit(iw->pin, dln2->irqs_enabled))
+	if (test_bit(iw->pin, dln2->unmasked_irqs))
 		dln2_gpio_set_event_cfg(dln2, iw->pin, type, 0);
 	else
 		dln2_gpio_set_event_cfg(dln2, iw->pin, DLN2_GPIO_EVENT_NONE, 0);
 }
 
-static void dln2_irq_enable(struct irq_data *irqd)
-{
-	struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
-	struct dln2_gpio *dln2 = container_of(gc, struct dln2_gpio, gpio);
-	int pin = irqd_to_hwirq(irqd);
-
-	set_bit(pin, dln2->irqs_enabled);
-	schedule_work(&dln2->irq_work[pin].work);
-}
-
-static void dln2_irq_disable(struct irq_data *irqd)
+static void dln2_irq_unmask(struct irq_data *irqd)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
 	struct dln2_gpio *dln2 = container_of(gc, struct dln2_gpio, gpio);
 	int pin = irqd_to_hwirq(irqd);
 
-	clear_bit(pin, dln2->irqs_enabled);
+	set_bit(pin, dln2->unmasked_irqs);
 	schedule_work(&dln2->irq_work[pin].work);
 }
 
@@ -335,27 +324,8 @@  static void dln2_irq_mask(struct irq_data *irqd)
 	struct dln2_gpio *dln2 = container_of(gc, struct dln2_gpio, gpio);
 	int pin = irqd_to_hwirq(irqd);
 
-	set_bit(pin, dln2->irqs_masked);
-}
-
-static void dln2_irq_unmask(struct irq_data *irqd)
-{
-	struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
-	struct dln2_gpio *dln2 = container_of(gc, struct dln2_gpio, gpio);
-	struct device *dev = dln2->gpio.dev;
-	int pin = irqd_to_hwirq(irqd);
-
-	if (test_and_clear_bit(pin, dln2->irqs_pending)) {
-		int irq;
-
-		irq = irq_find_mapping(dln2->gpio.irqdomain, pin);
-		if (!irq) {
-			dev_err(dev, "pin %d not mapped to IRQ\n", pin);
-			return;
-		}
-
-		generic_handle_irq(irq);
-	}
+	clear_bit(pin, dln2->unmasked_irqs);
+	schedule_work(&dln2->irq_work[pin].work);
 }
 
 static int dln2_irq_set_type(struct irq_data *irqd, unsigned type)
@@ -389,8 +359,6 @@  static int dln2_irq_set_type(struct irq_data *irqd, unsigned type)
 
 static struct irq_chip dln2_gpio_irqchip = {
 	.name = "dln2-irq",
-	.irq_enable = dln2_irq_enable,
-	.irq_disable = dln2_irq_disable,
 	.irq_mask = dln2_irq_mask,
 	.irq_unmask = dln2_irq_unmask,
 	.irq_set_type = dln2_irq_set_type,
@@ -425,13 +393,6 @@  static void dln2_gpio_event(struct platform_device *pdev, u16 echo,
 		return;
 	}
 
-	if (!test_bit(pin, dln2->irqs_enabled))
-		return;
-	if (test_bit(pin, dln2->irqs_masked)) {
-		set_bit(pin, dln2->irqs_pending);
-		return;
-	}
-
 	switch (dln2->irq_work[pin].type) {
 	case DLN2_GPIO_EVENT_CHANGE_RISING:
 		if (event->value)