diff options
| author | Doug Berger <opendmb@gmail.com> | 2017-10-24 12:54:48 -0700 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-10-31 10:29:53 +0100 |
| commit | 2c218b9f1bcc30969195d472e7d29f59e4e2ced6 (patch) | |
| tree | 3d0819672d1eac3fb7edde4658c0e98a45f99c77 /drivers/gpio/gpio-brcmstb.c | |
| parent | 142c168e0e50164e67c9399c28dedd65a307cfe5 (diff) | |
| download | lwn-2c218b9f1bcc30969195d472e7d29f59e4e2ced6.tar.gz lwn-2c218b9f1bcc30969195d472e7d29f59e4e2ced6.zip | |
gpio: brcmstb: switch to handle_level_irq flow
Reading and writing the gpio bank status register each time a pending
interrupt bit is serviced could cause new pending bits to be cleared
without servicing the associated interrupts.
By using the handle_level_irq flow instead of the handle_simple_irq
flow we get proper handling of interrupt masking as well as acking
of interrupts. The irq_ack method is added to support this.
Fixes: 19a7b6940b78 ("gpio: brcmstb: Add interrupt and wakeup source support")
Signed-off-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-brcmstb.c')
| -rw-r--r-- | drivers/gpio/gpio-brcmstb.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c index fd8c0412f8af..513de4936a25 100644 --- a/drivers/gpio/gpio-brcmstb.c +++ b/drivers/gpio/gpio-brcmstb.c @@ -114,6 +114,16 @@ static void brcmstb_gpio_irq_unmask(struct irq_data *d) brcmstb_gpio_set_imask(bank, d->hwirq, true); } +static void brcmstb_gpio_irq_ack(struct irq_data *d) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct brcmstb_gpio_bank *bank = gpiochip_get_data(gc); + struct brcmstb_gpio_priv *priv = bank->parent_priv; + u32 mask = BIT(d->hwirq); + + gc->write_reg(priv->reg_base + GIO_STAT(bank->id), mask); +} + static int brcmstb_gpio_irq_set_type(struct irq_data *d, unsigned int type) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); @@ -217,21 +227,16 @@ static void brcmstb_gpio_irq_bank_handler(struct brcmstb_gpio_bank *bank) { struct brcmstb_gpio_priv *priv = bank->parent_priv; struct irq_domain *irq_domain = bank->gc.irqdomain; - void __iomem *reg_base = priv->reg_base; unsigned long status; while ((status = brcmstb_gpio_get_active_irqs(bank))) { int bit; for_each_set_bit(bit, &status, 32) { - u32 stat = bank->gc.read_reg(reg_base + - GIO_STAT(bank->id)); if (bit >= bank->width) dev_warn(&priv->pdev->dev, "IRQ for invalid GPIO (bank=%d, offset=%d)\n", bank->id, bit); - bank->gc.write_reg(reg_base + GIO_STAT(bank->id), - stat | BIT(bit)); generic_handle_irq(irq_find_mapping(irq_domain, bit)); } } @@ -354,6 +359,7 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev, bank->irq_chip.name = dev_name(dev); bank->irq_chip.irq_mask = brcmstb_gpio_irq_mask; bank->irq_chip.irq_unmask = brcmstb_gpio_irq_unmask; + bank->irq_chip.irq_ack = brcmstb_gpio_irq_ack; bank->irq_chip.irq_set_type = brcmstb_gpio_irq_set_type; /* Ensures that all non-wakeup IRQs are disabled at suspend */ @@ -394,7 +400,7 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev, bank->irq_chip.irq_set_wake = brcmstb_gpio_irq_set_wake; err = gpiochip_irqchip_add(&bank->gc, &bank->irq_chip, 0, - handle_simple_irq, IRQ_TYPE_NONE); + handle_level_irq, IRQ_TYPE_NONE); if (err) return err; gpiochip_set_chained_irqchip(&bank->gc, &bank->irq_chip, |