lkml.org 
[lkml]   [2020]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v1] gpio: dwapb: mask/unmask IRQ when disable/enable it
Sorry for top posting but I need the help of the irqchip maintainer
Marc Z to hash this out.

The mask/unmask/disable/enable semantics is something that
you need to work with every day to understand right.

Yours,
Linus Walleij

On Mon, Nov 30, 2020 at 10:36 AM Luo Jiaxing <luojiaxing@huawei.com> wrote:
>
> The mask and unmask registers are not configured in dwapb_irq_enable() and
> dwapb_irq_disable(). In the following situations, the IRQ will be masked by
> default after the IRQ is enabled:
>
> mask IRQ -> disable IRQ -> enable IRQ
>
> In this case, the IRQ status of GPIO controller is inconsistent with it's
> irq_data too. For example, in __irq_enable(), IRQD_IRQ_DISABLED and
> IRQD_IRQ_MASKED are both clear, but GPIO controller do not perform unmask.
>
> Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
> ---
> drivers/gpio/gpio-dwapb.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index 2a9046c..ca654eb 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -270,6 +270,8 @@ static void dwapb_irq_enable(struct irq_data *d)
> u32 val;
>
> spin_lock_irqsave(&gc->bgpio_lock, flags);
> + val = dwapb_read(gpio, GPIO_INTMASK) & ~BIT(irqd_to_hwirq(d));
> + dwapb_write(gpio, GPIO_INTMASK, val);
> val = dwapb_read(gpio, GPIO_INTEN);
> val |= BIT(irqd_to_hwirq(d));
> dwapb_write(gpio, GPIO_INTEN, val);
> @@ -284,6 +286,8 @@ static void dwapb_irq_disable(struct irq_data *d)
> u32 val;
>
> spin_lock_irqsave(&gc->bgpio_lock, flags);
> + val = dwapb_read(gpio, GPIO_INTMASK) | BIT(irqd_to_hwirq(d));
> + dwapb_write(gpio, GPIO_INTMASK, val);
> val = dwapb_read(gpio, GPIO_INTEN);
> val &= ~BIT(irqd_to_hwirq(d));
> dwapb_write(gpio, GPIO_INTEN, val);
> --
> 2.7.4
>

\
 
 \ /
  Last update: 2020-12-05 23:01    [W:0.171 / U:2.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site