lkml.org 
[lkml]   [2024]   [Apr]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] gpio: vf610: always set GPIO to input mode when used as interrupt source
On Tue, Apr 23, 2024 at 4:28 AM <haibo.chen@nxp.com> wrote:
>
> From: Haibo Chen <haibo.chen@nxp.com>
>
> Though the default pin configuration is INPUT, but if the prior stage does
> configure the pins as OUTPUT, then Linux will not reconfigure the pin as
> INPUT.
>
> e.g. When use one pin as interrupt source, and set as low level trigger,
> if prior stage already set this pin as OUTPUT low, then will meet interrupt
> storm.
>
> So always set GPIO to input mode when used as interrupt source to fix above
> case.
>
> Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
> ---
> drivers/gpio/gpio-vf610.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
> index 07e5e6323e86..305b0bcdee6f 100644
> --- a/drivers/gpio/gpio-vf610.c
> +++ b/drivers/gpio/gpio-vf610.c
> @@ -214,7 +214,7 @@ static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
> else
> irq_set_handler_locked(d, handle_edge_irq);
>
> - return 0;
> + return port->gc.direction_input(&port->gc, d->hwirq);
> }
>
> static void vf610_gpio_irq_mask(struct irq_data *d)
> --
> 2.34.1
>

Can you use gpiod_direction_output()? Otherwise the flags of the
descriptor will tell a different story.

Also: this doesn't matter here as it's a built-in driver but irq
callbacks accessing gpio_chip is a thing that still needs addressing
as it doesn't use SRCU. :(

Bart

\
 
 \ /
  Last update: 2024-05-27 17:58    [W:0.051 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site