[PATCH 2/2] gpio/aspeed-sgpio: don't enable all interrupts by default

[Joel Stanley]

On Wed, 15 Jul 2020 at 14:06, Jeremy Kerr <jk at codeconstruct.com.au> wrote:
>
> Currently, the IRQ setup for the SGPIO driver enables all interrupts for
> dual-edge trigger mode. Since the default handler is handle_bad_irq, any
> state change on input GPIOs will trigger bad IRQ warnings.
>
> This change applies sensible (disabled) IRQ defaults.
>
> Signed-off-by: Jeremy Kerr <jk at codeconstruct.com.au>
> ---
>  drivers/gpio/gpio-aspeed-sgpio.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpio-aspeed-sgpio.c b/drivers/gpio/gpio-aspeed-sgpio.c
> index 927d46f159b8..23a3a40901d6 100644
> --- a/drivers/gpio/gpio-aspeed-sgpio.c
> +++ b/drivers/gpio/gpio-aspeed-sgpio.c

I've re-ordered the lines in the diff to make it easier to review:

> @@ -451,9 +451,7 @@ static int aspeed_sgpio_setup_irqs(struct aspeed_sgpio *gpio,
>                 /* trigger type is edge */
>                 iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type1));
>                 /* dual edge trigger mode. */
> -               iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_type2));
> +               iowrite32(0x00000000, bank_reg(gpio, bank, reg_irq_type2));

You're changing the trigger mode from dual edge to single edge.

> -               /* enable irq */
> -               iowrite32(0xffffffff, bank_reg(gpio, bank, reg_irq_enable));

And also removing the enabling of IRQs. This part makes sense, as it's
what the commit message says.

If you think a sensible default should be single edge (and I would
agree with that change), perhaps update the comment to say "set single
edge trigger mode" and mention it in your commit message.

Cheers,

Joel