Re: [PATCH] gpio: dwapb: fix missing first irq for edgeboth irq type

[Jisheng Zhang <jszhang@xxxxxxxxxxx>]

On Fri, 9 Jun 2017 11:26:19 +0200 Linus Walleij wrote:

> 
> On Fri, Jun 2, 2017 at 1:27 AM,  <xgchenshy@xxxxxxxxx> wrote:
> > From: Xiaoguang Chen <xgchenshy@xxxxxxxxx>
> >
> > dwapb_irq_set_type overwrites polarity register value for
> > IRQ_TYPE_EDGE_BOTH case. If the polarity of one gpio is 0
> > by default, then it will set falling edge irq trigger.
> > and the gpio may requires rising edge irq for the first time,
> > and it will be missed.
> >
> > Do not overwrite polarity register for IRQ_TYPE_EDGE_BOTH case
> > can solve this issue.

I think this is a correct fix.

> >
> > Signed-off-by: Xiaoguang Chen <xgchenshy@xxxxxxxxx>

Tested-by: Jisheng Zhang <jszhang@xxxxxxxxxxx>

> > ---
> >  drivers/gpio/gpio-dwapb.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> > index f051c45..80913e4 100644
> > --- a/drivers/gpio/gpio-dwapb.c
> > +++ b/drivers/gpio/gpio-dwapb.c
> > @@ -288,7 +288,8 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
> >         irq_setup_alt_chip(d, type);
> >
> >         dwapb_write(gpio, GPIO_INTTYPE_LEVEL, level);
> > -       dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
> > +       if （type != IRQ_TYPE_EDGE_BOTH）
> > +               dwapb_write(gpio, GPIO_INT_POLARITY, polarity);
> >         spin_unlock_irqrestore(&gc->bgpio_lock, flags);
> >
> >         return 0;
> > --
> > 2.8.4 (Apple Git-73)
> >  

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