Re: [PATCH v4 2/7] pinctrl: qcom: Use return value from irq_set_wake call

[Maulik Shah]

Hi,

On 8/12/2020 1:04 AM, Stephen Boyd wrote:
> Quoting Maulik Shah (2020-08-10 04:20:55)
> > msmgpio irqchip is not using return value of irq_set_wake call.
> > Start using it.
> Does this work when the irq parent isn't setup in a hierarchy?
yes it works fine even when parent isn't setup in hierarchy.
> I seem to
> recall that this was written this way because sometimes
> irq_set_irq_wake() would fail for the summary irq so it was a best
> effort setting of wake on the summary line.
Thanks for pointing this.

It was written this way since previously GIC driver neither had 
IRQCHIP_SKIP_SET_WAKE flag nor it implemented .irq_set_wake callback,

so the call to irq_set_irq_wake() to set_irq_wake_real() used to return 
error -ENXIO in past.

I see this is already taken care now in GIC drivers by adding 
IRQCHIP_SKIP_SET_WAKE flag.

> > Fixes: e35a6ae0eb3a ("pinctrl/msm: Setup GPIO chip in hierarchy")
> > Signed-off-by: Maulik Shah <mkshah@xxxxxxxxxxxxxx>
> > Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> > ---
> >   drivers/pinctrl/qcom/pinctrl-msm.c | 8 +++-----
> >   1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> > index 90edf61..c264561 100644
> > --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> > +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> > @@ -1077,12 +1077,10 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
> >           * when TLMM is powered on. To allow that, enable the GPIO
> >           * summary line to be wakeup capable at GIC.
> >           */
> > -       if (d->parent_data)
> > -               irq_chip_set_wake_parent(d, on);
> > -
> > -       irq_set_irq_wake(pctrl->irq, on);
> > +       if (d->parent_data && test_bit(d->hwirq, pctrl->skip_wake_irqs))
> > +               return irq_chip_set_wake_parent(d, on);
> So this bit is probably fine.
>
> >   
> > -       return 0;
> > +       return irq_set_irq_wake(pctrl->irq, on);
> But this one is probably not fine.

As per above both of them are fine.

Thanks,
Maulik

> >   }
> >   
> >   static int msm_gpio_irq_reqres(struct irq_data *d)

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