linux-kernel - Re: [PATCH v4 2/7] pinctrl: qcom: Use return value from irq_set

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Message-ID: <159717444178.1360974.6520145243224264090@swboyd.mtv.corp.google.com>
Date:   Tue, 11 Aug 2020 12:34:01 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Maulik Shah <mkshah@...eaurora.org>, bjorn.andersson@...aro.org,
        evgreen@...omium.org, linus.walleij@...aro.org, maz@...nel.org,
        mka@...omium.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-gpio@...r.kernel.org, agross@...nel.org, tglx@...utronix.de,
        jason@...edaemon.net, dianders@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: Re: [PATCH v4 2/7] pinctrl: qcom: Use return value from irq_set_wake call

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? 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.

> 
> Fixes: e35a6ae0eb3a ("pinctrl/msm: Setup GPIO chip in hierarchy")
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> ---
>  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.

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