linux-kernel - Re: [PATCH v6 4/4] pinctrl: qcom: Don't clear pending interrupts when enabling

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Date:   Thu, 14 Jan 2021 18:08:33 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Jason Cooper <jason@...edaemon.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Neeraj Upadhyay <neeraju@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, Maulik Shah <mkshah@...eaurora.org>,
        linux-gpio@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/4] pinctrl: qcom: Don't clear pending interrupts when enabling

Quoting Douglas Anderson (2021-01-14 15:40:27)
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 192ed31eabf4..712a693425fc 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -1097,16 +1128,11 @@ static int msm_gpio_irq_reqres(struct irq_data *d)
>         }
>  
>         /*
> -        * Clear the interrupt that may be pending before we enable
> -        * the line.
> -        * This is especially a problem with the GPIOs routed to the
> -        * PDC. These GPIOs are direct-connect interrupts to the GIC.
> -        * Disabling the interrupt line at the PDC does not prevent
> -        * the interrupt from being latched at the GIC. The state at
> -        * GIC needs to be cleared before enabling.
> +        * The disable / clear-enable workaround we do in msm_pinmux_set_mux()
> +        * only works if disable is not lazy since we only clear any bogus
> +        # interrupt in hardware. Explicitly mark the interrupt as UNLAZY.

Ah! What is # doing there?

>          */
> -       if (d->parent_data && test_bit(d->hwirq, pctrl->skip_wake_irqs))
> -               irq_chip_set_parent_state(d, IRQCHIP_STATE_PENDING, 0);
> +       irq_set_status_flags(d->irq, IRQ_DISABLE_UNLAZY);
>