linux-kernel - Re: [PATCH v5 3/4] pinctrl: qcom: Properly clear "intr_ack

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Message-ID: <161060779688.3661239.1942891250020009723@swboyd.mtv.corp.google.com>
Date:   Wed, 13 Jan 2021 23:03:16 -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:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Maulik Shah <mkshah@...eaurora.org>,
        linux-gpio@...r.kernel.org,
        Srinivas Ramana <sramana@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/4] pinctrl: qcom: Properly clear "intr_ack_high" interrupts when unmasking

Quoting Douglas Anderson (2021-01-08 09:35:15)
> In commit 4b7618fdc7e6 ("pinctrl: qcom: Add irq_enable callback for
> msm gpio") we tried to Ack interrupts during unmask.  However, that
> patch forgot to check "intr_ack_high" so, presumably, it only worked
> for a certain subset of SoCs.
> 
> Let's add a small accessor so we don't need to open-code the logic in
> both places.
> 
> This was found by code inspection.  I don't have any access to the
> hardware in question nor software that needs the Ack during unmask.
> 
> Fixes: 4b7618fdc7e6 ("pinctrl: qcom: Add irq_enable callback for msm gpio")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>

One minor nit below.

> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 1787ada6bfab..a6b0c17e2f78 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -96,6 +96,14 @@ MSM_ACCESSOR(intr_cfg)
>  MSM_ACCESSOR(intr_status)
>  MSM_ACCESSOR(intr_target)
>  
> +static void msm_ack_intr_status(struct msm_pinctrl *pctrl,
> +                               const struct msm_pingroup *g)
> +{
> +       u32 val = (g->intr_ack_high) ? BIT(g->intr_status_bit) : 0;

Would be nice to remove that extra parenthesis too.

> +
> +       msm_writel_intr_status(val, pctrl, g);
> +}
> +
>  static int msm_get_groups_count(struct pinctrl_dev *pctldev)
>  {
>         struct msm_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> @@ -903,8 +910,7 @@ static void msm_gpio_irq_ack(struct irq_data *d)
>  
>         raw_spin_lock_irqsave(&pctrl->lock, flags);
>  
> -       val = (g->intr_ack_high) ? BIT(g->intr_status_bit) : 0;

Even though it is here.