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

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Message-ID: <YAByp5pL7vg9ZUT9@builder.lan>
Date:   Thu, 14 Jan 2021 10:34:47 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Neeraj Upadhyay <neeraju@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Maulik Shah <mkshah@...eaurora.org>,
        linux-gpio@...r.kernel.org,
        Srinivas Ramana <sramana@...eaurora.org>,
        linux-arm-msm@...r.kernel.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

On Fri 08 Jan 11:35 CST 2021, Douglas Anderson wrote:

> 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: Bjorn Andersson <bjorn.andersson@...aro.org>

And I agree with Stephen's comment about the unnecessary parenthesis
around g->intr_ack_high.

Regards,
Bjorn

> ---
> It should be noted that this code will be moved in the next patch.  In
> theory this could be squashed into the next patch but it seems more
> documenting to have this as a separate patch.
> 
> Changes in v5:
> - ("pinctrl: qcom: Properly clear "intr_ack_high" interrupts...") new for v5.
> 
>  drivers/pinctrl/qcom/pinctrl-msm.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> 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;
> +
> +	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);
> @@ -798,7 +806,7 @@ static void msm_gpio_irq_clear_unmask(struct irq_data *d, bool status_clear)
>  	 * when the interrupt is not in use.
>  	 */
>  	if (status_clear)
> -		msm_writel_intr_status(0, pctrl, g);
> +		msm_ack_intr_status(pctrl, g);
>  
>  	val = msm_readl_intr_cfg(pctrl, g);
>  	val |= BIT(g->intr_raw_status_bit);
> @@ -891,7 +899,6 @@ static void msm_gpio_irq_ack(struct irq_data *d)
>  	struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
>  	const struct msm_pingroup *g;
>  	unsigned long flags;
> -	u32 val;
>  
>  	if (test_bit(d->hwirq, pctrl->skip_wake_irqs)) {
>  		if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
> @@ -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;
> -	msm_writel_intr_status(val, pctrl, g);
> +	msm_ack_intr_status(pctrl, g);
>  
>  	if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
>  		msm_gpio_update_dual_edge_pos(pctrl, g, d);
> -- 
> 2.29.2.729.g45daf8777d-goog
>