linux-kernel - Re: [PATCH v3 6/9] drivers: pinctrl: msm: setup GPIO irqchip hierarchy

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Date:   Thu, 07 Mar 2019 16:59:34 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Lina Iyer <ilina@...eaurora.org>, evgreen@...omium.org,
        marc.zyngier@....com
Cc:     linux-kernel@...r.kernel.org, rplsssn@...eaurora.org,
        linux-arm-msm@...r.kernel.org, thierry.reding@...il.com,
        bjorn.andersson@...aro.org, dianders@...omium.org,
        linus.walleij@...aro.org, Lina Iyer <ilina@...eaurora.org>
Subject: Re: [PATCH v3 6/9] drivers: pinctrl: msm: setup GPIO irqchip hierarchy

Quoting Lina Iyer (2019-02-22 14:18:47)
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index ee8119879c4c..83053b45982e 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -890,6 +918,9 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
>  
>         raw_spin_unlock_irqrestore(&pctrl->lock, flags);

Can we remove the above hunk of code in this function? From what I can
tell we're trying to set wake on the GIC SPI line and that won't ever
work because it doesn't support wakeup support. Furthermore, I get a
lockdep splat when I try to set wake on a GPIO irq with this patchset
applied. It's probably a false positive though because it's warning
about an AA deadlock with the irq descriptor lock, which is aliased
between the two controllers.

>  
> +       if (d->parent_data)
> +               irq_chip_set_wake_parent(d, on);
> +
>         return 0;
>  }
>  

Here's a patch on top. If you need my signed-off-by please feel free to
add it:

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

-----8<-------
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index cdbc06ec5e96..4e81dad80a4d 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -852,20 +852,10 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 
 static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
 {
-	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
-	struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&pctrl->lock, flags);
-
-	irq_set_irq_wake(pctrl->irq, on);
-
-	raw_spin_unlock_irqrestore(&pctrl->lock, flags);
-
 	if (d->parent_data)
-		irq_chip_set_wake_parent(d, on);
+		return irq_chip_set_wake_parent(d, on);
 
-	return 0;
+	return -ENOSYS;
 }
 
 static int msm_gpio_irq_reqres(struct irq_data *d)