linux-kernel - RE: [PATCH AUTOSEL 5.10 10/28] pinctrl: amd: Fix wakeups when IRQ is shared with SCI

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Message-ID: <SA0PR12MB4510E32F459655B6387A8660E2669@SA0PR12MB4510.namprd12.prod.outlook.com>
Date:   Mon, 29 Nov 2021 14:47:37 +0000
From:   "Limonciello, Mario" <Mario.Limonciello@....com>
To:     Sasha Levin <sashal@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Joerie de Gram <j.de.gram@...il.com>,
        "Natikar, Basavaraj" <Basavaraj.Natikar@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: RE: [PATCH AUTOSEL 5.10 10/28] pinctrl: amd: Fix wakeups when IRQ is
 shared with SCI



> -----Original Message-----
> From: Sasha Levin <sashal@...nel.org>
> Sent: Thursday, November 25, 2021 20:33
> To: linux-kernel@...r.kernel.org; stable@...r.kernel.org
> Cc: Limonciello, Mario <Mario.Limonciello@....com>; Joerie de Gram
> <j.de.gram@...il.com>; Natikar, Basavaraj <Basavaraj.Natikar@....com>;
> Linus Walleij <linus.walleij@...aro.org>; Sasha Levin <sashal@...nel.org>; S-
> k, Shyam-sundar <Shyam-sundar.S-k@....com>; linux-
> gpio@...r.kernel.org
> Subject: [PATCH AUTOSEL 5.10 10/28] pinctrl: amd: Fix wakeups when IRQ is
> shared with SCI
> 
> From: Mario Limonciello <mario.limonciello@....com>
> 
> [ Upstream commit 2d54067fcd23aae61e23508425ae5b29e973573d ]
> 
> On some Lenovo AMD Gen2 platforms the IRQ for the SCI and pinctrl drivers
> are shared.  Due to how the s2idle loop handling works, this case needs
> an extra explicit check whether the interrupt was caused by SCI or by
> the GPIO controller.
> 
> To fix this rework the existing IRQ handler function to function as a
> checker and an IRQ handler depending on the calling arguments.
> 
> BugLink:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitla
> b.freedesktop.org%2Fdrm%2Famd%2F-
> %2Fissues%2F1738&amp;data=04%7C01%7Cmario.limonciello%40amd.com%
> 7Ce14b7ddf8d1143b6649208d9b0853519%7C3dd8961fe4884e608e11a82d994
> e183d%7C0%7C0%7C637734908448086367%7CUnknown%7CTWFpbGZsb3d8
> eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3
> D%7C3000&amp;sdata=BHHY3gLu2pQIJ1nvSE0VNQOaioTC0QdBM44ze3HXrtk
> %3D&amp;reserved=0
> Reported-by: Joerie de Gram <j.de.gram@...il.com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> Acked-by: Basavaraj Natikar <Basavaraj.Natikar@....com>
> Link:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.
> kernel.org%2Fr%2F20211101014853.6177-2-
> mario.limonciello%40amd.com&amp;data=04%7C01%7Cmario.limonciello%4
> 0amd.com%7Ce14b7ddf8d1143b6649208d9b0853519%7C3dd8961fe4884e608
> e11a82d994e183d%7C0%7C0%7C637734908448086367%7CUnknown%7CTWF
> pbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXV
> CI6Mn0%3D%7C3000&amp;sdata=zUkTF851CdUmrY1z3YZbYrnVrjHQaVfb1%
> 2Bg2dx28ZNA%3D&amp;reserved=0
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  drivers/pinctrl/pinctrl-amd.c | 29 ++++++++++++++++++++++++++---
>  1 file changed, 26 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
> index e20bcc835d6a8..54dfa0244422c 100644
> --- a/drivers/pinctrl/pinctrl-amd.c
> +++ b/drivers/pinctrl/pinctrl-amd.c
> @@ -520,14 +520,14 @@ static struct irq_chip amd_gpio_irqchip = {
> 
>  #define PIN_IRQ_PENDING	(BIT(INTERRUPT_STS_OFF) |
> BIT(WAKE_STS_OFF))
> 
> -static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
> +static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
>  {
>  	struct amd_gpio *gpio_dev = dev_id;
>  	struct gpio_chip *gc = &gpio_dev->gc;
> -	irqreturn_t ret = IRQ_NONE;
>  	unsigned int i, irqnr;
>  	unsigned long flags;
>  	u32 __iomem *regs;
> +	bool ret = false;
>  	u32  regval;
>  	u64 status, mask;
> 
> @@ -549,6 +549,14 @@ static irqreturn_t amd_gpio_irq_handler(int irq, void
> *dev_id)
>  		/* Each status bit covers four pins */
>  		for (i = 0; i < 4; i++) {
>  			regval = readl(regs + i);
> +			/* caused wake on resume context for shared IRQ */
> +			if (irq < 0 && (regval & BIT(WAKE_STS_OFF))) {
> +				dev_dbg(&gpio_dev->pdev->dev,
> +					"Waking due to GPIO %d: 0x%x",
> +					irqnr + i, regval);
> +				return true;
> +			}
> +
>  			if (!(regval & PIN_IRQ_PENDING) ||
>  			    !(regval & BIT(INTERRUPT_MASK_OFF)))
>  				continue;
> @@ -574,9 +582,12 @@ static irqreturn_t amd_gpio_irq_handler(int irq, void
> *dev_id)
>  			}
>  			writel(regval, regs + i);
>  			raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
> -			ret = IRQ_HANDLED;
> +			ret = true;
>  		}
>  	}
> +	/* did not cause wake on resume context for shared IRQ */
> +	if (irq < 0)
> +		return false;
> 
>  	/* Signal EOI to the GPIO unit */
>  	raw_spin_lock_irqsave(&gpio_dev->lock, flags);
> @@ -588,6 +599,16 @@ static irqreturn_t amd_gpio_irq_handler(int irq, void
> *dev_id)
>  	return ret;
>  }
> 
> +static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
> +{
> +	return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
> +}
> +
> +static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
> +{
> +	return do_amd_gpio_irq_handler(-1, dev_id);
> +}
> +
>  static int amd_get_groups_count(struct pinctrl_dev *pctldev)
>  {
>  	struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
> @@ -958,6 +979,7 @@ static int amd_gpio_probe(struct platform_device
> *pdev)
>  		goto out2;
> 
>  	platform_set_drvdata(pdev, gpio_dev);
> +	acpi_register_wakeup_handler(gpio_dev->irq,
> amd_gpio_check_wake, gpio_dev);
> 
>  	dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
>  	return ret;
> @@ -975,6 +997,7 @@ static int amd_gpio_remove(struct platform_device
> *pdev)
>  	gpio_dev = platform_get_drvdata(pdev);
> 
>  	gpiochip_remove(&gpio_dev->gc);
> +	acpi_unregister_wakeup_handler(amd_gpio_check_wake,
> gpio_dev);
> 
>  	return 0;
>  }
> --
> 2.33.0

Sasha,

No concerns for me to 5.10, but would you mind also sending this to 5.14.y and 5.15.y too?  I didn't see it sent up for either.

Thanks,