linux-kernel - Re: [PATCH v6 1/2] PM: sleep: wakeirq: Add support for dedicated shared wake IRQ setup

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Message-ID: <p4cci7cup2breet6pluazfeeekdkmx7xoa3ubiuv2i7dsxkrde@53eh4grfndlq>
Date: Fri, 16 Jan 2026 16:41:42 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
	Pavel Machek <pavel@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Danilo Krummrich <dakr@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, linux-gpio@...r.kernel.org, 
	quic_vbadigan@...cinc.com, quic_mrana@...cinc.com, sherry.sun@....com
Subject: Re: [PATCH v6 1/2] PM: sleep: wakeirq: Add support for dedicated
 shared wake IRQ setup

On Thu, Nov 27, 2025 at 06:15:42PM +0530, Krishna Chaitanya Chundru wrote:
> Some devices require more flexibility when configuring their dedicated
> wake-up interrupts, such as support for IRQF_SHARED or other IRQ flags.
> This is particularly useful in PCIe systems where multiple endpoints
> (e.g., Wi-Fi and Bluetooth controllers) share a common WAKE# signal
> line which requests platform to re-establish power and reference clocks
> to the components. In such cases, drivers can use this new API
> dev_pm_set_dedicated_shared_wake_irq() to register a shared wake IRQ.
> 
> Update the internal helper __dev_pm_set_dedicated_wake_irq() to accept an
> irq_flags argument. Modify the existing dev_pm_set_dedicated_wake_irq()
> and dev_pm_set_dedicated_wake_irq_reverse() to preserve current behavior.
> 
> When IRQ regitsered with IRQF_SHARED we can't use IRQF_NO_AUTOEN flag,
> so after registering for irq, disable it explicitly.
> 
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---
>  drivers/base/power/wakeirq.c | 39 ++++++++++++++++++++++++++++++++++-----
>  include/linux/pm_wakeirq.h   |  6 ++++++
>  2 files changed, 40 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
> index 8aa28c08b2891f3af490175362cc1a759069bd50..df34a891d54bec8737a3ef174bdfa469c19133c4 100644
> --- a/drivers/base/power/wakeirq.c
> +++ b/drivers/base/power/wakeirq.c
> @@ -168,7 +168,8 @@ static irqreturn_t handle_threaded_wake_irq(int irq, void *_wirq)
>  	return IRQ_HANDLED;
>  }
>  
> -static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned int flag)
> +static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned int flag,
> +					   unsigned int irq_flags)
>  {
>  	struct wake_irq *wirq;
>  	int err;
> @@ -197,8 +198,7 @@ static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned
>  	 * so we use a threaded irq.
>  	 */
>  	err = request_threaded_irq(irq, NULL, handle_threaded_wake_irq,
> -				   IRQF_ONESHOT | IRQF_NO_AUTOEN,
> -				   wirq->name, wirq);
> +				   IRQF_ONESHOT | irq_flags, wirq->name, wirq);
>  	if (err)
>  		goto err_free_name;
>  
> @@ -234,7 +234,7 @@ static int __dev_pm_set_dedicated_wake_irq(struct device *dev, int irq, unsigned
>   */
>  int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
>  {
> -	return __dev_pm_set_dedicated_wake_irq(dev, irq, 0);
> +	return __dev_pm_set_dedicated_wake_irq(dev, irq, 0, IRQF_NO_AUTOEN);
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq);
>  
> @@ -255,10 +255,39 @@ EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq);
>   */
>  int dev_pm_set_dedicated_wake_irq_reverse(struct device *dev, int irq)
>  {
> -	return __dev_pm_set_dedicated_wake_irq(dev, irq, WAKE_IRQ_DEDICATED_REVERSE);
> +	return __dev_pm_set_dedicated_wake_irq(dev, irq, WAKE_IRQ_DEDICATED_REVERSE,
> +					       IRQF_NO_AUTOEN);
>  }
>  EXPORT_SYMBOL_GPL(dev_pm_set_dedicated_wake_irq_reverse);
>  
> +/**
> + * dev_pm_set_dedicated_shared_wake_irq - Request a dedicated shared wake-up interrupt
> + *                                        with custom flags
> + * @dev: Device entry
> + * @irq: Device wake-up interrupt
> + * @flags: IRQ flags (e.g., IRQ_TYPE_EDGE_FALLING)
> + *
> + * This API sets up a threaded interrupt handler for a device that has
> + * a shared wake-up interrupt in addition to the device IO interrupt. It also
> + * sets IRQ flags like IRQ_TYPE_EDGE_FALLING passed by the caller.
> + *
> + * Returns 0 on success or a negative error code on failure.
> + */
> +int dev_pm_set_dedicated_shared_wake_irq(struct device *dev, int irq, unsigned long flags)
> +{
> +	struct wake_irq *wirq;
> +	int ret;
> +
> +	ret =  __dev_pm_set_dedicated_wake_irq(dev, irq, 0, IRQF_SHARED | flags);
> +	if (!ret) {
> +		wirq = dev->power.wakeirq;
> +		disable_irq_nosync(wirq->irq);
> +	}

Maybe it is just me, but I'd prefer the below pattern to make it easier to read.

	if (ret)
		return ret;

	wirq = dev->power.wakeirq;
	disable_irq_nosync(wirq->irq);

	return 0;

- Mani

-- 
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