linux-kernel - Re: [RFC 2/3] PCI/PM: Make PCI devices notified when its power resource turned on

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Message-Id: <201209202133.44738.rjw@sisk.pl>
Date:	Thu, 20 Sep 2012 21:33:44 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [RFC 2/3] PCI/PM: Make PCI devices notified when its power resource turned on

On Monday, September 17, 2012, Huang Ying wrote:
> A set of power resources may be shared by multiple devices.  When all
> devices share one set of power resources is put into D3_COLD state,
> the power resources will be turned off.  When one of the device is
> waked, the power resource will be turned on and all devices share it
> will be powered on to D0uninitialized state.  These devices should be
> resumed, so that they can get opportunity to go to low power state
> later.
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>

Makes sense.

Acked-by: Rafael J. Wysocki <rjw@...k.pl>

> ---
>  drivers/acpi/pci_bind.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- a/drivers/acpi/pci_bind.c
> +++ b/drivers/acpi/pci_bind.c
> @@ -45,6 +45,7 @@ static int acpi_pci_unbind(struct acpi_d
>  
>  	device_set_run_wake(&dev->dev, false);
>  	pci_acpi_remove_pm_notifier(device);
> +	acpi_power_resource_unregister_device(dev, device->handle);
>  
>  	if (!dev->subordinate)
>  		goto out;
> @@ -71,6 +72,7 @@ static int acpi_pci_bind(struct acpi_dev
>  		return 0;
>  
>  	pci_acpi_add_pm_notifier(device, dev);
> +	acpi_power_resource_register_device(dev, device->handle);
>  	if (device->wakeup.flags.run_wake)
>  		device_set_run_wake(&dev->dev, true);
>  
> 
> 

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