linux-kernel - Re: [RFC][PATCH 5/7] PM: Asynchronous suspend and resume of PCI devices

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Message-Id: <1250578628.5351.64.camel@rzhang-dt>
Date:	Tue, 18 Aug 2009 14:57:08 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-acpi <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Greg KH <gregkh@...e.de>
Subject: Re: [RFC][PATCH 5/7] PM: Asynchronous suspend and resume of PCI
	devices

On Mon, 2009-08-17 at 08:20 +0800, Rafael J. Wysocki wrote:
> Set async_suspend for all PCI devices and PCIe port services.
> 
Alan said that we can not break the resume order of the uhci/ehci host
controllers on some platforms.

For example,
00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
Controller #5 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
Controller #2 (rev 02)
00:1a.7 must be resumed after 00:1a.0 and 00:1a.1

please refer to this thread:
http://marc.info/?l=linux-acpi&m=122996117918188&w=2

So I'm afraid we can not suspend/resume the PCI devices in parallel,
unless we add this off-tree dependency at the same time.

thanks,
rui
> ---
>  drivers/input/serio/i8042.c     |    2 ++
>  drivers/pci/pci.c               |    2 ++
>  drivers/pci/pcie/portdrv_core.c |    1 +
>  3 files changed, 5 insertions(+)
> 
> Index: linux-2.6/drivers/pci/pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pci.c
> +++ linux-2.6/drivers/pci/pci.c
> @@ -1409,6 +1409,8 @@ void pci_pm_init(struct pci_dev *dev)
>  	} else {
>  		dev->pme_support = 0;
>  	}
> +
> +	device_enable_async_suspend(&dev->dev, true);
>  }
>  
>  /**
> Index: linux-2.6/drivers/pci/pcie/portdrv_core.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pcie/portdrv_core.c
> +++ linux-2.6/drivers/pci/pcie/portdrv_core.c
> @@ -280,6 +280,7 @@ static void pcie_device_init(struct pci_
>  	dev_set_name(device, "%s:pcie%02x",
>  		 pci_name(parent), get_descriptor_id(port_type, service_type));
>  	device->parent = &parent->dev;
> +	device_enable_async_suspend(device, true);
>  }
>  
>  /**

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