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SubjectRe: [RFC][PATCH 5/7] PM: Asynchronous suspend and resume of PCI devices
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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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