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Commit eb9c39d0 authored by Jesse Barnes's avatar Jesse Barnes
Browse files

PCI: set device wakeup capable flag if platform support is present 



When PCI devices are initialized, we check whether they support PCI PM
caps and set the device can_wakeup flag if so.  However, some devices
may have platform provided wakeup events rather than PCI PME signals, so
we need to set can_wakeup in that case too.  Doing so should allow
wakeups from many more devices, especially on cost constrained systems.

Reported-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Tested-by: default avatarJoseph Chan <JosephChan@via.com.tw>
Acked-by: default avatar"Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 876e501a

drivers/pci/pci.c

+20 −0
Original line number Diff line number Diff line
@@ -1285,6 +1285,26 @@ void pci_pm_init(struct pci_dev *dev) 
	}

}



/**

 * platform_pci_wakeup_init - init platform wakeup if present

 * @dev: PCI device

 *

 * Some devices don't have PCI PM caps but can still generate wakeup

 * events through platform methods (like ACPI events).  If @dev supports

 * platform wakeup events, set the device flag to indicate as much.  This

 * may be redundant if the device also supports PCI PM caps, but double

 * initialization should be safe in that case.

 */

void platform_pci_wakeup_init(struct pci_dev *dev)

{

	if (!platform_pci_can_wakeup(dev))

		return;



	device_set_wakeup_capable(&dev->dev, true);

	device_set_wakeup_enable(&dev->dev, false);

	platform_pci_sleep_wake(dev, false);

}



/**

 * pci_add_save_buffer - allocate buffer for saving given capability registers

 * @dev: the PCI device

drivers/pci/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ struct pci_platform_pm_ops { 


extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops);

extern void pci_pm_init(struct pci_dev *dev);

extern void platform_pci_wakeup_init(struct pci_dev *dev);

extern void pci_allocate_cap_save_buffers(struct pci_dev *dev);



extern int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);

drivers/pci/probe.c

+1 −0
Original line number Diff line number Diff line
@@ -965,6 +965,7 @@ static void pci_init_capabilities(struct pci_dev *dev) 


	/* Power Management */

	pci_pm_init(dev);

	platform_pci_wakeup_init(dev);



	/* Vital Product Data */

	pci_vpd_pci22_init(dev);