Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 21d6b7e1 authored by pavel@ucw.cz's avatar pavel@ucw.cz Committed by Linus Torvalds
Browse files

[PATCH] suspend: PCI power managment reference implementation 



Added reference implementation of suspend and resume routines.

From: Shaohua Li <shaohua.li@intel.com>

  build fix

Signed-off-by: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ac255752

Documentation/power/pci.txt

+38 −0
Original line number Diff line number Diff line
@@ -291,6 +291,44 @@ a request to enable wake events from D3, two calls should be made to 
pci_enable_wake (one for both D3hot and D3cold).





A reference implementation

-------------------------

.suspend()

{

	/* driver specific operations */



	/* Disable IRQ */

	free_irq();

	/* If using MSI */

	pci_disable_msi();



	pci_save_state();

	pci_enable_wake();

	/* Disable IO/bus master/irq router */

	pci_disable_device();

	pci_set_power_state(pci_choose_state());

}



.resume()

{

	pci_set_power_state(PCI_D0);

	pci_restore_state();

	/* device's irq possibly is changed, driver should take care */

	pci_enable_device();

	pci_set_master();



	/* if using MSI, device's vector possibly is changed */

	pci_enable_msi();



	request_irq();

	/* driver specific operations; */

}



This is a typical implementation. Drivers can slightly change the order

of the operations in the implementation, ignore some operations or add

more deriver specific operations in it, but drivers should do something like

this on the whole.



5. Resources

~~~~~~~~~~~~