Commit 21d6b7e1 authored by pavel@ucw.cz's avatar pavel@ucw.cz Committed by Linus Torvalds
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[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
......@@ -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
~~~~~~~~~~~~
......
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