From: Pavel Machek Added reference implementation of suspend and resume routines. From: Shaohua Li Signed-off-by: Pavel Machek Signed-off-by: Andrew Morton --- Documentation/power/pci.txt | 38 ++++++++++++++++++++++++++++++++++++++ 1 files changed, 38 insertions(+) diff -puN Documentation/power/pci.txt~suspend-pci-power-managment-reference-implementation Documentation/power/pci.txt --- 25/Documentation/power/pci.txt~suspend-pci-power-managment-reference-implementation Fri May 27 16:08:04 2005 +++ 25-akpm/Documentation/power/pci.txt Fri May 27 16:08:04 2005 @@ -291,6 +291,44 @@ a request to enable wake events from D3, 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 ~~~~~~~~~~~~ _