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| author | pavel@ucw.cz <pavel@ucw.cz> | 2005-06-26 01:55:16 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-26 03:24:34 +0400 |
| commit | 21d6b7e18f70c847c867aafb3109405b48424388 (patch) | |
| tree | 4e4a965f411453edb39263a82a3a590224ad1e86 /Documentation/power/pci.txt | |
| parent | ac25575203c11145066ea5cb583354cb5f0a8ade (diff) | |
| download | linux-21d6b7e18f70c847c867aafb3109405b48424388.tar.xz | |
[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: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/power/pci.txt')
| -rw-r--r-- | Documentation/power/pci.txt | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/power/pci.txt b/Documentation/power/pci.txt index 35b1a7dae342..6fc9d511fc39 100644 --- a/Documentation/power/pci.txt +++ b/Documentation/power/pci.txt @@ -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 ~~~~~~~~~~~~ |