diff options
author | pavel@ucw.cz <pavel@ucw.cz> | 2005-06-25 17:55:16 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-25 19:24:34 -0400 |
commit | 21d6b7e18f70c847c867aafb3109405b48424388 (patch) | |
tree | 4e4a965f411453edb39263a82a3a590224ad1e86 /Documentation/power/pci.txt | |
parent | ac25575203c11145066ea5cb583354cb5f0a8ade (diff) |
[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 | |||
291 | pci_enable_wake (one for both D3hot and D3cold). | 291 | pci_enable_wake (one for both D3hot and D3cold). |
292 | 292 | ||
293 | 293 | ||
294 | A reference implementation | ||
295 | ------------------------- | ||
296 | .suspend() | ||
297 | { | ||
298 | /* driver specific operations */ | ||
299 | |||
300 | /* Disable IRQ */ | ||
301 | free_irq(); | ||
302 | /* If using MSI */ | ||
303 | pci_disable_msi(); | ||
304 | |||
305 | pci_save_state(); | ||
306 | pci_enable_wake(); | ||
307 | /* Disable IO/bus master/irq router */ | ||
308 | pci_disable_device(); | ||
309 | pci_set_power_state(pci_choose_state()); | ||
310 | } | ||
311 | |||
312 | .resume() | ||
313 | { | ||
314 | pci_set_power_state(PCI_D0); | ||
315 | pci_restore_state(); | ||
316 | /* device's irq possibly is changed, driver should take care */ | ||
317 | pci_enable_device(); | ||
318 | pci_set_master(); | ||
319 | |||
320 | /* if using MSI, device's vector possibly is changed */ | ||
321 | pci_enable_msi(); | ||
322 | |||
323 | request_irq(); | ||
324 | /* driver specific operations; */ | ||
325 | } | ||
326 | |||
327 | This is a typical implementation. Drivers can slightly change the order | ||
328 | of the operations in the implementation, ignore some operations or add | ||
329 | more deriver specific operations in it, but drivers should do something like | ||
330 | this on the whole. | ||
331 | |||
294 | 5. Resources | 332 | 5. Resources |
295 | ~~~~~~~~~~~~ | 333 | ~~~~~~~~~~~~ |
296 | 334 | ||