diff options
Diffstat (limited to 'Documentation/power/devices.txt')
-rw-r--r-- | Documentation/power/devices.txt | 34 |
1 files changed, 5 insertions, 29 deletions
diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt index 421e7d00ffd0..c9abbd86bc18 100644 --- a/Documentation/power/devices.txt +++ b/Documentation/power/devices.txt | |||
@@ -75,9 +75,6 @@ may need to apply in domain-specific ways to their devices: | |||
75 | struct bus_type { | 75 | struct bus_type { |
76 | ... | 76 | ... |
77 | int (*suspend)(struct device *dev, pm_message_t state); | 77 | int (*suspend)(struct device *dev, pm_message_t state); |
78 | int (*suspend_late)(struct device *dev, pm_message_t state); | ||
79 | |||
80 | int (*resume_early)(struct device *dev); | ||
81 | int (*resume)(struct device *dev); | 78 | int (*resume)(struct device *dev); |
82 | }; | 79 | }; |
83 | 80 | ||
@@ -226,20 +223,7 @@ The phases are seen by driver notifications issued in this order: | |||
226 | 223 | ||
227 | This call should handle parts of device suspend logic that require | 224 | This call should handle parts of device suspend logic that require |
228 | sleeping. It probably does work to quiesce the device which hasn't | 225 | sleeping. It probably does work to quiesce the device which hasn't |
229 | been abstracted into class.suspend() or bus.suspend_late(). | 226 | been abstracted into class.suspend(). |
230 | |||
231 | 3 bus.suspend_late(dev, message) is called with IRQs disabled, and | ||
232 | with only one CPU active. Until the bus.resume_early() phase | ||
233 | completes (see later), IRQs are not enabled again. This method | ||
234 | won't be exposed by all busses; for message based busses like USB, | ||
235 | I2C, or SPI, device interactions normally require IRQs. This bus | ||
236 | call may be morphed into a driver call with bus-specific parameters. | ||
237 | |||
238 | This call might save low level hardware state that might otherwise | ||
239 | be lost in the upcoming low power state, and actually put the | ||
240 | device into a low power state ... so that in some cases the device | ||
241 | may stay partly usable until this late. This "late" call may also | ||
242 | help when coping with hardware that behaves badly. | ||
243 | 227 | ||
244 | The pm_message_t parameter is currently used to refine those semantics | 228 | The pm_message_t parameter is currently used to refine those semantics |
245 | (described later). | 229 | (described later). |
@@ -351,19 +335,11 @@ devices processing each phase's calls before the next phase begins. | |||
351 | 335 | ||
352 | The phases are seen by driver notifications issued in this order: | 336 | The phases are seen by driver notifications issued in this order: |
353 | 337 | ||
354 | 1 bus.resume_early(dev) is called with IRQs disabled, and with | 338 | 1 bus.resume(dev) reverses the effects of bus.suspend(). This may |
355 | only one CPU active. As with bus.suspend_late(), this method | 339 | be morphed into a device driver call with bus-specific parameters; |
356 | won't be supported on busses that require IRQs in order to | 340 | implementations may sleep. |
357 | interact with devices. | ||
358 | |||
359 | This reverses the effects of bus.suspend_late(). | ||
360 | |||
361 | 2 bus.resume(dev) is called next. This may be morphed into a device | ||
362 | driver call with bus-specific parameters; implementations may sleep. | ||
363 | |||
364 | This reverses the effects of bus.suspend(). | ||
365 | 341 | ||
366 | 3 class.resume(dev) is called for devices associated with a class | 342 | 2 class.resume(dev) is called for devices associated with a class |
367 | that has such a method. Implementations may sleep. | 343 | that has such a method. Implementations may sleep. |
368 | 344 | ||
369 | This reverses the effects of class.suspend(), and would usually | 345 | This reverses the effects of class.suspend(), and would usually |