| 123456789101112131415161718192021222324 |
- What: /sys/devices/.../state_synced
- Date: May 2020
- Contact: Saravana Kannan <[email protected]>
- Description:
- The /sys/devices/.../state_synced attribute is only present for
- devices whose bus types or driver provides the .sync_state()
- callback. The number read from it (0 or 1) reflects the value
- of the device's 'state_synced' field. A value of 0 means the
- .sync_state() callback hasn't been called yet. A value of 1
- means the .sync_state() callback has been called.
- Generally, if a device has sync_state() support and has some of
- the resources it provides enabled at the time the kernel starts
- (Eg: enabled by hardware reset or bootloader or anything that
- run before the kernel starts), then it'll keep those resources
- enabled and in a state that's compatible with the state they
- were in at the start of the kernel. The device will stop doing
- this only when the sync_state() callback has been called --
- which happens only when all its consumer devices are registered
- and have probed successfully. Resources that were left disabled
- at the time the kernel starts are not affected or limited in
- any way by sync_state() callbacks.
|
