On Mon, Nov 20, 2017 at 1:25 PM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: > On 18 November 2017 at 15:31, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: >> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> >> >> Define and document a new driver flag, DPM_FLAG_LEAVE_SUSPENDED, to >> instruct the PM core and middle-layer (bus type, PM domain, etc.) >> code that it is desirable to leave the device in runtime suspend >> after system-wide transitions to the working state (for example, >> the device may be slow to resume and it may be better to avoid >> resuming it right away). >> >> Generally, the middle-layer code involved in the handling of the >> device is expected to indicate to the PM core whether or not the >> device may be left in suspend with the help of the device's >> power.may_skip_resume status bit. That has to happen in the "noirq" >> phase of the preceding system suspend (or analogous) transition. >> The middle layer is then responsible for handling the device as >> appropriate in its "noirq" resume callback which is executed >> regardless of whether or not the device may be left suspended, but >> the other resume callbacks (except for ->complete) will be skipped >> automatically by the core if the device really can be left in >> suspend. >> >> The additional power.must_resume status bit introduced for the >> implementation of this mechanisn is used internally by the PM core >> to track the requirement to resume the device (which may depend on >> its children etc). >> >> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> >> Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
