Tomeu Vizoso <[email protected]> writes: > Introduce a new per-device flag power.force_direct_complete that will > instruct the PM core to let that device remain in runtime suspend when > the system goes into a sleep power state, regardless of the PM state of > any of its descendants. > > This is needed because otherwise it would be needed to get dozens of > drivers to implement the prepare() callback and be runtime PM active > even if they don't have a 1-to-1 relationship with a piece of HW. > > This only applies to devices that aren't wakeup-capable, as those would > need to setup their IRQs as wakeup-capable in their prepare() callbacks. > > Signed-off-by: Tomeu Vizoso <[email protected]> > --- > > Hi, > > I'm sending this as a standalone patch as suggested by Alan. > > Thanks, > > Tomeu > > --- > Documentation/power/runtime_pm.txt | 10 ++++++++++ > drivers/base/power/main.c | 14 ++++++++++---- > include/linux/pm.h | 1 + > 3 files changed, 21 insertions(+), 4 deletions(-) > > diff --git a/Documentation/power/runtime_pm.txt > b/Documentation/power/runtime_pm.txt > index 44fe1d2..3b0c68d 100644 > --- a/Documentation/power/runtime_pm.txt > +++ b/Documentation/power/runtime_pm.txt > @@ -665,6 +665,16 @@ as appropriate. This only applies to system suspend > transitions that are not > related to hibernation (see Documentation/power/devices.txt for more > information). > > +For devices that know that can remain runtime suspended when the system
s/that know that/that know they/ ? > +transitions to a sleep state regardless of the PM state of their descendants, > +the flag power.force_direct_complete can be set on their device structures. > +This can be useful when a real device has several virtual devices as > +descendants and it would be very cumbersome to make sure that they return a > +positive value in their .prepare() callback and have runtime PM enabled. > Usage > +of power.force_direct_complete is only allowed to devices that aren't > +wakeup-capable, as they would need to set their IRQs as wakeups in their > +.prepare() callbacks before the system transitions to a sleep state. Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
