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[PATCH v7 0/2] Allow USB devices to remain runtime-suspended when sleeping

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Hi,

this is v7 of an attempt to make it easier for devices to remain in
runtime PM when the system goes to sleep, mainly to reduce the time
spent resuming devices.

For this, we interpret the absence of all PM callback implementations as
it being safe to do direct_complete, so their ancestors aren't prevented
from remaining runtime-suspended.

Additionally, the prepare() callback of USB devices will return 1 if
runtime PM is enabled and the current wakeup settings are correct.

With these changes, a uvcvideo device (for example) stays in runtime
suspend when the system goes to sleep and is left in that state when the
system resumes, not delaying it unnecessarily.

Thanks,

Tomeu

Changes in v7:
- Reduce indentation by adding a label in device_prepare()

Changes in v6:
- Add stub for !CONFIG_PM.
- Move implementation of device_check_pm_callbacks to power/main.c as it
  doesn't belong to CONFIG_PM_SLEEP.
- Take dev->power.lock before modifying flag.

Changes in v5:
- Check for all dev_pm_ops instances associated to a device, updating a
  no_pm_callbacks flag at the times when that could change.

Tomeu Vizoso (2):
  PM / sleep: Go direct_complete if driver has no callbacks
  USB / PM: Allow USB devices to remain runtime-suspended when sleeping

 drivers/base/dd.c           |  3 +++
 drivers/base/power/common.c | 27 +++++++++++++++++++++++++++
 drivers/base/power/domain.c |  5 +++++
 drivers/base/power/main.c   |  8 ++++++++
 drivers/base/power/power.h  |  6 ++++++
 drivers/usb/core/port.c     |  6 ++++++
 drivers/usb/core/usb.c      | 11 ++++++++++-
 include/linux/pm.h          |  1 +
 8 files changed, 66 insertions(+), 1 deletion(-)

-- 
2.4.3

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[PATCH v7 0/2] Allow USB devices to remain runtime-suspended when sleeping Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-30 12:00 +0200
  [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-30 12:00 +0200
    Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks Ulf Hansson <ulf.hansson@linaro.org> - 2015-09-30 13:40 +0200
      Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-09-30 14:40 +0200
        Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks Ulf Hansson <ulf.hansson@linaro.org> - 2015-09-30 15:30 +0200
        Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-30 16:10 +0200
          Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-09-30 22:50 +0200
            Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks Ulf Hansson <ulf.hansson@linaro.org> - 2015-10-01 11:10 +0200
              Re: [PATCH v7 1/2] PM / sleep: Go direct_complete if driver has no callbacks "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-10-02 00:00 +0200
  [PATCH v7 2/2] USB / PM: Allow USB devices to remain runtime-suspended when sleeping Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-09-30 12:00 +0200

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