linux-kernel - [PATCH v4 0/3] devfreq: Add support for devices which can idle

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Message-Id: <1349342914-7095-1-git-send-email-rajagopal.venkat@linaro.org>
Date:	Thu,  4 Oct 2012 14:58:31 +0530
From:	Rajagopal Venkat <rajagopal.venkat@...aro.org>
To:	myungjoo.ham@...sung.com, mturquette@...aro.org,
	kyungmin.park@...sung.com, rjw@...k.pl
Cc:	patches@...aro.org, linaro-dev@...ts.linaro.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rajagopal Venkat <rajagopal.venkat@...aro.org>
Subject: [PATCH v4 0/3] devfreq: Add support for devices which can idle

This patchset updates devfreq core to add support for devices
which can idle. When device idleness is detected perhaps
through runtime-pm, need some mechanism to suspend devfreq
load monitoring and resume when device is back online.

patch 1 introduce core design changes - per device work, decouple
delayed work from core and event based interaction.
patch 2 add devfreq suspend and resume apis.
patch 3 add new sysfs attribute for governor predicted next target
frequency and callback for current device frequency.

The existing devfreq apis are kept intact. Two new apis
devfreq_suspend_device() and devfreq_resume_device() are
added to support suspend/resume of device devfreq.

Changes since v1:
- revised locking mechanism
- added kerneldoc comments for load monitoring helper functions
- fixed minor review comments

Changes since v2:
- added new helper function for polling interval update
- handled work suspend/resume contention between devfreq driver
and sysfs

Changes since v3:
- added additonal checks in suspend/resume to avoid invalid usage of apis
- added check in devfreq_monitor_start, not to start monitoring when
polling_ms is set to zero.

--
Rajagopal Venkat (3):
  devfreq: Core updates to support devices which can idle
  devfreq: Add suspend and resume apis
  devfreq: Add current freq callback in device profile

 Documentation/ABI/testing/sysfs-class-devfreq |  15 +-
 drivers/devfreq/devfreq.c                     | 481 ++++++++++++--------------
 drivers/devfreq/governor.h                    |  13 +
 drivers/devfreq/governor_performance.c        |  16 +-
 drivers/devfreq/governor_powersave.c          |  16 +-
 drivers/devfreq/governor_simpleondemand.c     |  33 ++
 drivers/devfreq/governor_userspace.c          |  23 +-
 include/linux/devfreq.h                       |  49 +--
 8 files changed, 353 insertions(+), 293 deletions(-)

-- 
1.7.11.3

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