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  1. 02 Jul, 2011 9 commits
    • Rafael J. Wysocki's avatar
      PM / Domains: Wakeup devices support for system sleep transitions · d4f2d87a
      Rafael J. Wysocki authored 
      There is the problem how to handle devices set up to wake up the
system from sleep states during system-wide power transitions.
In some cases, those devices can be turned off entirely, because the
wakeup signals will be generated on their behalf anyway.  In some
other cases, they will generate wakeup signals if their clocks are
stopped, but only if power is not removed from them.  Finally, in
some cases, they can only generate wakeup signals if power is not
removed from them and their clocks are enabled.

To allow platform-specific code to decide whether or not to put
wakeup devices (and their PM domains) into low-power state during
system-wide transitions, such as system suspend, introduce a new
generic PM domain callback, .active_wakeup(), that will be used
during the "noirq" phase of system suspend and hibernation (after
image creation) to decide what to do with wakeup devices.
Specifically, if this callback is present and returns "true", the
generic PM domain code will not execute .stop_device() for the
given wakeup device and its PM domain won't be powered off.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarKevin Hilman <khilman@ti.com>
      d4f2d87a
    • Rafael J. Wysocki's avatar
      PM / Domains: System-wide transitions support for generic domains (v5) · 596ba34b
      Rafael J. Wysocki authored 
      Make generic PM domains support system-wide power transitions
(system suspend and hibernation).  Add suspend, resume, freeze, thaw,
poweroff and restore callbacks to be associated with struct
generic_pm_domain objects and make pm_genpd_init() use them as
appropriate.

The new callbacks do nothing for devices belonging to power domains
that were powered down at run time (before the transition).  For the
other devices the action carried out depends on the type of the
transition.  During system suspend the power domain .suspend()
callback executes pm_generic_suspend() for the device, while the
PM domain .suspend_noirq() callback runs pm_generic_suspend_noirq()
for it, stops it and eventually removes power from the PM domain it
belongs to (after all devices in the domain have been stopped and its
subdomains have been powered off).

During system resume the PM domain .resume_noirq() callback
restores power to the PM domain (when executed for it first time),
starts the device and executes pm_generic_resume_noirq() for it,
while the .resume() callback executes pm_generic_resume() for the
device.  Finally, the .complete() callback executes pm_runtime_idle()
for the device which should put it back into the suspended state if
its runtime PM usage count is equal to zero at that time.

The actions carried out during hibernation and resume from it are
analogous to the ones described above.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: default avatarKevin Hilman <khilman@ti.com>
      596ba34b
    • Rafael J. Wysocki's avatar
      PM / Domains: Move code from under #ifdef CONFIG_PM_RUNTIME (v2) · 5248051b
      Rafael J. Wysocki authored 
      There is some code in drivers/base/power/domain.c that will be useful
for both runtime PM and system-wide power transitions, so make it
depend on CONFIG_PM instead of CONFIG_PM_RUNTIME.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: default avatarKevin Hilman <khilman@ti.com>
      5248051b
    • Rafael J. Wysocki's avatar
      PM: Introduce generic "noirq" callback routines for subsystems (v2) · e5291928
      Rafael J. Wysocki authored 
      Introduce generic "noirq" power management callback routines for
subsystems in addition to the "regular" generic PM callback routines.

The new routines will be used, among other things, for implementing
system-wide PM transitions support for generic PM domains.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      e5291928
    • Rafael J. Wysocki's avatar
      PM / Domains: Support for generic I/O PM domains (v8) · f721889f
      Rafael J. Wysocki authored 
      Introduce common headers, helper functions and callbacks allowing
platforms to use simple generic power domains for runtime power
management.

Introduce struct generic_pm_domain to be used for representing
power domains that each contain a number of devices and may be
parent domains or subdomains with respect to other power domains.
Among other things, this structure includes callbacks to be
provided by platforms for performing specific tasks related to
power management (i.e. ->stop_device() may disable a device's
clocks, while ->start_device() may enable them, ->power_off() is
supposed to remove power from the entire power domain
and ->power_on() is supposed to restore it).

Introduce functions that can be used as power domain runtime PM
callbacks, pm_genpd_runtime_suspend() and pm_genpd_runtime_resume(),
as well as helper functions for the initialization of a power
domain represented by a struct generic_power_domain object,
adding a device to or removing a device from it and adding or
removing subdomains.

Introduce configuration option CONFIG_PM_GENERIC_DOMAINS to be
selected by the platforms that want to use the new code.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Reviewed-by: default avatarKevin Hilman <khilman@ti.com>
      f721889f
    • Rafael J. Wysocki's avatar
      PM: subsys_data in struct dev_pm_info need not depend on RM_RUNTIME · dc6e4e56
      Rafael J. Wysocki authored 
      The subsys_data field of struct dev_pm_info, introduced by commit
1d2b71f6 (PM / Runtime: Add subsystem
data field to struct dev_pm_info), is going to be used even if
CONFIG_PM_RUNTIME is not set, so move it from under the #ifdef.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      dc6e4e56
    • Rafael J. Wysocki's avatar
      PM / Domains: Rename struct dev_power_domain to struct dev_pm_domain · 564b905a
      Rafael J. Wysocki authored 
      The naming convention used by commit 7538e3db6e015e890825fbd9f86599b
(PM: Add support for device power domains), which introduced the
struct dev_power_domain type for representing device power domains,
evidently confuses some developers who tend to think that objects
of this type must correspond to "power domains" as defined by
hardware, which is not the case.  Namely, at the kernel level, a
struct dev_power_domain object can represent arbitrary set of devices
that are mutually dependent power management-wise and need not belong
to one hardware power domain.  To avoid that confusion, rename struct
dev_power_domain to struct dev_pm_domain and rename the related
pointers in struct device and struct pm_clk_notifier_block from
pwr_domain to pm_domain.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarKevin Hilman <khilman@ti.com>
      564b905a
    • Rafael J. Wysocki's avatar
      PM / Runtime: Update documentation regarding driver removal · f5da24db
      Rafael J. Wysocki authored 
      Commit e1866b33 (PM / Runtime: Rework
runtime PM handling during driver removal) forgot to update the
documentation in Documentation/power/runtime_pm.txt to match the new
code in drivers/base/dd.c.  Update that documentation to match the
code it describes.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: default avatarKevin Hilman <khilman@ti.com>
      f5da24db
    • Kevin Hilman's avatar
      PM: Documentation: fix typo: pm_runtime_idle_sync() doesn't exist. · 5efb54cc
      Kevin Hilman authored 
      Replace reference to pm_runtime_idle_sync() in the driver core with
pm_runtime_put_sync() which is used in the code.
Signed-off-by: default avatarKevin Hilman <khilman@ti.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      5efb54cc
  3. 01 Jul, 2011 4 commits
  5. 30 Jun, 2011 18 commits
  7. 29 Jun, 2011 9 commits
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