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  1. 03 Sep, 2012 12 commits
    • Rafael J. Wysocki's avatar
      sh: TMU: Basic runtime PM support · 61a53bfa
      Rafael J. Wysocki authored 
      Modify the SH TMU clock source/clock event device driver to support
runtime PM at a basic level (i.e. device clocks can be disabled and
enabled, but domain power must be on, because the devices have to
be marked as "irq safe").
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
      61a53bfa
    • Rafael J. Wysocki's avatar
      PM / Domains: Do not measure start time for "irq safe" devices · e2e3e4e5
      Rafael J. Wysocki authored 
      The genpd_start_dev() routine used by pm_genpd_runtime_resume()
to put "irq safe" devices into the full power state measures the
time necessary to "start" the device and updates its PM QoS timing
data if necessary.  This may lead to a deadlock if the given device
is a clock source and genpd_start_dev() is invoked from within the
clock source's .enable() routine, which will happen if that routine
uses pm_runtime_get_sync(), for example, to ensure that the device
is operational.

For this reason, introduce a special routine analogous to
genpd_start_dev(), called genpd_start_dev_no_timing(), that doesn't
carry out the time measurement, and make pm_genpd_runtime_resume()
use it instead of genpd_start_dev() to power up "irq safe" devices.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      e2e3e4e5
    • Rafael J. Wysocki's avatar
      PM / Domains: Move syscore flag from subsys data to struct device · dbf37414
      Rafael J. Wysocki authored 
      The syscore device PM flag is used to mark the devices (belonging to
a PM domain) that should never be turned off, except for the system
core (syscore) suspend/hibernation and resume stages.  That flag is
stored in the device's struct pm_subsys_data object whose address is
available from struct device.  However, in some situations it may be
convenient to set that flag before the device is added to a PM
domain, so it is better to move it directly to the "power" member of
struct device.  Then, it can be checked by the routines in
drivers/base/power/runtime.c and drivers/base/power/main.c, which is
more straightforward.

This also reduces the number of dev_gpd_data() invocations in the
generic PM domains framework, so the overhead related to the syscore
flag is slightly smaller.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
      dbf37414
    • Rafael J. Wysocki's avatar
      PM / Domains: Rename the always_on device flag to syscore · 6fb28bad
      Rafael J. Wysocki authored 
      The always_on device flag is used to mark the devices (belonging to
a PM domain) that should never be turned off, except for the system
core (syscore) suspend/hibernation and resume stages.  Change name
of that flag to "syscore" to better reflect its purpose.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
      6fb28bad
    • Rafael J. Wysocki's avatar
      PM / Runtime: Allow helpers to be called by early platform drivers · bed2b42d
      Rafael J. Wysocki authored 
      Runtime PM helper functions, like pm_runtime_get_sync(), cannot be
called by early platform device drivers, because the devices' power
management locks are not initialized at that time.  This is quite
inconvenient, so modify early_platform_add_devices() to initialize
the devices power management locks as appropriate and make sure that
they won't be initialized more than once if an early platform
device is going to be used as a regular one later.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      bed2b42d
    • Rafael J. Wysocki's avatar
      PM: Reorganize device PM initialization · e91c11b1
      Rafael J. Wysocki authored 
      Make the device power management initialization more straightforward
by moving the initialization of common (i.e. used by both runtime PM
and system suspend) fields to a separate routine.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      e91c11b1
    • Rafael J. Wysocki's avatar
      sh: MTU2: Introduce clock events suspend/resume routines · cc7ad456
      Rafael J. Wysocki authored 
      Introduce suspend/resume routines for SH MTU2 clock event devices
such that if those devices belong to a PM domain, the generic PM
domains framework will be notified that the given domain may be
turned off (during system suspend) or that it has to be turned on
(during system resume).
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
      cc7ad456
    • Rafael J. Wysocki's avatar
      sh: CMT: Introduce clocksource/clock events suspend/resume routines · 9bb5ec88
      Rafael J. Wysocki authored 
      Introduce suspend/resume routines for SH CMT clock event devices and
modify the suspend/resume routines for SH CMT clock sources such that
if those devices belong to a PM domain, the generic PM domains
framework will be notified that the given domain may be turned off
(during system suspend) or that it has to be turned on (during system
resume).
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
      9bb5ec88
    • Rafael J. Wysocki's avatar
      sh: TMU: Introduce clocksource/clock events suspend/resume routines · eaa49a8c
      Rafael J. Wysocki authored 
      Introduce suspend/resume routines for SH TMU clock source and
clock event device such that if those devices belong to a PM domain,
the generic PM domains framework will be notified that the given
domain may be turned off (during system suspend) or that it has to
be turned on (during system resume).

This change allows the A4R domain on SH7372 to be turned off during
system suspend (tested on the Mackerel board) if the TMU clock source
and/or clock event device is in use.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarMagnus Damm <damm@opensource.se>
      eaa49a8c
    • Rafael J. Wysocki's avatar
      timekeeping: Add suspend and resume of clock event devices · adc78e6b
      Rafael J. Wysocki authored 
      Some clock event devices, for example such that belong to PM domains,
need to be handled in a spcial way during the timekeeping suspend
and resume (which takes place in the system core, or "syscore",
stages of system power transitions) in analogy with clock sources.

Introduce .suspend() and .resume() callbacks for clock event devices
that will be executed by timekeeping_suspend/_resume(), respectively,
next the the clock sources' .suspend() and .resume() callbacks.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      adc78e6b
    • Rafael J. Wysocki's avatar
      PM / Domains: Add power off/on function for system core suspend stage · 77f827de
      Rafael J. Wysocki authored 
      Introduce function pm_genpd_syscore_switch() and two wrappers around
it, pm_genpd_syscore_poweroff() and pm_genpd_syscore_poweron(),
allowing the callers to let the generic PM domains framework know
that the given device is not necessary any more and its PM domain
can be turned off (the former) or that the given device will be
required immediately, so its PM domain has to be turned on (the
latter) during the system core (syscore) stage of system suspend
(or hibernation) and resume.

These functions will be used for handling devices registered as
clock sources and clock event devices that belong to PM domains.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      77f827de
    • Rafael J. Wysocki's avatar
      PM / Domains: Introduce simplified power on routine for system resume · 802d8b49
      Rafael J. Wysocki authored 
      Introduce function pm_genpd_sync_poweron() for restoring domain power
during resume from system suspend and hibernation.  It can be much
simpler than pm_genpd_poweron(), because it doesn't have to care
about locking and it can skip many checks done by the latter.

Modify pm_genpd_resume_noirq() and pm_genpd_restore_noirq() to use
the new function.
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      802d8b49
  3. 01 Sep, 2012 5 commits
  5. 30 Aug, 2012 5 commits
  7. 29 Aug, 2012 18 commits
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