linux.git/drivers/base/power, branch v3.18-rc2

Merge branch 'pm-clk'

2014-10-06T23:18:58+00:00

* pm-clk:
  PM / clk: Fix crash in clocks management code if !CONFIG_PM_RUNTIME

Merge branch 'pm-domains'

2014-10-06T23:18:12+00:00

* pm-domains: (32 commits)
  PM / Domains: Rename cpu_data to cpuidle_data
  PM / Domains: Move dev_pm_domain_attach|detach() to pm_domain.h
  PM / Domains: Remove legacy API for adding devices through DT
  PM / Domains: Add genpd attach/detach callbacks
  PM / Domains: add debugfs listing of struct generic_pm_domain-s
  ACPI / PM: Convert acpi_dev_pm_detach() into a static function
  ARM: exynos: Move to generic PM domain DT bindings
  amba: Add support for attach/detach of PM domains
  spi: core: Convert to dev_pm_domain_attach|detach()
  mmc: sdio: Convert to dev_pm_domain_attach|detach()
  i2c: core: Convert to dev_pm_domain_attach|detach()
  drivercore / platform: Convert to dev_pm_domain_attach|detach()
  PM / Domains: Add APIs to attach/detach a PM domain for a device
  PM / Domains: Add generic OF-based PM domain look-up
  ACPI / PM: Assign the ->detach() callback when attaching the PM domain
  PM / Domains: Add a detach callback to the struct dev_pm_domain
  PM / domains: Spelling s/domian/domain/
  PM / domains: Keep declaration of dev_power_governors together
  PM / domains: Remove default_stop_ok() API
  drivers: sh: Leave disabling of unused PM domains to genpd
  ...

PM / clk: Fix crash in clocks management code if !CONFIG_PM_RUNTIME

2014-10-03T13:51:39+00:00

Unlike the clocks management code for runtime PM, the code used for
system suspend does not check the pm_clock_entry.status field.
If pm_clk_acquire() failed, ce->status will be PCE_STATUS_ERROR, and
ce->clk will be a negative error code (e.g. 0xfffffffe = -2 = -ENOENT).

Depending on the clock implementation, suspend or resume may crash with:

    Unable to handle kernel NULL pointer dereference at virtual address 00000026

(CCF clk_disable() has an IS_ERR_OR_NULL() check, while CCF clk_enable()
 only has a NULL check; pre-CCF implementations may behave differently)

While just checking for PCE_STATUS_ERROR would be sufficient, it doesn't
hurt to use the same state machine as is done for runtime PM, as this
makes the two versions more similar, and eligible for a future
consolidation.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Rafael J. Wysocki

PM / Domains: Rename cpu_data to cpuidle_data

2014-10-03T13:43:14+00:00

The "cpu_data" are defined for some archs and thus conflicting with the
"cpu_data" member in the struct gpd_cpu_data. This causes a compiler
error for those archs.

Let's fix it by rename the member to cpuidle_data. In this context it
also seems appropriate to rename the struct to gpd_cpuidle_data to
better reflect its use.

Fixes: f48c767ce895 (PM / Domains: Move dev_pm_domain_attach|detach() to pm_domain.h)
Signed-off-by: Ulf Hansson 
Acked-by: Geert Uytterhoeven 
Acked-by: Pavel Machek 
Signed-off-by: Rafael J. Wysocki

PM / sleep: Export dpm_suspend_late/noirq() and dpm_resume_early/noirq()

2014-09-30T19:05:59+00:00

Subsequent change sets will add platform-related operations between
dpm_suspend_late() and dpm_suspend_noirq() as well as between
dpm_resume_noirq() and dpm_resume_early() in suspend_enter(), so
export these functions for suspend_enter() to be able to call them
separately and split the invocations of dpm_suspend_end() and
dpm_resume_start() in there accordingly.

Signed-off-by: Rafael J. Wysocki

Merge branch 'pm-genirq' into acpi-pm

2014-09-30T18:46:13+00:00

PM / Domains: Remove legacy API for adding devices through DT

2014-09-25T20:13:42+00:00

There are no active clients of the legacy API and we now also have a
better way to handle genpd DT support. So let's remove the legacy API.

Signed-off-by: Ulf Hansson 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Rafael J. Wysocki

PM / Domains: Add genpd attach/detach callbacks

2014-09-25T20:08:41+00:00

While a PM domain can enable PM runtime management of its devices' module
clocks by setting

	genpd->dev_ops.stop = pm_clk_suspend;
	genpd->dev_ops.start = pm_clk_resume;

this also requires registering the clocks with the pm_clk subsystem.
In the legacy case, this is handled by the platform code, after
attaching the device to its PM domain.

When the devices are instantiated from DT, devices are attached to their
PM domains by generic code, leaving no method for the platform-specific
PM domain code to register their clocks.

Add two callbacks, allowing a PM domain to perform platform-specific
tasks when a device is attached to or detached from a PM domain.

Signed-off-by: Geert Uytterhoeven 
Reviewed-by: Ulf Hansson 
Signed-off-by: Rafael J. Wysocki

PM / Domains: add debugfs listing of struct generic_pm_domain-s

2014-09-23T21:16:58+00:00

Add /sys/kernel/debug/pm_genpd/pm_genpd_summary file, which
lists power domains in the system, their statuses and attached devices,
resembling /sys/kernel/debug/clk/clk_summary.

Currently it is impossible to inspect (from userland) whether
a power domain is on or off. And, if it is on, which device blocks it
from powering down. This change allows developers working on
embedded devices power efficiency to list all necessary information
about generic power domains in one place.

The content of pm_genpd/pm_genpd_summary file is generated by iterating
over all generic power domain in the system, and, for each,
over registered devices and over the subdomains, if present.

Example output:
$ cat  /sys/kernel/debug/pm_genpd/pm_genpd_summary
    domain                      status         slaves
           /device                                      runtime status
----------------------------------------------------------------------
a4su                            off
a3sg                            off
a3sm                            on
a3sp                            on
    /devices/e6600000.pwm                               suspended
    /devices/e6c50000.serial                            active
    /devices/e6850000.sd                                suspended
    /devices/e6bd0000.mmc                               active
a4s                             on               a3sp, a3sm, a3sg
    /devices/e6900000.irqpin                            unsupported
    /devices/e6900004.irqpin                            unsupported
    /devices/e6900008.irqpin                            unsupported
    /devices/e690000c.irqpin                            unsupported
    /devices/e9a00000.ethernet                          active
a3rv                            off
a4r                             off              a3rv
    /devices/fff20000.i2c                               suspended
a4lc                            off
c5                              on               a4lc, a4r, a4s, a4su
    /devices/e6050000.pfc                               unsupported
    /devices/e6138000.timer                             active

To enable this feature, compile the kernel with debugfs
and CONFIG_PM_ADVANCED_DEBUG enabled.

Signed-off-by: Maciej Matraszek 
Tested-by: Geert Uytterhoeven 
Signed-off-by: Rafael J. Wysocki

PM / Domains: Add APIs to attach/detach a PM domain for a device

2014-09-22T13:57:40+00:00

To maintain scalability let's add common methods to attach and detach
a PM domain for a device, dev_pm_domain_attach|detach().

Typically dev_pm_domain_attach() shall be invoked from subsystem level
code at the probe phase to try to attach a device to its PM domain.
The reversed actions may be done a the remove phase and then by
invoking dev_pm_domain_detach().

When attachment succeeds, the attach function should assign its
corresponding detach function to a new ->detach() callback added in the
struct dev_pm_domain.

Signed-off-by: Ulf Hansson 
Tested-by: Philipp Zabel 
Reviewed-by: Kevin Hilman 
Reviewed-by: Dmitry Torokhov 
Signed-off-by: Rafael J. Wysocki