Commit Graph

551 Commits

Author SHA1 Message Date
Dirk Brandewie d3929b8328 cpufreq / intel_pstate: Do not load on VM that does not report max P state.
It seems some VMs support the P state MSRs but return zeros. Fail
gracefully if we are running in this environment.

References: https://bugzilla.redhat.com/show_bug.cgi?id=916833
Reported-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-06 23:40:11 +01:00
Dirk Brandewie 907cc90810 cpufreq / intel_pstate: Fix intel_pstate_init() error path
If cpufreq_register_driver() fails just free memory that has been
allocated and return. intel_pstate_exit() function is removed since we
are built-in only now there is no reason for a module exit procedure.

Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-06 23:34:58 +01:00
Emilio López f5f43dcfff cpufreq: highbank: do not initialize array with a loop
As uninitialized array members will be initialized to zero, we can
avoid using a for loop by setting a value to it.

Signed-off-by: Emilio López <emilio@elopez.com.ar>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-By: Mark Langsdorf <mark.langsdorf@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-04 14:23:11 +01:00
Namhyung Kim e5dde92cb2 cpufreq: Fix a typo in comment
Fix a typo in a comment in cpufreq_governor.h.

[rjw: Changelog]
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-04 14:23:11 +01:00
Linus Torvalds c41b3810c0 ACPI and power management fixes for 3.9-rc1
- Fixes for blackfin and microblaze build problems introduced by the
   removal of global pm_idle.  From Lars-Peter Clausen.
 
 - OPP core build fix from Shawn Guo.
 
 - Error condition check fix for the new imx6q-cpufreq driver from
   Wei Yongjun.
 
 - Fix for an AER driver crash related to the lack of APEI
   initialization for acpi=off.  From Rafael J. Wysocki.
 
 - Fix for a USB breakage on Thinkpad T430 related to ACPI power
   resources and PCI wakeup from Rafael J. Wysocki.
 
 /
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Merge tag 'pm+acpi-fixes-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes from Rafael Wysocki:

 - Fixes for blackfin and microblaze build problems introduced by the
   removal of global pm_idle.  From Lars-Peter Clausen.

 - OPP core build fix from Shawn Guo.

 - Error condition check fix for the new imx6q-cpufreq driver from Wei
   Yongjun.

 - Fix for an AER driver crash related to the lack of APEI
   initialization for acpi=off.  From Rafael J Wysocki.

 - Fix for a USB breakage on Thinkpad T430 related to ACPI power
   resources and PCI wakeup from Rafael J.  Wysocki.

* tag 'pm+acpi-fixes-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / PM: Take unusual configurations of power resources into account
  imx6q-cpufreq: fix return value check in imx6q_cpufreq_probe()
  PM / OPP: fix condition for empty of_init_opp_table()
  ACPI / APEI: Fix crash in apei_hest_parse() for acpi=off
  microblaze idle: Fix compile error
  blackfin idle: Fix compile error
2013-02-25 21:25:17 -08:00
Rafael J. Wysocki d3caf89433 Merge branch 'pm-cpufreq' into fixes
* pm-cpufreq:
  imx6q-cpufreq: fix return value check in imx6q_cpufreq_probe()
  PM / OPP: fix condition for empty of_init_opp_table()
2013-02-23 00:41:53 +01:00
Wei Yongjun 3a3656d401 imx6q-cpufreq: fix return value check in imx6q_cpufreq_probe()
In case of error, the function devm_regulator_get() returns
ERR_PTR() and never returns NULL. The NULL test in the return
value check should be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-23 00:30:25 +01:00
Linus Torvalds 5ce7aba976 arm-soc: driver specific changes
* Updates to the ux500 cpufreq code
 * Moving the u300 DMA controller driver to drivers/dma
 * Moving versatile express drivers out of arch/arm for sharing with arch/arm64
 * Device tree bindings for the OMAP General Purpose Memory Controller
 
 There is a simple conflict in drivers/cpufreq/dbx500-cpufreq.c, because
 the mach/id.h header and the cpu_is_u8500_family() function in it are
 now gone.
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Merge tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC driver specific changes from Arnd Bergmann:

 - Updates to the ux500 cpufreq code

 - Moving the u300 DMA controller driver to drivers/dma

 - Moving versatile express drivers out of arch/arm for sharing with arch/arm64

 - Device tree bindings for the OMAP General Purpose Memory Controller

* tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (27 commits)
  ARM: OMAP2+: gpmc: Add device tree documentation for elm handle
  ARM: OMAP2+: gpmc: add DT bindings for OneNAND
  ARM: OMAP2+: gpmc-onenand: drop __init annotation
  mtd: omap-onenand: pass device_node in platform data
  ARM: OMAP2+: Prevent potential crash if GPMC probe fails
  ARM: OMAP2+: gpmc: Remove unneeded of_node_put()
  arm: Move sp810.h to include/linux/amba/
  ARM: OMAP: gpmc: add DT bindings for GPMC timings and NAND
  ARM: OMAP: gpmc: enable hwecc for AM33xx SoCs
  ARM: OMAP: gpmc-nand: drop __init annotation
  mtd: omap-nand: pass device_node in platform data
  ARM: OMAP: gpmc: don't create devices from initcall on DT
  dma: coh901318: cut down on platform data abstraction
  dma: coh901318: merge header files
  dma: coh901318: push definitions into driver
  dma: coh901318: push header down into the DMA subsystem
  dma: coh901318: skip hard-coded addresses
  dma: coh901318: remove hardcoded target addresses
  dma: coh901318: push platform data into driver
  dma: coh901318: create a proper platform data file
  ...
2013-02-21 15:12:18 -08:00
Linus Torvalds b274776c54 arm-soc: cleanups
A large number of cleanups, all over the platforms. This is dominated
 largely by the Samsung platforms (s3c, s5p, exynos) and a few of the
 others moving code out of arch/arm into more appropriate subsystems.
 The clocksource and irqchip drivers are now abstracted to the point
 where platforms that are already cleaned up do not need to even specify
 the driver they use, it can all get configured from the device tree
 as we do for normal device drivers. The clocksource changes basically
 touch every single platform in the process.
 
 We further clean up the use of platform specific header files here,
 with the goal of turning more of the platforms over to being
 "multiplatform" enabled, which implies that they cannot expose
 their headers to architecture independent code any more.
 
 It is expected that no functional changes are part of the cleanup.
 The overall reduction in total code lines is mostly the result of
 removing broken and obsolete code.
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Merge tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC cleanups from Arnd Bergmann:
 "A large number of cleanups, all over the platforms.  This is dominated
  largely by the Samsung platforms (s3c, s5p, exynos) and a few of the
  others moving code out of arch/arm into more appropriate subsystems.

  The clocksource and irqchip drivers are now abstracted to the point
  where platforms that are already cleaned up do not need to even
  specify the driver they use, it can all get configured from the device
  tree as we do for normal device drivers.  The clocksource changes
  basically touch every single platform in the process.

  We further clean up the use of platform specific header files here,
  with the goal of turning more of the platforms over to being
  "multiplatform" enabled, which implies that they cannot expose their
  headers to architecture independent code any more.

  It is expected that no functional changes are part of the cleanup.
  The overall reduction in total code lines is mostly the result of
  removing broken and obsolete code."

* tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (133 commits)
  ARM: mvebu: correct gated clock documentation
  ARM: kirkwood: add missing include for nsa310
  ARM: exynos: move exynos4210-combiner to drivers/irqchip
  mfd: db8500-prcmu: update resource passing
  drivers/db8500-cpufreq: delete dangling include
  ARM: at91: remove NEOCORE 926 board
  sunxi: Cleanup the reset code and add meaningful registers defines
  ARM: S3C24XX: header mach/regs-mem.h local
  ARM: S3C24XX: header mach/regs-power.h local
  ARM: S3C24XX: header mach/regs-s3c2412-mem.h local
  ARM: S3C24XX: Remove plat-s3c24xx directory in arch/arm/
  ARM: S3C24XX: transform s3c2443 subirqs into new structure
  ARM: S3C24XX: modify s3c2443 irq init to initialize all irqs
  ARM: S3C24XX: move s3c2443 irq code to irq.c
  ARM: S3C24XX: transform s3c2416 irqs into new structure
  ARM: S3C24XX: modify s3c2416 irq init to initialize all irqs
  ARM: S3C24XX: move s3c2416 irq init to common irq code
  ARM: S3C24XX: Modify s3c_irq_wake to use the hwirq property
  ARM: S3C24XX: Move irq syscore-ops to irq-pm
  clocksource: always define CLOCKSOURCE_OF_DECLARE
  ...
2013-02-21 14:58:40 -08:00
Linus Torvalds 06991c28f3 Driver core patches for 3.9-rc1
Here is the big driver core merge for 3.9-rc1
 
 There are two major series here, both of which touch lots of drivers all
 over the kernel, and will cause you some merge conflicts:
   - add a new function called devm_ioremap_resource() to properly be
     able to check return values.
   - remove CONFIG_EXPERIMENTAL
 
 If you need me to provide a merged tree to handle these resolutions,
 please let me know.
 
 Other than those patches, there's not much here, some minor fixes and
 updates.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core patches from Greg Kroah-Hartman:
 "Here is the big driver core merge for 3.9-rc1

  There are two major series here, both of which touch lots of drivers
  all over the kernel, and will cause you some merge conflicts:

   - add a new function called devm_ioremap_resource() to properly be
     able to check return values.

   - remove CONFIG_EXPERIMENTAL

  Other than those patches, there's not much here, some minor fixes and
  updates"

Fix up trivial conflicts

* tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (221 commits)
  base: memory: fix soft/hard_offline_page permissions
  drivercore: Fix ordering between deferred_probe and exiting initcalls
  backlight: fix class_find_device() arguments
  TTY: mark tty_get_device call with the proper const values
  driver-core: constify data for class_find_device()
  firmware: Ignore abort check when no user-helper is used
  firmware: Reduce ifdef CONFIG_FW_LOADER_USER_HELPER
  firmware: Make user-mode helper optional
  firmware: Refactoring for splitting user-mode helper code
  Driver core: treat unregistered bus_types as having no devices
  watchdog: Convert to devm_ioremap_resource()
  thermal: Convert to devm_ioremap_resource()
  spi: Convert to devm_ioremap_resource()
  power: Convert to devm_ioremap_resource()
  mtd: Convert to devm_ioremap_resource()
  mmc: Convert to devm_ioremap_resource()
  mfd: Convert to devm_ioremap_resource()
  media: Convert to devm_ioremap_resource()
  iommu: Convert to devm_ioremap_resource()
  drm: Convert to devm_ioremap_resource()
  ...
2013-02-21 12:05:51 -08:00
Rafael J. Wysocki fdbe0946d4 Merge branch 'pm-cpufreq'
* pm-cpufreq:
  cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.
  cpufreq / intel_pstate: Change to disallow module build
2013-02-17 14:38:13 +01:00
Dirk Brandewie 6be2649861 cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.
When intel_pstate is configured into the kernel it will become the
preferred scaling driver for processors that it supports.  Allow the
user to override this by adding:
   intel_pstate=disable
on the kernel command line.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-15 22:55:10 +01:00
Dirk Brandewie da0d9fda37 cpufreq / intel_pstate: Change to disallow module build
Load order is important in order for intel_pstate to take over as the
default scaling driver from acpi-cpufreq.

If both are built-in, acpi-cpufreq uses late_initcall() and
intel_pstate uses device_initcall() so it will be able to register as
the scaling before acpi-cpufreq for the processors supported by
intel_pstate.

If acpi-cpufreq is built as a module then intel_pstate still gets
first option to become the scaling driver.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-15 22:54:59 +01:00
Rafael J. Wysocki 60a406d1de Merge branch 'next/cpufreq-exynos' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung
* 'next/cpufreq-exynos' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  cpufreq: exynos: Fix hang in pm handler due to frequency mismatch
  cpufreq: exynos: Initialize return variable
  cpufreq: exynos: Fix unsigned variable being checked for negative value
  cpufreq: exynos: Get booting freq value in exynos_cpufreq_init
  cpufreq: exynos: Show list of available frequencies
  cpufreq: exynos: Add missing static
  cpufreq: exynos: Split exynos_target function into two functions
  cpufreq: exynos: Use APLL_FREQ macro for cpu divider value
  cpufreq: exynos: Check old & new frequency early
  cpufreq: exynos: Remove unused variable & IS_ERR
2013-02-15 14:00:15 +01:00
Rafael J. Wysocki 4419fbd4b4 Merge branch 'pm-cpufreq'
* pm-cpufreq: (55 commits)
  cpufreq / intel_pstate: Fix 32 bit build
  cpufreq: conservative: Fix typos in comments
  cpufreq: ondemand: Fix typos in comments
  cpufreq: exynos: simplify .init() for setting policy->cpus
  cpufreq: kirkwood: Add a cpufreq driver for Marvell Kirkwood SoCs
  cpufreq/x86: Add P-state driver for sandy bridge.
  cpufreq_stats: do not remove sysfs files if frequency table is not present
  cpufreq: Do not track governor name for scaling drivers with internal governors.
  cpufreq: Only call cpufreq_out_of_sync() for driver that implement cpufreq_driver.target()
  cpufreq: Retrieve current frequency from scaling drivers with internal governors
  cpufreq: Fix locking issues
  cpufreq: Create a macro for unlock_policy_rwsem{read,write}
  cpufreq: Remove unused HOTPLUG_CPU code
  cpufreq: governors: Fix WARN_ON() for multi-policy platforms
  cpufreq: ondemand: Replace down_differential tuner with adj_up_threshold
  cpufreq / stats: Get rid of CPUFREQ_STATDEVICE_ATTR
  cpufreq: Don't check cpu_online(policy->cpu)
  cpufreq: add imx6q-cpufreq driver
  cpufreq: Don't remove sysfs link for policy->cpu
  cpufreq: Remove unnecessary use of policy->shared_type
  ...
2013-02-15 13:59:07 +01:00
Olof Johansson b22d18c3b4 Two fixes for broken <mach/id.h> cleanup.
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Merge tag 'for-arm-soc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-stericsson into next/cleanup

From Linus Walleij:
Two fixes for broken <mach/id.h> cleanup.

* tag 'for-arm-soc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-stericsson:
  mfd: db8500-prcmu: update resource passing
  drivers/db8500-cpufreq: delete dangling include

Signed-off-by: Olof Johansson <olof@lixom.net>
2013-02-12 15:00:14 -08:00
Linus Walleij f25610ce53 drivers/db8500-cpufreq: delete dangling include
There was a dangling #include <mach/id.h> in the cpufreq
file missing from commit
7a4f26097d
"ARM: ux500: de-globalize <mach/id.h>"

Causing build regressions when building with cpufreq
support.

Cc: arm@kernel.org
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-02-12 12:44:22 +01:00
Dirk Brandewie 191e5edf96 cpufreq / intel_pstate: Fix 32 bit build
Fixes 32 bit build.

on i386:
drivers/built-in.o: In function `intel_pstate_timer_func':
intel_pstate.c:(.text+0x4ce97e): undefined reference to `__udivdi3'
drivers/built-in.o: In function `intel_pstate_cpu_init':
intel_pstate.c:(.cpuinit.text+0x974): undefined reference to `__udivdi3'

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-11 20:33:34 +01:00
Stratos Karafotis c88883cd54 cpufreq: conservative: Fix typos in comments
Fix a couple of typos in comments.

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:56:19 +01:00
Stratos Karafotis 06eb09d17c cpufreq: ondemand: Fix typos in comments
Fix some typos in comments.

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:56:19 +01:00
Viresh Kumar 6ca939b3a3 cpufreq: exynos: simplify .init() for setting policy->cpus
With the recent changes in cpufreq core, we just need to set mask of all
possible cpus into policy->cpus. Rest would be done by core.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:56:13 +01:00
Andrew Lunn 2a4bd9f0db cpufreq: kirkwood: Add a cpufreq driver for Marvell Kirkwood SoCs
The Marvell Kirkwood SoCs have simple cpufreq support in hardware. The
CPU can either use the a high speed cpu clock, or the slower DDR
clock. Add a driver to swap between these two clock sources.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:56:08 +01:00
Dirk Brandewie 93f0822dff cpufreq/x86: Add P-state driver for sandy bridge.
Add a P-state driver for the Intel Sandy bridge processor. In cpufreq
terminology this driver implements a  scaling driver with an internal
governor.

When built into the the kernel this driver will be the preferred
scaling driver for Sandy bridge processors.

In addition to the interfaces provided by the cpufreq subsystem for
controlling scaling drivers. The user may control the behavior of the
driver via three sysfs files located in
"/sys/devices/system/cpu/intel_pstate".

  max_perf_pct: limits the maximum P state that will be requested by
  the driver stated as a percentage of the avail performance.

  min_perf_pct: limits the minimum P state that will be  requested by
  the driver stated as a percentage of the avail performance.

  no_turbo: limits the driver to selecting P states below the turbo
  frequency range.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:56:04 +01:00
Dirk Brandewie 633d47d653 cpufreq_stats: do not remove sysfs files if frequency table is not present
The sysfs files for cpufreq_stats are created in cpufreq_stats_create_table()
called from cpufreq_stat_notifier_policy() when a policy is added to
the cpu. cpufreq_stats_create_table() will not be called if the
scaling driver does not export a frequency table to cpufreq.  Use the
same fence on tear down.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:55:59 +01:00
Dirk Brandewie fa69e33f7d cpufreq: Do not track governor name for scaling drivers with internal governors.
Scaling drivers that implement internal governors do not have governor
structures assocaited with them.  Only track the name of the governor
associated with the CPU if the driver does not implement
cpufreq_driver.setpolicy()

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:55:53 +01:00
Dirk Brandewie f6b0515b07 cpufreq: Only call cpufreq_out_of_sync() for driver that implement cpufreq_driver.target()
Scaling drivers that implement cpufreq_driver.setpolicy() have
internal governors that do not signal changes via
cpufreq_notify_transition() so the frequncy in the policy will almost
certainly be different than the current frequncy.  Only call
cpufreq_out_of_sync() when the underlying driver implements
cpufreq_driver.target()

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:55:47 +01:00
Dirk Brandewie 9e21ba8bd8 cpufreq: Retrieve current frequency from scaling drivers with internal governors
Scaling drivers that implement the cpufreq_driver.setpolicy() versus
the cpufreq_driver.target() interface do not set policy->cur.

Normally policy->cur is set during the call to cpufreq_driver.target()
when the frequnecy request is made by the governor.

If the scaling driver implements cpufreq_driver.setpolicy() and
cpufreq_driver.get() interfaces use cpufreq_driver.get() to retrieve
the current frequency.

Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 12:55:03 +01:00
Viresh Kumar 2eaa3e2df1 cpufreq: Fix locking issues
cpufreq core uses two locks:
- cpufreq_driver_lock: General lock for driver and cpufreq_cpu_data array.
- cpu_policy_rwsemfix locking: per CPU reader-writer semaphore designed to cure
  all cpufreq/hotplug/workqueue/etc related lock issues.

These locks were not used properly and are placed against their principle
(present before their definition) at various places. This patch is an attempt to
fix their use.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:22:57 +01:00
Viresh Kumar fa1d8af47f cpufreq: Create a macro for unlock_policy_rwsem{read,write}
On the lines of macro: lock_policy_rwsem, we can create another macro for
unlock_policy_rwsem. Lets do it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:22:06 +01:00
Viresh Kumar 65922465b5 cpufreq: Remove unused HOTPLUG_CPU code
Because the sibling cpu of any online cpu is identified very early in
cpufreq_add_dev(), below code is never executed. And so can be removed.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:21:37 +01:00
Viresh Kumar 8e53695f7f cpufreq: governors: Fix WARN_ON() for multi-policy platforms
On multi-policy systems there is a single instance of governor for both the
policies (if same governor is chosen for both policies). With the code update
from following patches:

8eeed09 cpufreq: governors: Get rid of dbs_data->enable field
b394058 cpufreq: governors: Reset tunables only for cpufreq_unregister_governor()

We are creating/removing sysfs directory of governor for for every call to
GOV_START and STOP. This would fail for multi-policy system as there is a
per-policy call to START/STOP.

This patch reuses the governor->initialized variable to detect total users of
governor.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:21:13 +01:00
Stratos Karafotis 4bd4e42819 cpufreq: ondemand: Replace down_differential tuner with adj_up_threshold
In order to avoid the calculation of up_threshold - down_differential
every time that the frequency must be decreased, we replace the
down_differential tuner with the adj_up_threshold which keeps the
difference across multiple checks.

Update the adj_up_threshold only when the up_theshold is also updated.

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:18:47 +01:00
Viresh Kumar df18e504aa cpufreq / stats: Get rid of CPUFREQ_STATDEVICE_ATTR
Macro "CPUFREQ_STATDEVICE_ATTR" is defined local to cpufreq_stats.c file and is
almost a copy of the generic version present in cpufreq.h file. Lets use the
generic version instead.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:18:40 +01:00
Viresh Kumar 3361b7b173 cpufreq: Don't check cpu_online(policy->cpu)
policy->cpu or cpus in policy->cpus can't be offline anymore. And so we don't
need to check if they are online or not.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:18:34 +01:00
Shawn Guo 1dd538f072 cpufreq: add imx6q-cpufreq driver
Add an imx6q-cpufreq driver for Freescale i.MX6Q SoC to handle the
hardware specific frequency and voltage scaling requirements.

The driver supports module build and is instantiated by the platform
device/driver mechanism, so that it will not be instantiated on other
platforms, as IMX is built with multiplatform support.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-09 01:18:13 +01:00
Viresh Kumar 73bf0fc2b0 cpufreq: Don't remove sysfs link for policy->cpu
"cpufreq" directory in policy->cpu is never created using
sysfs_create_link(), but using kobject_init_and_add(). And so we
shouldn't call sysfs_remove_link() for policy->cpu().  sysfs stuff
for policy->cpu is automatically removed when we call kobject_put()
for dying policy.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-05 22:21:14 +01:00
Olof Johansson 5b399db0b7 Merge branch 'next/cleanup-header' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/cleanup
From Kukjin Kim:
AS I commented, this makes <mach/*.h> local so that they could be removed.

* 'next/cleanup-header' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung: (26 commits)
  ARM: S3C64XX: Fix missing header error with CONFIG_CPU_IDLE enabled
  ARM: S3C64XX: make regs-syscon-power.h local
  ARM: S3C64XX: make regs-sys.h local
  ARM: S3C64XX: make regs-srom.h local
  ARM: S3C64XX: make regs-modem.h local
  ARM: S3C64XX: make regs-gpio-memport.h local
  ARM: S3C64XX: make crag6410.h local
  ARM: S3C24XX: remove dsc.c and make regs-dsc.h local
  ARM: S3C24XX: remove idle.h
  ARM: S3C2412: cleanup regs-s3c2412.h
  ARM: S3C2416: remove regs-s3c2416-mem.h and regs-s3c2416.h
  ARM: S3C24XX: make vr1000-cpld.h, vr1000-irq.h and vr1000-map.h local
  ARM: S3C24XX: make otom-map.h local
  ARM: S3C24XX: make osiris-cpld.h and osiris-map.h local
  ARM: S3C24XX: make h1940.h and h1940-latch.h local
  ARM: S3C24XX: make gta02.h local
  ARM: S3C24XX: make bast-cpld.h, bast-irq.h and bast-map.h local
  ARM: S3C24XX: make anubis-cpld, anubis-irq and anubis-map local
  ARM: SAMSUNG: cleanup mach/gpio-fns.h gpio-track.h and gpio-nrs.h
  ARM: SAMSUNG: cleanup mach/regs-audss.h file
  ...

Signed-off-by: Olof Johansson <olof@lixom.net>
2013-02-04 21:49:29 -08:00
Jonghwan Choi c098ea74b2 cpufreq: exynos: Fix hang in pm handler due to frequency mismatch
When pm handler set freq & voltage, frequency mismatch occurred.
Because freqs.new isn't set in pm handler.

Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-02-04 21:01:22 -08:00
Viresh Kumar 62b36cc1c8 cpufreq: Remove unnecessary use of policy->shared_type
policy->shared_type field was added only for SoCs with ACPI support:

commit 3b2d99429e
Author: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Date:   Wed Dec 14 15:05:00 2005 -0500

    P-state software coordination for ACPI core

    http://bugzilla.kernel.org/show_bug.cgi?id=5737

Many non-ACPI systems are filling this field by mistake, which makes its usage
confusing. Lets clean it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 01:29:32 +01:00
Viresh Kumar 4c738d00cf cpufreq: Set all cpus in policy->cpus for single cluster SoCs
With following patch, we need to set policy->cpus with mask of all possible cpus
and policy->related_cpus would be filled automatically by the core.

commit 4948b355e90080cd5ec1e91189f65a01e4186ef2
Author: Viresh Kumar <viresh.kumar@linaro.org>
Date:   Tue Jan 29 14:39:08 2013 +0000

cpufreq: Simplify cpufreq_add_dev()

Lets fix it for all single cluster SoCs.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 01:29:31 +01:00
Viresh Kumar b394058f06 cpufreq: governors: Reset tunables only for cpufreq_unregister_governor()
Currently, whenever governor->governor() is called for CPUFRREQ_GOV_START event
we reset few tunables of governor. Which isn't correct, as this routine is
called for every cpu hot-[un]plugging event. We should actually be resetting
these only when the governor module is removed and re-installed.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 01:29:31 +01:00
Viresh Kumar 4447266b84 cpufreq: governors: Remove code redundancy between governors
With the inclusion of following patches:

9f4eb10 cpufreq: conservative: call dbs_check_cpu only when necessary
772b4b1 cpufreq: ondemand: call dbs_check_cpu only when necessary

code redundancy between the conservative and ondemand governors is
introduced again, so get rid of it.

[rjw: Changelog]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 01:02:44 +01:00
Viresh Kumar 8eeed09566 cpufreq: governors: Get rid of dbs_data->enable field
CPUFREQ_GOV_START/STOP are called only once for all policy->cpus and hence we
don't need to adapt cpufreq_governor_dbs() routine for multiple calls.

So, this patch removes dbs_data->enable field entirely. And rearrange code a
bit.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Fabio Baltieri 09dca5ae75 cpufreq: governors: fix misuse of cdbs.cpu
Fix governors code to set all cpu's cdbs->cpu to the the actual cpu id
and use cur_policy->cpu istead of cdbs->cpu to track current governor's
leader cpu.

Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Fabio Baltieri 2624f90c16 cpufreq: governors: implement generic policy_is_shared
Implement a generic helper function policy_is_shared() to replace the
current dbs_sw_coordinated_cpus() at cpufreq level, so that it can be
used by code other than cpufreq governors.

Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Viresh Kumar 6f35a65fbb cpufreq: SPEAr: Notify all policy->cpus of frequency change
SPEAr cpufreq driver supports dual core Cortex-A9 SoC's, where cpus share policy
structure. Whenever we update frequency of a cpu, we must notify all
policy->cpus.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Shawn Guo 5553f9e26f cpufreq: instantiate cpufreq-cpu0 as a platform_driver
As multiplatform build is being adopted by more and more ARM platforms,
initcall function should be used very carefully.  For example, when
GENERIC_CPUFREQ_CPU0 is built in the kernel, cpu0_cpufreq_driver_init()
will be called on all the platforms to initialize cpufreq-cpu0 driver.

To eliminate this undesired the effect, the patch changes cpufreq-cpu0
driver to have it instantiated as a platform_driver.  Then it will only
run on platforms that create the platform_device "cpufreq-cpu0".

Along with the change, it also changes cpu_dev to be &pdev->dev,
so that managed functions can start working, and module build gets
supported too.

The highbank-cpufreq driver is also updated accordingly to adapt the
changes on cpufreq-cpu0.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Fabio Baltieri 58ddcead4f cpufreq: governors: clean timer init and exit code
Drop unused arguments from dbs_timer_init and clean dbs_timer_exit and
cpufreq_governor_dbs to remove non necessary special cases.

Reported-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Viresh Kumar fcf8058296 cpufreq: Simplify cpufreq_add_dev()
Currently cpufreq_add_dev() firsts allocates policy, calls
driver->init() and then checks if this CPU is already managed or not.
And if it is already managed, its policy is freed.

We can save all this if we somehow know that CPU is managed or not in
advance.  policy->related_cpus contains the list of all valid sibling
CPUs of policy->cpu. We can check this to see if the current CPU is
already managed.

From now on, platforms don't really need to set related_cpus from
their init() routines, as the same work is done by core too.

If a platform driver needs to set the related_cpus mask with some
additional CPUs, other than CPUs present in policy->cpus, they are
free to do it, though, as we don't override anything.

[rjw: Changelog]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00
Viresh Kumar b26f72042e cpufreq: Revert "cpufreq: Don't use cpu removed during cpufreq_driver_unregister"
This reverts commit 956f339 "cpufreq: Don't use cpu removed during
cpufreq_driver_unregister".

With the addition of the following commit, this change/variable is not
required any more:

commit b9ba2725343ae57add3f324dfa5074167f48de96
Author: Viresh Kumar <viresh.kumar@linaro.org>
Date:   Mon Jan 14 13:23:03 2013 +0000

    cpufreq: Simplify __cpufreq_remove_dev()

[rjw: Subject and changelog]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-02-02 00:01:16 +01:00