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2013-04-08cpufreq / intel_pstate: Set timer timeout correctlyDirk Brandewie
The current calculation of the delay time is wrong and a cut and paste error from a previous experimental driver. This can result in the timeout being set to jiffies + 1 which setup the driver to race with itself if the APIC timer interrupt happens at just the right time. References: https://bugzilla.redhat.com/show_bug.cgi?id=920289 Reported-by: Adam Williamson <awilliam@redhat.com> Reported-and-tested-by: Parag Warudkar <parag.lkml@gmail.com> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-04-02cpufreq: Correct header guards typoBorislav Petkov
It should be "governor". Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-04-02cpufreq: check OF node /cpus presence before dereferencing itPaolo Pisati
Check for the presence of the '/cpus' OF node before dereferencing it blindly: [ 4.181793] Unable to handle kernel NULL pointer dereference at virtual address 0000001c [ 4.181793] pgd = c0004000 [ 4.181823] [0000001c] *pgd=00000000 [ 4.181823] Internal error: Oops: 5 [#1] SMP ARM [ 4.181823] Modules linked in: [ 4.181823] CPU: 1 Tainted: G W (3.8.0-15-generic #25~hbankD) [ 4.181854] PC is at of_get_next_child+0x64/0x70 [ 4.181854] LR is at of_get_next_child+0x24/0x70 [ 4.181854] pc : [<c04fda18>] lr : [<c04fd9d8>] psr: 60000113 [ 4.181854] sp : ed891ec0 ip : ed891ec0 fp : ed891ed4 [ 4.181884] r10: c04dafd0 r9 : c098690c r8 : c0936208 [ 4.181884] r7 : ed890000 r6 : c0a63d00 r5 : 00000000 r4 : 00000000 [ 4.181884] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : c0b2acc8 [ 4.181884] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel [ 4.181884] Control: 10c5387d Table: adcb804a DAC: 00000015 [ 4.181915] Process swapper/0 (pid: 1, stack limit = 0xed890238) [ 4.181915] Stack: (0xed891ec0 to 0xed892000) [ 4.181915] 1ec0: c09b7b70 00000007 ed891efc ed891ed8 c04daff4 c04fd9c0 00000000 c09b7b70 [ 4.181915] 1ee0: 00000007 c0a63d00 ed890000 c0936208 ed891f54 ed891f00 c00088e0 c04dafdc [ 4.181945] 1f00: ed891f54 ed891f10 c006e940 00000000 00000000 00000007 00000007 c08a4914 [ 4.181945] 1f20: 00000000 c07dbd30 c0a63d00 c09b7b70 00000007 c0a63d00 000000bc c0936208 [ 4.181945] 1f40: c098690c c0986914 ed891f94 ed891f58 c0936a40 c00087bc 00000007 00000007 [ 4.181976] 1f60: c0936208 be8bda20 b6eea010 c0a63d00 c064547c 00000000 00000000 00000000 [ 4.181976] 1f80: 00000000 00000000 ed891fac ed891f98 c0645498 c09368c8 00000000 00000000 [ 4.181976] 1fa0: 00000000 ed891fb0 c0014658 c0645488 00000000 00000000 00000000 00000000 [ 4.182006] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 4.182006] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 [ 4.182037] [<c04fda18>] (of_get_next_child+0x64/0x70) from [<c04daff4>] (cpu0_cpufreq_driver_init+0x24/0x284) [ 4.182067] [<c04daff4>] (cpu0_cpufreq_driver_init+0x24/0x284) from [<c00088e0>] (do_one_initcall+0x130/0x1b0) [ 4.182067] [<c00088e0>] (do_one_initcall+0x130/0x1b0) from [<c0936a40>] (kernel_init_freeable+0x184/0x24c) [ 4.182098] [<c0936a40>] (kernel_init_freeable+0x184/0x24c) from [<c0645498>] (kernel_init+0x1c/0xf4) [ 4.182128] [<c0645498>] (kernel_init+0x1c/0xf4) from [<c0014658>] (ret_from_fork+0x14/0x20) [ 4.182128] Code: f57ff04f e320f004 e89da830 e89da830 (e595001c) [ 4.182128] ---[ end trace 634903a22e8609cb ]--- [ 4.182189] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 4.182189] [ 4.642395] CPU0: stopping [rjw: Changelog] Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25cpufreq: acpi-cpufreq: Don't set policy->related_cpus from .init()Viresh Kumar
With the addition of following patch: fcf8058 cpufreq: Simplify cpufreq_add_dev() cpufreq driver's .init() routine must initialize policy->cpus with mask of all possible CPUs (Online + Offline) that share the clock. Then the core would copy this mask onto policy->related_cpus and will reset policy->cpus to carry only online cpus. acpi-cpufreq driver wasn't updated with this assumption and so sometimes when we try to hot[un]plug CPUs at run time, sysfs directories get corrupted. This patch fixes acpi-cpufreq driver against this corruption. Reported-and-tested-by: Maciej Rutecki <maciej.rutecki@gmail.com> Tested-by: Borislav Petkov <bp@suse.de> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25cpufreq: stats: do cpufreq_cpu_put() corresponding to cpufreq_cpu_get()viresh kumar
In cpufreq_stats_free_sysfs() we aren't balancing calls to cpufreq_cpu_get() with cpufreq_cpu_put(). This will never let us have ref count to policy->kobj as zero. We will get a hang if somehow cpufreq_driver_unregister() is called. And that can happen when we compile our driver as module and insmod/rmmod it. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Amit Kucheria <amit.kucheria@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25intel-pstate: Use #defines instead of hard-coded values.Konrad Rzeszutek Wilk
They are defined in coreboot (MSR_PLATFORM) and the other one is already defined in msr-index.h. Let's use those. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25cpufreq / intel_pstate: Fix calculation of current frequencyDirk Brandewie
Use the correct pstate value to calculate the effective frequency. References: https://bugzilla.redhat.com/show_bug.cgi?id=923942 Reported-by: Satish Balay <balay@fastmail.fm> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-03-25cpufreq / intel_pstate: Add function to check that all MSRs are validDirk Brandewie
Some VMs seem to try to implement some MSRs but not all the registers the driver needs. Check to make sure all the MSR that we need are available. If any of the required MSRs are not available refuse to load. References: https://bugzilla.redhat.com/show_bug.cgi?id=922923 Reported-by: Josh Stone <jistone@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>
2013-03-06cpufreq / intel_pstate: Do not load on VM that does not report max P state.Dirk Brandewie
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>
2013-03-06cpufreq / intel_pstate: Fix intel_pstate_init() error pathDirk Brandewie
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>
2013-03-04cpufreq: highbank: do not initialize array with a loopEmilio López
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>
2013-03-04cpufreq: Fix a typo in commentNamhyung Kim
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>
2013-02-25Merge tag 'pm+acpi-fixes-3.9-rc1' of ↵Linus Torvalds
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
2013-02-23Merge branch 'pm-cpufreq' into fixesRafael J. Wysocki
* pm-cpufreq: imx6q-cpufreq: fix return value check in imx6q_cpufreq_probe() PM / OPP: fix condition for empty of_init_opp_table()
2013-02-23imx6q-cpufreq: fix return value check in imx6q_cpufreq_probe()Wei Yongjun
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>
2013-02-21Merge tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds
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 ...
2013-02-21Merge tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds
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 ...
2013-02-21Merge tag 'driver-core-3.9-rc1' of ↵Linus Torvalds
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() ...
2013-02-17Merge branch 'pm-cpufreq'Rafael J. Wysocki
* pm-cpufreq: cpufreq / intel_pstate: Add kernel command line option disable intel_pstate. cpufreq / intel_pstate: Change to disallow module build
2013-02-15cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.Dirk Brandewie
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>
2013-02-15cpufreq / intel_pstate: Change to disallow module buildDirk Brandewie
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>
2013-02-15Merge branch 'next/cpufreq-exynos' of ↵Rafael J. Wysocki
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
2013-02-15Merge branch 'pm-cpufreq'Rafael J. Wysocki
* 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 ...
2013-02-12Merge tag 'for-arm-soc-cleanup' of ↵Olof Johansson
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>
2013-02-12drivers/db8500-cpufreq: delete dangling includeLinus Walleij
There was a dangling #include <mach/id.h> in the cpufreq file missing from commit 7a4f26097d389c16c9956bc03b81532698d97d64 "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>
2013-02-11cpufreq / intel_pstate: Fix 32 bit buildDirk Brandewie
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>
2013-02-09cpufreq: conservative: Fix typos in commentsStratos Karafotis
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>
2013-02-09cpufreq: ondemand: Fix typos in commentsStratos Karafotis
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>
2013-02-09cpufreq: exynos: simplify .init() for setting policy->cpusViresh Kumar
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>
2013-02-09cpufreq: kirkwood: Add a cpufreq driver for Marvell Kirkwood SoCsAndrew Lunn
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>
2013-02-09cpufreq/x86: Add P-state driver for sandy bridge.Dirk Brandewie
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>
2013-02-09cpufreq_stats: do not remove sysfs files if frequency table is not presentDirk Brandewie
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>
2013-02-09cpufreq: Do not track governor name for scaling drivers with internal governors.Dirk Brandewie
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>
2013-02-09cpufreq: Only call cpufreq_out_of_sync() for driver that implement ↵Dirk Brandewie
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>
2013-02-09cpufreq: Retrieve current frequency from scaling drivers with internal governorsDirk Brandewie
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>
2013-02-09cpufreq: Fix locking issuesViresh Kumar
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>
2013-02-09cpufreq: Create a macro for unlock_policy_rwsem{read,write}Viresh Kumar
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>
2013-02-09cpufreq: Remove unused HOTPLUG_CPU codeViresh Kumar
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>
2013-02-09cpufreq: governors: Fix WARN_ON() for multi-policy platformsViresh Kumar
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>
2013-02-09cpufreq: ondemand: Replace down_differential tuner with adj_up_thresholdStratos Karafotis
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>
2013-02-09cpufreq / stats: Get rid of CPUFREQ_STATDEVICE_ATTRViresh Kumar
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>
2013-02-09cpufreq: Don't check cpu_online(policy->cpu)Viresh Kumar
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>
2013-02-09cpufreq: add imx6q-cpufreq driverShawn Guo
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>
2013-02-05cpufreq: Don't remove sysfs link for policy->cpuViresh Kumar
"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>
2013-02-04Merge branch 'next/cleanup-header' of ↵Olof Johansson
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>
2013-02-04cpufreq: exynos: Fix hang in pm handler due to frequency mismatchJonghwan Choi
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>
2013-02-02cpufreq: Remove unnecessary use of policy->shared_typeViresh Kumar
policy->shared_type field was added only for SoCs with ACPI support: commit 3b2d99429e3386b6e2ac949fc72486509c8bbe36 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>
2013-02-02cpufreq: Set all cpus in policy->cpus for single cluster SoCsViresh Kumar
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>
2013-02-02cpufreq: governors: Reset tunables only for cpufreq_unregister_governor()Viresh Kumar
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>
2013-02-02cpufreq: governors: Remove code redundancy between governorsViresh Kumar
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>
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