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Conflicts:
drivers/platform/x86/eeepc-laptop.c
Signed-off-by: Len Brown <len.brown@intel.com>
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'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release
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Some BIOS re-use the same processor bus id
in different scope:
\_SB.SCK0.CPU0
\_SB.SCK1.CPU0
But the (deprecated) /proc/acpi/ interface
assumes the bus-id's are unique, resulting in an OOPS
when the processor driver is loaded:
WARNING: at fs/proc/generic.c:590 proc_register+0x148/0x180()
Hardware name: Sunrise Ridge
proc_dir_entry 'processor/CPU0' already registered
Call Trace:
[<ffffffff8023f7ef>] warn_slowpath+0xb1/0xe5
[<ffffffff8036243b>] ? ida_get_new_above+0x190/0x1b1
[<ffffffff803625a8>] ? idr_pre_get+0x5f/0x75
[<ffffffff8030b2f6>] proc_register+0x148/0x180
[<ffffffff8030b4ff>] proc_mkdir_mode+0x3d/0x52
[<ffffffff8030b525>] proc_mkdir+0x11/0x13
[<ffffffffa0014b89>] acpi_processor_start+0x755/0x9bc [processor]
Rename the processor device bus id. And the new bus id will be
generated as the following format:
CPU+ CPU ID
For example: If the cpu ID is 5, then the bus ID will be "CPU5".
If the CPU ID is 10, then the bus ID will be "CPUA".
Yes, this will change the directory names seen
in /proc/acpi/processor/* on some systems.
Before this patch, those directory names where
totally arbitrary strings based on the interal AML device strings.
http://bugzilla.kernel.org/show_bug.cgi?id=13612
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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http://bugzilla.kernel.org/show_bug.cgi?id=13121
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Now that new interface is available,
convert to using it rather than creating a new kernel thread.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Sometimes both acpi video and i915 driver are compiled as modules.
And there exists the strict dependency between the two drivers.
The acpi video bus will be unloaded in course of unloading the i915 driver.
If we unload the acpi video driver, then the kernel oops will be triggered.
Add the reference count to avoid unloading the ACPI video bus twice.
The reference count should be checked before unregistering the acpi video bus.
If the reference count is already zero, it won't unregister it again.
And after the acpi video bus is already unregistered, the reference count
will be set to zero.
http://bugzilla.kernel.org/show_bug.cgi?id=13396
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Linux claims Vista compatibility to the BIOS for a number of
reasons, but this brings hard lockup on some Sony laptops.
Disable Vista compatibility via DMI for these laptops unless
we can figure out what Vista is doing for this platform.
http://bugzilla.kernel.org/show_bug.cgi?id=12904
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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we used to run the hotplug code in keventd_wq.
But when hot removing the ACPI battery device,
power_supply_unregister invokes flush_scheduled_work.
This causes a deadlock. i.e
1. When dock is unplugged, all the hotplug code is run on kevent_wq.
2. the hotplug code removes all the child devices of dock device.
3. removing the child device may invoke flush_scheduled_work
4. flush_scheduled_work waits until all the work on kevent_wq to be
finished, while this will never be true because the hotplug code
is running on keventd_wq...
Introduce a new workqueue for hotplug in this patch.
http://bugzilla.kernel.org/show_bug.cgi?id=13533
Tested-by: Paul Martin <pm@debian.org>
Tested-by: Vojtech Gondzala <vojtech.gondzala@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Create symbol link from backlight class device to ACPI video device.
More and more laptops are shipped with multiple ACPI
video devices, while we export only one of them to userspace.
With this patch applied, we can know which ACPI video device
is used by "cat /sys/class/backlight/acpi_video0/device/path".
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (74 commits)
PCI: make msi_free_irqs() to use msix_mask_irq() instead of open coded write
PCI: Fix the NIU MSI-X problem in a better way
PCI ASPM: remove get_root_port_link
PCI ASPM: cleanup pcie_aspm_sanity_check
PCI ASPM: remove has_switch field
PCI ASPM: cleanup calc_Lx_latency
PCI ASPM: cleanup pcie_aspm_get_cap_device
PCI ASPM: cleanup clkpm checks
PCI ASPM: cleanup __pcie_aspm_check_state_one
PCI ASPM: cleanup initialization
PCI ASPM: cleanup change input argument of aspm functions
PCI ASPM: cleanup misc in struct pcie_link_state
PCI ASPM: cleanup clkpm state in struct pcie_link_state
PCI ASPM: cleanup latency field in struct pcie_link_state
PCI ASPM: cleanup aspm state field in struct pcie_link_state
PCI ASPM: fix typo in struct pcie_link_state
PCI: drivers/pci/slot.c should depend on CONFIG_SYSFS
PCI: remove redundant __msi_set_enable()
PCI PM: consistently use type bool for wake enable variable
x86/ACPI: Correct maximum allowed _CRS returned resources and warn if exceeded
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arch_acpi_processor_cleanup_pdc() in x86 and ia64 results in memory allocated
for _PDC objects that is never freed and will cause memory leak in case of
physical CPU remove and add. Patch fixes the memory leak by freeing the
objects soon after _PDC is evaluated.
Reported-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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We never use the PCI device & function number, so remove it to make
it clear that it's not needed. Many PCI host bridges don't even
appear in config space, so it's meaningless to look at stuff from
_ADR, which doesn't exist in that case.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Reviewed-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Using list_for_each_entry() makes traversing the root list easier.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Reviewed-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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There's no need to search the list to find the acpi_pci_root
structure. We saved it as device->driver_data when we added
the device.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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By looking up the segment & bus number earlier, we don't have to
worry about cleaning up if it fails.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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To find a host bridge's downstream bus number, we currently look at _BBN
first. If _BBN returns a bus number we've already seen, we conclude that
_BBN was wrong and look for a bus number in _CRS.
However, the spec[1] (figure 5-5 and the example in sec 9.12.1) and an ACPI
FAQ[2] suggest that the OS should use _CRS to discover the bus number
range, and that _BBN is really intended to bootstrap _CRS methods that
reference PCI opregions.
This patch makes us always look at _CRS first. If _CRS doesn't supply a
bus number, we look at _BBN. If _BBN doesn't exist, we default to zero.
This makes the behavior consistent regardless of device discovery order.
Previously, if A and B had duplicate _BBNs and we found A first, we'd only
look at B's _CRS, whereas if we found B first, we'd only look at A's _CRS.
I'm told that Windows discovers host bridge bus numbers using _CRS, so
it should be fairly safe to rely on this BIOS functionality.
This patch also removes two misleading messages: we printed the "Wrong _BBN
value, reboot and use option 'pci=noacpi'" message before looking at _CRS,
so we would likely find the bus number in _CRS, the system would work fine,
and the user would be confused. The "PCI _CRS %d overrides _BBN 0" message
incorrectly assumes _BBN was zero, and it's useless anyway because we
print the segment/bus number a few lines later.
References:
[1] http://www.acpi.info/DOWNLOADS/ACPIspec30b.pdf
[2] http://www.acpi.info/acpi_faq.htm _BBN/_CRS discussion
http://download.microsoft.com/download/9/8/f/98f3fe47-dfc3-4e74-92a3-088782200fe7/TWAR05005_WinHEC05.ppt (slide 17)
http://bugzilla.kernel.org/show_bug.cgi?id=1662 ASUS PR-DLS
http://bugzilla.kernel.org/show_bug.cgi?id=1127 ASUS PR-DLSW
http://bugzilla.kernel.org/show_bug.cgi?id=1741 ASUS PR-DLS533
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Reviewed-by: Alex Chiang <achiang@hp.com>
CC: Shaohua Li <shaohua.li@intel.com>
CC: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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There is no way to interact with a physical PCI slot without
sysfs, so encode the dependency and prevent this build error:
drivers/pci/slot.c: In function 'pci_hp_create_module_link':
drivers/pci/slot.c:327: error: 'module_kset' undeclared
This patch _should_ make pci-sysfs.o depend on CONFIG_SYSFS too,
but we cannot (yet) because the PCI core merrily assumes the
existence of sysfs:
drivers/built-in.o: In function `pci_bus_add_device':
drivers/pci/bus.c:89: undefined reference to `pci_create_sysfs_dev_files'
drivers/built-in.o: In function `pci_stop_dev':
drivers/pci/remove.c:24: undefined reference to `pci_remove_sysfs_dev_files'
So do the minimal bit for now and figure out how to untangle it
later.
Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fix-suggested-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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cosmetic only. The lapic_timer workaround routines
are specific to the lapic_timer, and are not acpi-generic.
old:
acpi_timer_check_state()
acpi_propagate_timer_broadcast()
acpi_state_timer_broadcast()
new:
lapic_timer_check_state()
lapic_timer_propagate_broadcast()
lapic_timer_state_broadcast()
also, simplify the code in acpi_processor_power_verify()
so that lapic_timer_check_state() is simply called
from one place for all valid C-states, including C1.
Signed-off-by: Len Brown <len.brown@intel.com>
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drivers/acpi/battery.c:841: warning: label ‘end’ defined but not used
Signed-off-by: Len Brown <len.brown@intel.com>
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This patch changes the global system notification path so it uses the
acpi_handle, not the acpi_device.
System notifications often deal with device presence and status change.
In these cases, we may not have an acpi_device. For example, we may
get a Device Check notification on an object that previously was not
present. Since the object was not present, we would not have had an
acpi_device for it.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Remove return values from acpi_bus_check_device() and acpi_bus_check_scope()
since nobody looks at them.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Remove "status_changed" return from acpi_bus_check_device(). Nobody
does anything useful based on its value.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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This replaces several messages that depend on the acpi_device struct
with a single message that uses just the acpi_handle. We should be
able to deal with notifications to objects that do not yet have an
acpi_device struct.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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This patch adds a .notify() method. The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
This driver apparently relies on seeing ALL notify events, not just
device-specific ones (because it used ACPI_ALL_NOTIFY). We use the
ACPI_DRIVER_ALL_NOTIFY_EVENTS driver flag to request all events.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
CC: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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This patch adds a .notify() method. The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.
This driver apparently relies on seeing ALL notify events, not just
device-specific ones (because it used ACPI_ALL_NOTIFY). We use the
ACPI_DRIVER_ALL_NOTIFY_EVENTS driver flag to request all events.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
CC: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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System notify events (0x00-0x7f) are common across all device types
and should be handled in Linux/ACPI, not in drivers. However, some
BIOSes use system notify events in device-specific ways that require
the driver to be involved.
This patch adds a ACPI_DRIVER_ALL_NOTIFY_EVENTS driver flag. When a
driver sets this flag and supplies a .notify method, Linux/ACPI calls
the .notify method for ALL notify events on the device, not just the
device-specific (0x80-0xff) events.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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acpi_get_pci_dev() is (hopefully) better, and all callers have been
converted, so let's get rid of this duplicated functionality.
Cc: Thomas Renninger <trenn@suse.de>
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Now that acpi_get_pci_dev is available, let's use it instead of
acpi_get_physical_pci_device()
Cc: Thomas Renninger <trenn@suse.de>
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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acpi_get_pci_dev() is better, and all callers have been converted, so
eliminate acpi_get_pci_id().
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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In acpi_pci_bind, we set device->ops.bind and device->ops.unbind, but
never clear them out.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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There is no need to pass a segment/bus tuple to this API, as the callsite
always has a struct pci_bus. We can derive segment/bus from the
struct pci_bus, so let's take this opportunit to simplify the API and
make life easier for the callers.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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A PCI domain cannot change as you descend down subordinate buses, which
makes the 'segment' argument to acpi_pci_irq_add_prt() useless.
Change the interface to take a struct pci_bus *, from whence we can derive
the bus number and segment. Reducing the number of arguments makes life
simpler for callers.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Now that we can dynamically convert an ACPI CA handle to a
struct pci_dev at runtime, there's no need to statically bind
them during boot.
acpi_pci_bind/unbind are vastly simplified, and are only used
to evaluate _PRT methods on P2P bridges and non-bridge children.
This patch also changes the time-space tradeoff ever so slightly.
Looking up the ACPI-PCI binding is never in the performance path, and by
eliminating this caching, we save 24 bytes for each _ADR device in the
ACPI namespace.
This patch lays further groundwork to eventually eliminate
the acpi_driver_ops.bind callback.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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This is a pure code movement patch that does $subject in order
to make the following patch easier to read and review.
No functional change.
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Convert an ACPI CA handle to a struct pci_dev.
Performing this lookup dynamically allows us to get rid of the
ACPI-PCI binding code, which:
- eliminates struct acpi_device vs struct pci_dev lifetime issues
- lays more groundwork for eliminating .start from acpi_device_ops
and thus simplifying ACPI drivers
- whacks out a lot of code
This change lays the groundwork for eliminating much of pci_bind.c.
Although pci_root.c may not be the most logical place for this
change, putting it here saves us from having to export acpi_pci_find_root.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Returns whether an ACPI CA node is a PCI root bridge or not.
This API is generically useful, and shouldn't just be a hotplug function.
The implementation becomes much simpler as well.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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acpi_pci_root_add() explicitly assigns device->ops.bind, and later
calls acpi_pci_bind_root(), which also does the same thing.
We don't need to repeat ourselves; removing the explicit assignment
allows us to make acpi_pci_bind() static.
Signed-off-by: Alex Chiang <achiang@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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Align labels in column 0, adjust spacing in 'if' statements, eliminate
trailing and superfluous whitespaces.
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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There is no apparent reason for acpi_device_register() to manually
register a new device in two steps (initialize then add).
Just call device_register() directly.
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
* 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (27 commits)
ACPICA: Update version to 20090521.
ACPICA: Disable preservation of SCI enable bit (SCI_EN)
ACPICA: Region deletion: Ensure region object is removed from handler list
ACPICA: Eliminate extra call to NsGetParentNode
ACPICA: Simplify internal operation region interface
ACPICA: Update Load() to use operation region interfaces
ACPICA: New: AcpiInstallMethod - install a single control method
ACPICA: Invalidate DdbHandle after table unload
ACPICA: Fix reference count issues for DdbHandle object
ACPICA: Simplify and optimize NsGetNextNode function
ACPICA: Additional validation of _PRT packages (resource mgr)
ACPICA: Fix DebugObject output for DdbHandle objects
ACPICA: Fix allowable release order for ASL mutex objects
ACPICA: Mutex support: Fix release ordering issue and current sync level
ACPICA: Update version to 20090422.
ACPICA: Linux OSL: cleanup/update/merge
ACPICA: Fix implementation of AML BreakPoint operator (break to debugger)
ACPICA: Fix miscellaneous warnings under gcc 4+
ACPICA: Miscellaneous lint changes
ACPICA: Fix possible dereference of null pointer
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (76 commits)
x86, apic: Fix dummy apic read operation together with broken MP handling
x86, apic: Restore irqs on fail paths
x86: Print real IOAPIC version for x86-64
x86: enable_update_mptable should be a macro
sparseirq: Allow early irq_desc allocation
x86, io-apic: Don't mark pin_programmed early
x86, irq: don't call mp_config_acpi_gsi() if update_mptable is not enabled
x86, irq: update_mptable needs pci_routeirq
x86: don't call read_apic_id if !cpu_has_apic
x86, apic: introduce io_apic_irq_attr
x86/pci: add 4 more return parameters to IO_APIC_get_PCI_irq_vector(), fix
x86: read apic ID in the !acpi_lapic case
x86: apic: Fixmap apic address even if apic disabled
x86: display extended apic registers with print_local_APIC and cpu_debug code
x86: read apic ID in the !acpi_lapic case
x86: clean up and fix setup_clear/force_cpu_cap handling
x86: apic: Check rev 3 fadt correctly for physical_apic bit
x86/pci: update pirq_enable_irq() to setup io apic routing
x86/acpi: move setup io apic routing out of CONFIG_ACPI scope
x86/pci: add 4 more return parameters to IO_APIC_get_PCI_irq_vector()
...
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These are defined as static cpumask_var_t so if MAXSMP is not used,
they are cleared already. Avoid surprises when MAXSMP is enabled.
Signed-off-by: Yinghai Lu <yinghai.lu@kernel.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Conflicts:
arch/mips/sibyte/bcm1480/irq.c
arch/mips/sibyte/sb1250/irq.c
Merge reason: we gathered a few conflicts plus update to latest upstream fixes.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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'redhat-bugzilla-500311', 'pci-bind-oops', 'misc-2.6.30' and 'i7300_idle' into release
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Commit 4973b22a ("ACPI processor: reset the throttling state once it's
invalid") introduced a new warning which prints a spurious newline.
The ACPI_WARNING macro that is used already takes care of adding a
newline, after adding ACPI_CA_VERSION to the message. Remove the newline
to avoid the message getting split into two lines.
Signed-off-by: Frans Pop <elendil@planet.nl>
Signed-off-by: Len Brown <len.brown@intel.com>
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Currently acpi_video_exit() is exported as well as using __exit which causes:
WARNING: drivers/acpi/video.o(__ksymtab+0x0): Section mismatch in reference from the variable __ksymtab_acpi_video_exit to the function .exit.text:acpi_video_exit()
The symbol acpi_video_exit is exported and annotated __exit
Fix this by removing the __exit annotation of acpi_video_exit or drop the export.
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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http://bugzilla.kernel.org/show_bug.cgi?id=13121
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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brightness
http://bugzilla.kernel.org/show_bug.cgi?id=13376
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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When BIOS SETUP is changed to disable EIST, some BIOS
hand the OS an un-initialized _PSS:
Name (_PSS, Package (0x06)
{
Package (0x06)
{
0x80000000, // frequency [MHz]
0x80000000, // power [mW]
0x80000000, // latency [us]
0x80000000, // BM latency [us]
0x80000000, // control
0x80000000 // status
},
...
These are outrageous values for frequency,
power and latency, raising the question where to draw
the line between legal and illegal. We tend to survive
garbage in the power and latency fields, but we can BUG_ON
when garbage is in the frequency field.
Cpufreq multiplies the frequency by 1000 and stores it in a u32 KHz.
So disregard a _PSS with a frequency so large
that it can't be represented by cpufreq.
https://bugzilla.redhat.com/show_bug.cgi?id=500311
Signed-off-by: Len Brown <len.brown@intel.com>
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ARB_DISABLE is a NOP on all of the recent Intel platforms.
For such platforms, reduce contention on c3_lock
by skipping the fake ARB_DISABLE.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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