linux-toradex.git/drivers/acpi, branch v3.14.2

ACPI / button: Add ACPI Button event via netlink routine

2014-04-27T00:19:03+00:00

commit 0bf6368ee8f25826d0645c0f7a4f17c8845356a4 upstream.

Commit 1696d9d (ACPI: Remove the old /proc/acpi/event interface)
removed ACPI Button event which originally was sent to userspace via
/proc/acpi/event. This caused ACPI shutdown regression on gentoo
in VirtualBox. Now ACPI events are sent to userspace via netlink,
so add ACPI Button event back via netlink routine.

References: https://bugzilla.kernel.org/show_bug.cgi?id=71721
Reported-and-tested-by: Richard Musil 
Signed-off-by: Lan Tianyu 
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Greg Kroah-Hartman

ACPI / sleep: Add extra checks for HW Reduced ACPI mode sleep states

2014-03-13T21:11:39+00:00

If the HW Reduced ACPI mode bit is set in the FADT, ACPICA uses
the optional sleep control and sleep status registers for making
the system enter sleep states (including S5), so it is not possible
to use system sleep states or power it off using ACPI if the HW
Reduced ACPI mode bit is set and those registers are not available.

For this reason, add a new function, acpi_sleep_state_supported(),
checking if the HW Reduced ACPI mode bit is set and whether or not
system sleep states are usable in that case in addition to checking
the return value of acpi_get_sleep_type_data() and make the ACPI
sleep setup routines use that function to check the availability of
system sleep states.

Among other things, this prevents the kernel from attempting to
use ACPI for powering off HW Reduced ACPI systems without the sleep
control and sleep status registers, because ACPI power off doesn't
have a chance to work on them.  That allows alternative power off
mechanisms that may actually work to be used on those systems.  The
affected machines include Dell Venue 8 Pro, Asus T100TA, Haswell
Desktop SDP and Ivy Bridge EP Demo depot.

References: https://bugzilla.kernel.org/show_bug.cgi?id=70931
Reported-by: Adam Williamson 
Tested-by: Aubrey Li 
Cc: 3.4+  # 3.4+
Signed-off-by: Rafael J. Wysocki

Revert "ACPI / sleep: pm_power_off needs more sanity checks to be installed"

2014-03-09T20:48:36+00:00

Revert commit 3130497f5bab ("ACPI / sleep: pm_power_off needs more
sanity checks to be installed") that breaks power ACPI power off on a
lot of systems, because it checks wrong registers.

Fixes: 3130497f5bab ("ACPI / sleep: pm_power_off needs more sanity checks to be installed")
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Linus Torvalds

Merge branches 'acpi-resources', 'acpi-ec' and 'acpi-sleep'

2014-03-08T00:07:06+00:00

* acpi-resources:
  ACPI / resources: ignore invalid ACPI device resources

* acpi-ec:
  ACPI / EC: Clear stale EC events on Samsung systems

* acpi-sleep:
  ACPI / sleep: pm_power_off needs more sanity checks to be installed

ACPI / EC: Clear stale EC events on Samsung systems

2014-03-06T12:27:23+00:00

A number of Samsung notebooks (530Uxx/535Uxx/540Uxx/550Pxx/900Xxx/etc)
continue to log events during sleep (lid open/close, AC plug/unplug,
battery level change), which accumulate in the EC until a buffer fills.
After the buffer is full (tests suggest it holds 8 events), GPEs stop
being triggered for new events. This state persists on wake or even on
power cycle, and prevents new events from being registered until the EC
is manually polled.

This is the root cause of a number of bugs, including AC not being
detected properly, lid close not triggering suspend, and low ambient
light not triggering the keyboard backlight. The bug also seemed to be
responsible for performance issues on at least one user's machine.

Juan Manuel Cabo found the cause of bug and the workaround of polling
the EC manually on wake.

The loop which clears the stale events is based on an earlier patch by
Lan Tianyu (see referenced attachment).

This patch:
 - Adds a function acpi_ec_clear() which polls the EC for stale _Q
   events at most ACPI_EC_CLEAR_MAX (currently 100) times. A warning is
   logged if this limit is reached.
 - Adds a flag EC_FLAGS_CLEAR_ON_RESUME which is set to 1 if the DMI
   system vendor is Samsung. This check could be replaced by several
   more specific DMI vendor/product pairs, but it's likely that the bug
   affects more Samsung products than just the five series mentioned
   above. Further, it should not be harmful to run acpi_ec_clear() on
   systems without the bug; it will return immediately after finding no
   data waiting.
 - Runs acpi_ec_clear() on initialisation (boot), from acpi_ec_add()
 - Runs acpi_ec_clear() on wake, from acpi_ec_unblock_transactions()

References: https://bugzilla.kernel.org/show_bug.cgi?id=44161
References: https://bugzilla.kernel.org/show_bug.cgi?id=45461
References: https://bugzilla.kernel.org/show_bug.cgi?id=57271
References: https://bugzilla.kernel.org/attachment.cgi?id=126801
Suggested-by: Juan Manuel Cabo 
Signed-off-by: Kieran Clancy 
Reviewed-by: Lan Tianyu 
Reviewed-by: Dennis Jansen 
Tested-by: Kieran Clancy 
Tested-by: Juan Manuel Cabo 
Tested-by: Dennis Jansen 
Tested-by: Maurizio D'Addona 
Tested-by: San Zamoyski 
Cc: All applicable 
Signed-off-by: Rafael J. Wysocki

ACPI / sleep: pm_power_off needs more sanity checks to be installed

2014-03-02T23:21:14+00:00

Sleep control and status registers need santity checks as well before
ACPI installs acpi_power_off to pm_power_off hook. The checking code in
acpi_enter_sleep_state() is too late, we should not allow a not-working
pm_power_off function to be hooked up.

Signed-off-by: Aubrey Li 
Signed-off-by: Rafael J. Wysocki

ACPI / resources: ignore invalid ACPI device resources

2014-03-01T21:46:05+00:00

ACPI table may export resource entry with 0 length.
But the current code interprets this kind of resource in a wrong way.
It will create a resource structure with
res->end = acpi_resource->start + acpi_resource->len - 1;

This patch fixes a problem on my machine that a platform device fails
to be created because one of its ACPI IO resource entry (start = 0,
end = 0, length = 0) is translated into a generic resource with
start = 0, end = 0xffffffff.

Signed-off-by: Zhang Rui 
Cc: All applicable 
Signed-off-by: Rafael J. Wysocki

ACPI / processor: Rework processor throttling with work_on_cpu()

2014-02-26T23:21:05+00:00

acpi_processor_set_throttling() uses set_cpus_allowed_ptr() to make
sure that the (struct acpi_processor)->acpi_processor_set_throttling()
callback will run on the right CPU.  However, the function may be
called from a worker thread already bound to a different CPU in which
case that won't work.

Make acpi_processor_set_throttling() use work_on_cpu() as appropriate
instead of abusing set_cpus_allowed_ptr().

Reported-and-tested-by: Jiri Olsa 
Signed-off-by: Lan Tianyu 
Cc: All applicable 
[rjw: Changelog]
Signed-off-by: Rafael J. Wysocki

Merge branches 'acpi-pm' and 'acpi-video'

2014-02-21T00:28:12+00:00

* acpi-pm:
  ACPI / thermal: fix thermal driver compile error when CONFIG_PM_SLEEP is undefined
  ACPI / SBS: fix SBS driver compile error when CONFIG_PM_SLEEP is undefined
  ACPI / fan: fix fan driver compile error when CONFIG_PM_SLEEP is undefined
  ACPI / button: fix button driver compile error when CONFIG_PM_SLEEP is undefined
  ACPI / battery: fix battery driver compile error when CONFIG_PM_SLEEP is undefined
  ACPI / AC: fix AC driver compile error when CONFIG_PM_SLEEP is undefined

* acpi-video:
  Revert "ACPI: Blacklist Win8 OSI for some HP laptop 2013 models"
  ACPI / video: Add systems that should favour native backlight interface
  ACPI / video: Filter the _BCL table for duplicate brightness values

Merge branches 'acpi-cleanup', 'acpi-dock', 'acpi-pci' and 'acpi-dsm'

2014-02-21T00:27:48+00:00

* acpi-cleanup:
  ACPI / SBS: Fix incorrect sscanf() string

* acpi-dock:
  ACPI / dock: Make 'docked' sysfs attribute work as documented

* acpi-pci:
  ACPI / PCI: Fix memory leak in acpi_pci_irq_enable()

* acpi-dsm:
  ACPI / nouveau: fix probing regression related to _DSM