29 Dec, 2015
1 commit
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After thermal zone device registered, as we have not read any
temperature before, thus tz->temperature should not be 0,
which actually means 0C, and thermal trend is not available.
In this case, we need specially handling for the first
thermal_zone_device_update().Both thermal core framework and step_wise governor is
enhanced to handle this. And since the step_wise governor
is the only one that uses trends, so it's the only thermal
governor that needs to be updated.CC: #3.18+
Tested-by: Manuel Krause
Tested-by: szegad
Tested-by: prash
Tested-by: amish
Tested-by: Matthias
Reviewed-by: Javi Merino
Signed-off-by: Zhang Rui
Signed-off-by: Chen Yu
11 Jun, 2015
1 commit
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…inux-soc-thermal into thermal-soc
05 May, 2015
3 commits
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The power allocator governor is a thermal governor that controls system
and device power allocation to control temperature. Conceptually, the
implementation divides the sustainable power of a thermal zone among
all the heat sources in that zone.This governor relies on "power actors", entities that represent heat
sources. They can report current and maximum power consumption and
can set a given maximum power consumption, usually via a cooling
device.The governor uses a Proportional Integral Derivative (PID) controller
driven by the temperature of the thermal zone. The output of the
controller is a power budget that is then allocated to each power
actor that can have bearing on the temperature we are trying to
control. It decides how much power to give each cooling device based
on the performance they are requesting. The PID controller ensures
that the total power budget does not exceed the control temperature.Cc: Zhang Rui
Cc: Eduardo Valentin
Signed-off-by: Punit Agrawal
Signed-off-by: Javi Merino
Signed-off-by: Eduardo Valentin -
It's useful to have access to the weights for the cooling devices for
thermal zones and change them if needed. Export them to sysfs.Cc: Zhang Rui
Cc: Eduardo Valentin
Signed-off-by: Javi Merino
Signed-off-by: Eduardo Valentin -
Currently you can specify the weight of the cooling device in the device
tree but that information is not populated to the
thermal_bind_params where the fair share governor expects it to
be. The of thermal zone device doesn't have a thermal_bind_params
structure and arguably it's better to pass the weight inside the
thermal_instance as it is specific to the bind of a cooling device to a
thermal zone parameter.Core thermal code is fixed to populate the weight in the instance from
the thermal_bind_params, so platform code that was passing the weight
inside the thermal_bind_params continue to work seamlessly.While we are at it, create a default value for the weight parameter for
those thermal zones that currently don't define it and remove the
hardcoded default in of-thermal.Cc: Zhang Rui
Cc: "Rafael J. Wysocki"
Cc: Len Brown
Cc: Peter Feuerer
Cc: Darren Hart
Cc: Eduardo Valentin
Cc: Kukjin Kim
Cc: Durgadoss R
Signed-off-by: Kapileshwar Singh
Signed-off-by: Eduardo Valentin
01 May, 2015
1 commit
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Use the normal return values for bool functions
Signed-off-by: Joe Perches
Signed-off-by: Zhang Rui
06 Jan, 2015
1 commit
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With gcc 4.1.2, 4.2, and 4.2.4 (4.4 and later are OK):
drivers/thermal/thermal_core.h:110: warning: type qualifiers ignored on function return type
Signed-off-by: Geert Uytterhoeven
Fixes: ce8be7785922de0e ("thermal: of: Extend of-thermal to export table of trip points")
Signed-off-by: Eduardo Valentin
09 Dec, 2014
3 commits
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This patch extends the of-thermal.c to export trip points for a given
thermal zone.Thermal drivers should use of_thermal_get_trip_points() method to get
pointer to table of thermal trip points.Signed-off-by: Lukasz Majewski
Signed-off-by: Eduardo Valentin -
This patch extends the of-thermal.c to provide check if trip point is
valid.Signed-off-by: Lukasz Majewski
Signed-off-by: Eduardo Valentin -
This patch extends the of-thermal.c to provide information about number of
available trip points.Signed-off-by: Lukasz Majewski
Signed-off-by: Eduardo Valentin
27 Aug, 2014
1 commit
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The bang-bang thermal governor uses a hysteresis to switch abruptly on
or off a cooling device. It is intended to control fans, which can
not be throttled but just switched on or off.
Bang-bang cannot be set as default governor as it is intended for
special devices only. For those special devices the driver needs to
explicitely request it.Cc: Andrew Morton
Cc: Zhang Rui
Cc: Andreas Mohr
Cc: Borislav Petkov
Cc: Javi Merino
Cc: linux-pm@vger.kernel.org
Signed-off-by: Peter Feuerer
Signed-off-by: Zhang Rui
04 Dec, 2013
1 commit
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This patch introduces a device tree bindings for
describing the hardware thermal behavior and limits.
Also a parser to read and interpret the data and feed
it in the thermal framework is presented.This patch introduces a thermal data parser for device
tree. The parsed data is used to build thermal zones
and thermal binding parameters. The output data
can then be used to deploy thermal policies.This patch adds also documentation regarding this
API and how to define tree nodes to use
this infrastructure.Note that, in order to be able to have control
on the sensor registration on the DT thermal zone,
it was required to allow changing the thermal zone
.get_temp callback. For this reason, this patch
also removes the 'const' modifier from the .ops
field of thermal zone devices.Cc: Zhang Rui
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Mark Rutland
Signed-off-by: Eduardo Valentin
14 Apr, 2013
1 commit
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The thermal governors are part of the thermal framework,
rather than a seperate feature/module.
Because the generic thermal layer can not work without
thermal governors, and it must load the thermal governors
during its initialization.Build them into one module in this patch.
This also fix a problem that the generic thermal layer does not
work when CONFIG_THERMAL=m and CONFIG_THERMAL_GOV_XXX=y.Signed-off-by: Zhang Rui
Acked-by: Eduardo Valentin
Acked-by: Durgadoss R
05 Nov, 2012
1 commit
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This patch creates a thermal_core.h file which can contain
all defines used by the core thermal framework files. For
now, move the thermal_instance structure to thermal_core.h
This structure is used by files under drivers/thermal/.Signed-off-by: Durgadoss R
Signed-off-by: Zhang Rui
