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| author | Zhang Rui <rui.zhang@intel.com> | 2015-10-30 16:31:47 +0800 |
|---|---|---|
| committer | Zhang Rui <rui.zhang@intel.com> | 2015-12-29 15:59:44 +0800 |
| commit | bb431ba26c5cd0a17c941ca6c3a195a3a6d5d461 (patch) | |
| tree | 10368cd1731f1856bade627fa1f38acd9150d3a5 /include/linux/thermal.h | |
| parent | 74bf8efb5fa6e958d2d7c7917b8bb672085ec0c6 (diff) | |
| download | lwn-bb431ba26c5cd0a17c941ca6c3a195a3a6d5d461.tar.gz lwn-bb431ba26c5cd0a17c941ca6c3a195a3a6d5d461.zip | |
Thermal: initialize thermal zone device correctly
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: <stable@vger.kernel.org> #3.18+
Tested-by: Manuel Krause <manuelkrause@netscape.net>
Tested-by: szegad <szegadlo@poczta.onet.pl>
Tested-by: prash <prash.n.rao@gmail.com>
Tested-by: amish <ammdispose-arch@yahoo.com>
Tested-by: Matthias <morpheusxyz123@yahoo.de>
Reviewed-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Diffstat (limited to 'include/linux/thermal.h')
| -rw-r--r-- | include/linux/thermal.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 613c29bd6baf..103fcbe6bdaf 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -43,6 +43,9 @@ /* Default weight of a bound cooling device */ #define THERMAL_WEIGHT_DEFAULT 0 +/* use value, which < 0K, to indicate an invalid/uninitialized temperature */ +#define THERMAL_TEMP_INVALID -274000 + /* Unit conversion macros */ #define DECI_KELVIN_TO_CELSIUS(t) ({ \ long _t = (t); \ |