diff options
| author | Zhang Rui <rui.zhang@intel.com> | 2015-10-30 16:31:47 +0800 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-02-01 14:45:56 -0500 |
| commit | 247d403072cc86564439a919a4f9c48f46d138cd (patch) | |
| tree | d331b006bd421717334a1a66558cbd66efe5a670 /include/linux/thermal.h | |
| parent | 40b7566cb9872529f0b95bd913e16022e1107731 (diff) | |
Thermal: initialize thermal zone device correctly
[ Upstream commit bb431ba26c5cd0a17c941ca6c3a195a3a6d5d461 ]
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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.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 5eac316490ea..fb96b15693d4 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -40,6 +40,9 @@ /* No upper/lower limit requirement */ #define THERMAL_NO_LIMIT ((u32)~0) +/* use value, which < 0K, to indicate an invalid/uninitialized temperature */ +#define THERMAL_TEMP_INVALID -274000 + /* Unit conversion macros */ #define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \ ((long)t-2732+5)/10 : ((long)t-2732-5)/10) |