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authorZhang Rui <rui.zhang@intel.com>2015-10-30 16:31:47 +0800
committerSasha Levin <sasha.levin@oracle.com>2016-02-01 14:45:56 -0500
commit247d403072cc86564439a919a4f9c48f46d138cd (patch)
treed331b006bd421717334a1a66558cbd66efe5a670 /include
parent40b7566cb9872529f0b95bd913e16022e1107731 (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')
-rw-r--r--include/linux/thermal.h3
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)