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In some cases, platform thermal driver may report invalid trip points, thermal core should not take any action for these trip points. This fixed a regression that bogus trip point starts to screw up thermal control on some Lenovo laptops, after commit bb431ba Author: Zhang Rui <[email protected]> Date: Fri Oct 30 16:31:47 2015 +0800 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. Tested-by: Manuel Krause <[email protected]> Tested-by: szegad <[email protected]> Tested-by: prash <[email protected]> Tested-by: amish <[email protected]> Tested-by: Matthias <[email protected]> Reviewed-by: Javi Merino <[email protected]> Signed-off-by: Zhang Rui <[email protected]> Signed-off-by: Chen Yu <[email protected]> CC: <[email protected]> #3.18+ Link: https://bugzilla.redhat.com/show_bug.cgi?id=1317190 Link: https://bugzilla.kernel.org/show_bug.cgi?id=114551 Signed-off-by: Zhang Rui <[email protected]>
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