tree a263031ef2a3fc49116c967d960dc2979651d941
parent 8400291e289ee6b2bf9779ff1c83a291501f017b
author Rafael J. Wysocki <rafael.j.wysocki@intel.com> 1722350478 +0200
committer Rafael J. Wysocki <rafael.j.wysocki@intel.com> 1722421858 +0200

thermal: trip: Avoid skipping trips in thermal_zone_set_trips()

Say there are 3 trip points A, B, C sorted in ascending temperature
order with no hysteresis.  If the zone temerature is exactly equal to
B, thermal_zone_set_trips() will set the boundaries to A and C and the
hardware will not catch any crossing of B (either way) until either A
or C is crossed and the boundaries are changed.

To avoid that, use non-strict inequalities when comparing the trip
threshold to the zone temperature in thermal_zone_set_trips().

In the example above, it will cause both boundaries to be set to B,
which is desirable because an interrupt will trigger when the zone
temperature becomes different from B regardless of which way it goes.
That will allow a new interval to be set depending on the direction of
the zone temperature change.

Fixes: 893bae92237d ("thermal: trip: Make thermal_zone_set_trips() use trip thresholds")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/12509184.O9o76ZdvQC@rjwysocki.net