CRITICALITY

Medium

DESCRIPTION

Spurious Thermal Alert: Talert can happen randomly while the device remains under the temperature limit defined for this event to trig. This spurious event is caused by a incorrect re-synchronization between clock domains. The comparison between configured threshold and current temperature value can happen while the value is transitioning (metastable), thus causing inappropriate event generation.

No spurious event occurs as long as the threshold value stays unchanged. Spurious event can be generated while a thermal alert threshold is modified in CTRL_CORE_BANDGAP_THRESHOLD_MPU/GPU/CORE/DSPEVE/IVA.

WORKAROUND

Spurious event generation can be avoided by performing following sequence when the threshold is modified:

1. Disable the alert interrupt: MPU_IRQ_126 into the interrupt handler.
2. Modify Threshold.
3. Clear the interrupt (cancel potential spurious event).
4. Enable the thermal alert interrupt again into the interrupt handler.

REVISIONS IMPACTED

AM571x SR 2.1, 2.0, 1.0
AM570x SR 2.1, 2.0

DRA79x: 2.1, 2.0

TDA2Ex (23mm): 2.0, 1.0

TDA2Ex (17mm): 2.1, 2.0

AM571x: 2.1, 2.0, 1.0

AM570x: 2.1, 2.0

DRA72x: 2.0, 1.0

DRA71x: 2.1, 2.0