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The FIFO watermark flag is a level: it stays high until the worker actually drains the FIFO below the threshold. Configuring INT1 as RISING made that a race the driver could lose permanently. lsm6ds3trc_interrupt() disables its IRQ on entry and re-enables it after the worker has run. With an edge trigger, if the line is still high when the IRQ is re-enabled -- which is precisely what happens whenever a drain does not take the FIFO below the watermark -- there is no new low-to-high transition left to detect, and the line goes mute forever. Observed as a board that serviced exactly one watermark after boot and then never again, reproducible 2 out of 2 reflashes. ONHIGH matches the physical meaning of the pin and is immune to it: a level trigger re-asserts on its own for as long as the condition holds, and the disable/enable pairing around servicing is what stops that from live-locking. Validated with more than 900 consecutive drains (~100 min) including real sleep -> GPIO-wake -> resume transitions, the exact case that used to wedge. Signed-off-by: Felipe Moura <moura.fmo@gmail.com> Assisted-by: Claude:claude-opus-5 |
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