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note, that this might incur a context switch now, IIUC. Before it was a busy loop, now under Zephyr this can actually cause a context switch. Although this path is only taken for DMA-driven pipelines and only when that delay is non-zero... And there might not be any other threads to switch to. So in practice this should be harmless and have no effect in 99.99% of the cases
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yep, this is intended - and we do need to rework the DMA driver scheduling at some point.