add a mechanism for delayed interrupts (aka. interrupt coalescing)
re-do fixed dma latency --HG-- extra : convert_revision : b91e6b69682f66e424782e89500d3ad47b797e25
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re-do fixed dma latency --HG-- extra : convert_revision : b91e6b69682f66e424782e89500d3ad47b797e25