rocker_dma_test_one
err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_FILL,
err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_CLEAR,
err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_INVERT,