CPDMA_STATE_TEARDOWN
if (chan->state == CPDMA_STATE_TEARDOWN) {
if (chan->state == CPDMA_STATE_TEARDOWN) {
if (chan->state == CPDMA_STATE_TEARDOWN) {
chan->state = CPDMA_STATE_TEARDOWN;
ctlr->state = CPDMA_STATE_TEARDOWN;