DMA_ERR
dga->csr |= DMA_ERR; /* clear error condition */
if (!(dga->csr & DMA_ERR)) {
dga->csr |= DMA_ERR; /* clear error condition */
if (dga->csr & DMA_ERR) {
if (dga->csr & DMA_ERR) {
dga->csr |= DMA_ERR; /* clear error condition */