* ......
* ->device_prep_slave_sg(0);
* ......
- * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ * ->device_prep_slave_sg(DMA_CTRL_ACK);
* ......
* [3] If there are more than two DMA commands in the DMA chain, the code
* should be:
* ......
* ->device_prep_slave_sg(0); // First
* ......
- * ->device_prep_slave_sg(DMA_PREP_INTERRUPT [| DMA_CTRL_ACK]);
+ * ->device_prep_slave_sg(DMA_CTRL_ACK]);
* ......
- * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK); // Last
+ * ->device_prep_slave_sg(DMA_CTRL_ACK); // Last
* ......
*/
static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg(
struct scatterlist *sg;
u32 i, j;
u32 *pio;
- bool append = flags & DMA_PREP_INTERRUPT;
- int idx = append ? mxs_chan->desc_count : 0;
+ int idx = 0;
- if (mxs_chan->status == DMA_IN_PROGRESS && !append)
- return NULL;
+ if (mxs_chan->status == DMA_IN_PROGRESS)
+ idx = mxs_chan->desc_count;
- if (sg_len + (append ? idx : 0) > NUM_CCW) {
+ if (sg_len + idx > NUM_CCW) {
dev_err(mxs_dma->dma_device.dev,
"maximum number of sg exceeded: %d > %d\n",
sg_len, NUM_CCW);
* If the sg is prepared with append flag set, the sg
* will be appended to the last prepared sg.
*/
- if (append) {
+ if (idx) {
BUG_ON(idx < 1);
ccw = &mxs_chan->ccw[idx - 1];
ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx;