@@ -613,6 +613,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
/* First descriptor of the chain embedds additional information */
first->txd.cookie = -EBUSY;
first->len = len;
+ first->tx_width = src_width;
/* set end-of-link to the last link descriptor of list*/
set_desc_eol(desc);
@@ -759,6 +760,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
/* First descriptor of the chain embedds additional information */
first->txd.cookie = -EBUSY;
first->len = total_len;
+ first->tx_width = reg_width;
/* first link descriptor of list is responsible of flags */
first->txd.flags = flags; /* client is in control of this ack */
@@ -917,6 +919,7 @@ atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
/* First descriptor of the chain embedds additional information */
first->txd.cookie = -EBUSY;
first->len = buf_len;
+ first->tx_width = reg_width;
return &first->txd;
@@ -182,6 +182,7 @@ struct at_lli {
* @txd: support for the async_tx api
* @desc_node: node on the channed descriptors list
* @len: total transaction bytecount
+ * @tx_width: transfer width
*/
struct at_desc {
/* FIRST values the hardware uses */
@@ -192,6 +193,7 @@ struct at_desc {
struct dma_async_tx_descriptor txd;
struct list_head desc_node;
size_t len;
+ u32 tx_width;
};
static inline struct at_desc *
In one dma transfer, the data transfer width can be configured and it is limited by source or destination peripheral width, tx_width will save the transfer width, but for memcpy, either source or destination transfer width is taken as tx_width. Signed-off-by: Elen Song <elen.song@atmel.com> --- drivers/dma/at_hdmac.c | 3 +++ drivers/dma/at_hdmac_regs.h | 2 ++ 2 files changed, 5 insertions(+)