dmaengine: at_hdmac: use descriptor chaining help function

A little function helps to chain descriptors:
it is already used in cyclic dma operations, now use it in memcpy and slave_sg
preparation functions.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 5968245..2c6bc3a 100644 (file)
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -626,16 +626,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 
                desc->txd.cookie = 0;
 
-               if (!first) {
-                       first = desc;
-               } else {
-                       /* inform the HW lli about chaining */
-                       prev->lli.dscr = desc->txd.phys;
-                       /* insert the link descriptor to the LD ring */
-                       list_add_tail(&desc->desc_node,
-                                       &first->tx_list);
-               }
-               prev = desc;
+               atc_desc_chain(&first, &prev, desc);
        }
 
        /* First descriptor of the chain embedds additional information */
@@ -726,16 +717,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                                        | len >> mem_width;
                        desc->lli.ctrlb = ctrlb;
 
-                       if (!first) {
-                               first = desc;
-                       } else {
-                               /* inform the HW lli about chaining */
-                               prev->lli.dscr = desc->txd.phys;
-                               /* insert the link descriptor to the LD ring */
-                               list_add_tail(&desc->desc_node,
-                                               &first->tx_list);
-                       }
-                       prev = desc;
+                       atc_desc_chain(&first, &prev, desc);
                        total_len += len;
                }
                break;
@@ -769,16 +751,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
                                        | len >> reg_width;
                        desc->lli.ctrlb = ctrlb;
 
-                       if (!first) {
-                               first = desc;
-                       } else {
-                               /* inform the HW lli about chaining */
-                               prev->lli.dscr = desc->txd.phys;
-                               /* insert the link descriptor to the LD ring */
-                               list_add_tail(&desc->desc_node,
-                                               &first->tx_list);
-                       }
-                       prev = desc;
+                       atc_desc_chain(&first, &prev, desc);
                        total_len += len;
                }
                break;