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Commit e257e156 authored by Nicolas Ferre's avatar Nicolas Ferre Committed by Vinod Koul
Browse files

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: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 23b5e3ad

drivers/dma/at_hdmac.c

+3 −30
Original line number Diff line number Diff line
@@ -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;