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