dmaengine: stm32-dma: enable descriptor_reuse (22a0bb29) · Commits · 戴 / test

Enable client to resubmit already processed descriptors in order to save descriptor creation time. Signed-off-by:

drivers/dma/stm32-dma.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -554,6 +554,7 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
		sg_req = &chan->desc->sg_req[chan->next_sg];
		reg = &sg_req->chan_reg;

		reg->dma_scr &= ~STM32_DMA_SCR_EN;
		stm32_dma_write(dmadev, STM32_DMA_SCR(chan->id), reg->dma_scr);
		stm32_dma_write(dmadev, STM32_DMA_SPAR(chan->id), reg->dma_spar);
		stm32_dma_write(dmadev, STM32_DMA_SM0AR(chan->id), reg->dma_sm0ar);
		@@ -1343,6 +1344,7 @@ static int stm32_dma_probe(struct platform_device *pdev)
		dd->directions = BIT(DMA_DEV_TO_MEM) \| BIT(DMA_MEM_TO_DEV);
		dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
		dd->max_burst = STM32_DMA_MAX_BURST;
		dd->descriptor_reuse = true;
		dd->dev = &pdev->dev;
		INIT_LIST_HEAD(&dd->channels);