From 728f6c783313fc789197837dce1f97d1f930cafe Mon Sep 17 00:00:00 2001 From: Amelie Delaunay Date: Mon, 17 Jan 2022 10:17:40 +0100 Subject: [PATCH] dmaengine: stm32-dma: set dma_device max_sg_burst Some stm32-dma consumers [1] rather use dma_get_slave_caps() to get max_sg_burst of their DMA channel as dma_get_max_seg_size() is specific to the DMA controller. All stm32-dma channels have the same features so, don't need to implement device_caps ops. Let dma_get_slave_caps() relies on dma_device configuration. That's why this patch sets dma_device max_sg_burst to the maximum segment size, which is the maximum of data items that can be transferred without software intervention. [1] https://lore.kernel.org/lkml/20220110103739.118426-1-alain.volmat@foss.st.com/ "media: stm32: dcmi: create a dma scatterlist based on DMA max_sg_burst value" Signed-off-by: Amelie Delaunay Tested-by: Alain Volmat Link: https://lore.kernel.org/r/20220117091740.11064-1-amelie.delaunay@foss.st.com Signed-off-by: Vinod Koul --- drivers/dma/stm32-dma.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 83a37a6..d2365fa 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -1389,6 +1389,7 @@ static int stm32_dma_probe(struct platform_device *pdev) dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; dd->copy_align = DMAENGINE_ALIGN_32_BYTES; dd->max_burst = STM32_DMA_MAX_BURST; + dd->max_sg_burst = STM32_DMA_ALIGNED_MAX_DATA_ITEMS; dd->descriptor_reuse = true; dd->dev = &pdev->dev; INIT_LIST_HEAD(&dd->channels); -- 2.7.4