Commit 728f6c78 authored by Amelie Delaunay's avatar Amelie Delaunay Committed by Vinod Koul
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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: default avatarAmelie Delaunay <amelie.delaunay@foss.st.com>
Tested-by: default avatarAlain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/20220117091740.11064-1-amelie.delaunay@foss.st.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 177360e0

drivers/dma/stm32-dma.c

+1 −0
Original line number Diff line number Diff line
@@ -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);