diff options
| author | Amelie Delaunay <amelie.delaunay@foss.st.com> | 2022-01-17 10:17:40 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-02-15 06:42:07 +0100 |
| commit | 728f6c783313fc789197837dce1f97d1f930cafe (patch) | |
| tree | b31e0de6179a0b34550a5b2a3233f804b06ed4a7 /drivers/dma/stm32-dma.c | |
| parent | dmaengine: imx-sdma: fix cyclic buffer race condition (diff) | |
| download | linux-728f6c783313fc789197837dce1f97d1f930cafe.tar.xz linux-728f6c783313fc789197837dce1f97d1f930cafe.zip | |
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 <amelie.delaunay@foss.st.com>
Tested-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/20220117091740.11064-1-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/stm32-dma.c')
| -rw-r--r-- | drivers/dma/stm32-dma.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 83a37a6955a3..d2365fab1b7a 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); |