From: Amelie Delaunay <amelie.delaunay@foss.st.com>
To: Vinod Koul <vkoul@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <dmaengine@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Alain Volmat <alain.volmat@foss.st.com>,
Amelie Delaunay <amelie.delaunay@foss.st.com>
Subject: [PATCH] dmaengine: stm32-dma: set dma_device max_sg_burst
Date: Mon, 17 Jan 2022 10:17:40 +0100 [thread overview]
Message-ID: <20220117091740.11064-1-amelie.delaunay@foss.st.com> (raw)
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>
---
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 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);
--
2.25.1
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next reply other threads:[~2022-01-17 9:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-17 9:17 Amelie Delaunay [this message]
2022-01-17 9:25 ` [PATCH] dmaengine: stm32-dma: set dma_device max_sg_burst Alain Volmat
2022-02-15 5:42 ` Vinod Koul
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