linux-kernel - [PATCH 5/8] dmaengine: stm32-dma: use dma_set_max_seg

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Date:   Wed, 29 Jan 2020 16:36:25 +0100
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Pierre-Yves MORDRET <pierre-yves.mordret@...com>
Subject: [PATCH 5/8] dmaengine: stm32-dma: use dma_set_max_seg_size to set the sg limit

This patch adds dma_set_max_seg_size to define sg dma constraint.
This constraint may be taken into account by client to scatter/gather
its buffer.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
 drivers/dma/stm32-dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 25f7281932bd..b7e18cfcd439 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1323,6 +1323,8 @@ static int stm32_dma_probe(struct platform_device *pdev)
 		reset_control_deassert(rst);
 	}
 
+	dma_set_max_seg_size(&pdev->dev, STM32_DMA_ALIGNED_MAX_DATA_ITEMS);
+
 	dma_cap_set(DMA_SLAVE, dd->cap_mask);
 	dma_cap_set(DMA_PRIVATE, dd->cap_mask);
 	dma_cap_set(DMA_CYCLIC, dd->cap_mask);
-- 
2.17.1