linux-kernel - [PATCH] dmaengine: jz4780: Set max number of SGs per burst

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Message-Id: <20210829195805.148964-1-contact@artur-rojek.eu>
Date:   Sun, 29 Aug 2021 21:58:05 +0200
From:   Artur Rojek <contact@...ur-rojek.eu>
To:     Paul Cercueil <paul@...pouillou.net>, Vinod Koul <vkoul@...nel.org>
Cc:     linux-mips@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, Artur Rojek <contact@...ur-rojek.eu>
Subject: [PATCH] dmaengine: jz4780: Set max number of SGs per burst

Total amount of SG list entries executed in a single burst is limited by
the number of available DMA descriptors.
This information is useful for device drivers utilizing this DMA engine.

Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
---
 drivers/dma/dma-jz4780.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index ebee94dbd630..96701dedcac8 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -915,6 +915,7 @@ static int jz4780_dma_probe(struct platform_device *pdev)
 	dd->dst_addr_widths = JZ_DMA_BUSWIDTHS;
 	dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 	dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
+	dd->max_sg_burst = JZ_DMA_MAX_DESC;
 
 	/*
 	 * Enable DMA controller, mark all channels as not programmable.
-- 
2.33.0