From: Artur Rojek <contact@artur-rojek.eu>
To: Paul Cercueil <paul@crapouillou.net>, Vinod Koul <vkoul@kernel.org>
Cc: linux-mips@vger.kernel.org, dmaengine@vger.kernel.org,
linux-kernel@vger.kernel.org,
Artur Rojek <contact@artur-rojek.eu>
Subject: [PATCH] dmaengine: jz4780: Set max number of SGs per burst
Date: Sun, 29 Aug 2021 21:58:05 +0200 [thread overview]
Message-ID: <20210829195805.148964-1-contact@artur-rojek.eu> (raw)
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@artur-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
next reply other threads:[~2021-08-29 19:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-29 19:58 Artur Rojek [this message]
2021-08-30 9:48 ` [PATCH] dmaengine: jz4780: Set max number of SGs per burst Paul Cercueil
2021-10-11 14:09 ` Paul Cercueil
2021-10-18 6:37 ` Vinod Koul
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