linux-kernel - Re: [PATCH] dmaengine: xilinx

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Message-Id: <D8G323LHQBTV.5LVSPQ3DF2NQ@folker-schwesinger.de>
Date: Fri, 14 Mar 2025 15:10:04 +0000
From: "Folker Schwesinger" <dev@...ker-schwesinger.de>
To: "Thomas Gessler" <thomas.gessler@...eckmann-gmbh.de>,
 <dmaengine@...r.kernel.org>
Cc: "Vinod Koul" <vkoul@...nel.org>, "Michal Simek" <michal.simek@....com>,
 "Marek Vasut" <marex@...x.de>, "Radhey Shyam Pandey"
 <radhey.shyam.pandey@....com>, Uwe Kleine-König
 <u.kleine-koenig@...libre.com>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: xilinx_dma: Set max segment size

On Fri Mar 14, 2025 at 2:47 PM CET, Thomas Gessler wrote:
> Set the maximumg DMA segment size from the actual core configuration
> value. Without this setting, the default value of 64 KiB is reported,
> and larger sizes cannot be used for IIO DMAEngine buffers.
>
> Signed-off-by: Thomas Gessler <thomas.gessler@...eckmann-gmbh.de>

Tested-by: Folker Schwesinger <dev@...ker-schwesinger.de>

> ---
>  drivers/dma/xilinx/xilinx_dma.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
> index 108a7287f4cd..4b4a299e3807 100644
> --- a/drivers/dma/xilinx/xilinx_dma.c
> +++ b/drivers/dma/xilinx/xilinx_dma.c
> @@ -3114,6 +3114,8 @@ static int xilinx_dma_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	dma_set_max_seg_size(xdev->dev, xdev->max_buffer_len);
> +
>  	if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
>  		xdev->has_axistream_connected =
>  			of_property_read_bool(node, "xlnx,axistream-connected");