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

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Message-Id: <GLCNYQ.LL8K0PVSTZ1W1@crapouillou.net>
Date:   Mon, 30 Aug 2021 10:48:52 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Artur Rojek <contact@...ur-rojek.eu>
Cc:     Vinod Koul <vkoul@...nel.org>, linux-mips@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: jz4780: Set max number of SGs per burst

Hi,

Le dim., août 29 2021 at 21:58:05 +0200, Artur Rojek 
<contact@...ur-rojek.eu> a écrit :
> 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>

Acked-by: Paul Cercueil <paul@...pouillou.net>

Cheers,
-Paul

> ---
>  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
>