linux-kernel - Re: [PATCH] riscv: dts: sophgo: fix DMA data-width configuration for CV18xx

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Message-ID: <uo7nea7hxw7qrzw7yhtoulusejbynw6qlotwozpboxtm6vyotv@rdkuc4d776so>
Date: Wed, 30 Apr 2025 14:54:23 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Ze Huang <huangze@...t.edu.cn>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Chen Wang <unicorn_wang@...look.com>, Inochi Amaoto <inochiama@...il.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>
Cc: devicetree@...r.kernel.org, sophgo@...ts.linux.dev, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Yu Yuan <yu.yuan@...u.edu.cn>, 
	Ze Huang <huange@...t.edu.cn>
Subject: Re: [PATCH] riscv: dts: sophgo: fix DMA data-width configuration for
 CV18xx

On Mon, Apr 28, 2025 at 05:24:36PM +0800, Ze Huang wrote:
> The "snps,data-width" property[1] defines the AXI data width of the DMA
> controller as:
> 
>     width = 8 × (2^n) bits
> 
> (0 = 8 bits, 1 = 16 bits, 2 = 32 bits, ..., 6 = 512 bits)
> where "n" is the value of "snps,data-width".
> 
> For the CV18xx DMA controller, the correct AXI data width is 32 bits,
> corresponding to "snps,data-width = 2".
> 
> Test results on Milkv Duo S can be found here [2].
> 
> Link: https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/dma/snps%2Cdw-axi-dmac.yaml#L74 [1]
> Link: https://gist.github.com/Sutter099/4fa99bb2d89e5af975983124704b3861 [2]
> 
> Co-developed-by: Yu Yuan <yu.yuan@...u.edu.cn>
> Signed-off-by: Yu Yuan <yu.yuan@...u.edu.cn>
> Signed-off-by: Ze Huang <huange@...t.edu.cn>
> ---
> Signed-off-by: Ze Huang <huangze@...t.edu.cn>

I think there is a wrong sob here, also, please add a fixes tag if
you fix something. I will take care of this when merging.

Fixes: 514951a81a5e ("riscv: dts: sophgo: cv18xx: add DMA controller")