linux-kernel - Re: [PATCH] riscv: dts: thead: set dma-noncoherent to soc bus

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Date:   Sun, 3 Sep 2023 16:32:21 -0700
From:   Drew Fustini <dfustini@...libre.com>
To:     Jisheng Zhang <jszhang@...nel.org>
Cc:     Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
        Conor Dooley <conor@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        inux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: dts: thead: set dma-noncoherent to soc bus

On Sun, Aug 20, 2023 at 07:53:53PM +0800, Jisheng Zhang wrote:
> riscv select ARCH_DMA_DEFAULT_COHERENT by default, and th1520 isn't
> dma coherent, so set dma-noncoherent to reflect this fact.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  arch/riscv/boot/dts/thead/th1520.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/riscv/boot/dts/thead/th1520.dtsi b/arch/riscv/boot/dts/thead/th1520.dtsi
> index 56a73134b49e..58108f0eb3fd 100644
> --- a/arch/riscv/boot/dts/thead/th1520.dtsi
> +++ b/arch/riscv/boot/dts/thead/th1520.dtsi
> @@ -139,6 +139,7 @@ soc {
>  		interrupt-parent = <&plic>;
>  		#address-cells = <2>;
>  		#size-cells = <2>;
> +		dma-noncoherent;
>  		ranges;
>  
>  		plic: interrupt-controller@...8000000 {
> -- 
> 2.40.1
> 

Tested-by: Drew Fustini <dfustini@...libre.com>

I tried this on the BeagleV Ahead. They system booted as expected and I
did not notice any problems in the boot log.

Are there other patches such as the dwmac series that I should test this
with?

Also, I think this might have missed patchwork since the original email
had a typo for the list, so it might be good to resend it?

Thanks,
Drew