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

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Message-ID: <292198d3915bafbe1c82372da2f2755a1842512f.camel@xry111.site>
Date:   Tue, 05 Sep 2023 00:28:41 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Drew Fustini <dfustini@...libre.com>
Cc:     Jisheng Zhang <jszhang@...nel.org>, 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 Mon, 2023-09-04 at 22:45 +0800, Jisheng Zhang wrote:
> On Sun, Sep 03, 2023 at 04:32:21PM -0700, Drew Fustini wrote:
> > 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?
> 
> Hmm, this patch is necessary to test dwmac, emmc ;)

Drew: does this fix the "broken DMA" issue you've mentioned in the EMMC
support patch?

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University