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Subject: Re: [PATCH] riscv: dts: thead: set dma-noncoherent to soc bus
From:   Xi Ruoyao <xry111@xry111.site>
To:     Drew Fustini <dfustini@baylibre.com>
Cc:     Jisheng Zhang <jszhang@kernel.org>, Guo Ren <guoren@kernel.org>,
        Fu Wei <wefu@redhat.com>, Conor Dooley <conor@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        inux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Date:   Tue, 05 Sep 2023 00:28:41 +0800
In-Reply-To: <ZPXtl1iWlsYwmixc@xhacker>
References: <20230820115353.1962-1-jszhang@kernel.org> <ZPUXhe7ogxvaB6Eg@x1>
         <ZPXtl1iWlsYwmixc@xhacker>
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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.
> > >=20
> > > Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
> > > ---
> > > =C2=A0arch/riscv/boot/dts/thead/th1520.dtsi | 1 +
> > > =C2=A01 file changed, 1 insertion(+)
> > >=20
> > > 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 {
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0interrupt-parent =3D <&plic>;
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0#address-cells =3D <2>;
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0#size-cells =3D <2>;
> > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0dma-noncoherent;
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0ranges;
> > > =C2=A0
> > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0plic: interrupt-controller@ffd8000000 {
> > > --=20
> > > 2.40.1
> > >=20
> >=20
> > Tested-by: Drew Fustini <dfustini@baylibre.com>
> >=20
> > I tried this on the BeagleV Ahead. They system booted as expected and I
> > did not notice any problems in the boot log.
> >=20
> > Are there other patches such as the dwmac series that I should test thi=
s
> > with?
>=20
> 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?

--=20
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University