linux-kernel - Re: [Freedreno] [PATCH v7 6/6] arm6: dts: qcom: sm845: Set the compatible string for the GPU SMMU

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Message-ID: <CAF6AEGssC5ZJKh3oMR6fFRJwZvWLy4YjE2anvq5sDmPB_ikv0Q@mail.gmail.com>
Date:   Thu, 4 Jun 2020 15:38:28 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Rob Clark <robdclark@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        freedreno <freedreno@...ts.freedesktop.org>
Subject: Re: [Freedreno] [PATCH v7 6/6] arm6: dts: qcom: sm845: Set the
 compatible string for the GPU SMMU

On Thu, Jun 4, 2020 at 3:02 PM Jordan Crouse <jcrouse@...eaurora.org> wrote:
>
> On Thu, Jun 04, 2020 at 02:27:21PM -0700, Rob Clark wrote:
> > On Thu, Jun 4, 2020 at 1:57 PM Jordan Crouse <jcrouse@...eaurora.org> wrote:
> > >
> > > Set the qcom,adreno-smmu compatible string for the GPU SMMU to enable
> > > split pagetables.
> > >
> > > Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> > > ---
> > >
> > >  arch/arm64/boot/dts/qcom/sdm845.dtsi | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > index 8eb5a31346d2..8b15cd74e9ba 100644
> > > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > > @@ -3556,7 +3556,7 @@
> > >                 };
> > >
> > >                 adreno_smmu: iommu@...0000 {
> > > -                       compatible = "qcom,sdm845-smmu-v2", "qcom,smmu-v2";
> > > +                       compatible = "qcom,adreno-smmu", "qcom,smmu-v2";
> >
> > Should this be something like:
> >
> >    compatible = "qcom,adreno-smmu", "qcom,sdm845-smmu-v2", "qcom,smmu-v2";
> >
> > so that new dtb still works with old kernel?
>
> As far as I know qcom,sdm845-smmu-v2 never was actually used unless we were
> doing the parsing trick somewhere.

I *think* it has a use queued up for v5.8 for the
select-direct-mapping stuff?  I'm not 100% sure of the status of that
off the top of my head.

BR,
-R

> Jordan
>
> > >                         reg = <0 0x5040000 0 0x10000>;
> > >                         #iommu-cells = <1>;
> > >                         #global-interrupts = <2>;
> > > --
> > > 2.17.1
> > >
> > > _______________________________________________
> > > Freedreno mailing list
> > > Freedreno@...ts.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/freedreno
> > _______________________________________________
> > Freedreno mailing list
> > Freedreno@...ts.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/freedreno
>
> --
> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project

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