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

[Jordan Crouse]

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@xxxxxxxxxxxxxx> wrote:
> >
> > Set the qcom,adreno-smmu compatible string for the GPU SMMU to enable
> > split pagetables.
> >
> > Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
> > ---
> >
> >  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@5040000 {
> > -                       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.

Jordan

> >                         reg = <0 0x5040000 0 0x10000>;
> >                         #iommu-cells = <1>;
> >                         #global-interrupts = <2>;
> > --
> > 2.17.1
> >
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