Re: [PATCH v16 19/20] arm: dts: qcom: sm845: Set the compatible string for the GPU SMMU

[Bjorn Andersson]

On Tue 01 Sep 11:46 CDT 2020, Rob Clark wrote:

> From: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
> 
> Set the qcom,adreno-smmu compatible string for the GPU SMMU to enable
> split pagetables and per-instance pagetables for drm/msm.
> 
> Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
> Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>

Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>

> ---
>  arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi | 9 +++++++++
>  arch/arm64/boot/dts/qcom/sdm845.dtsi       | 2 +-
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi b/arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi
> index 64fc1bfd66fa..39f23cdcbd02 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi
> @@ -633,6 +633,15 @@ &mdss_mdp {
>  	status = "okay";
>  };
>  
> +/*
> + * Cheza fw does not properly program the GPU aperture to allow the
> + * GPU to update the SMMU pagetables for context switches.  Work
> + * around this by dropping the "qcom,adreno-smmu" compat string.
> + */
> +&adreno_smmu {
> +	compatible = "qcom,sdm845-smmu-v2", "qcom,smmu-v2";
> +};
> +
>  &mss_pil {
>  	iommus = <&apps_smmu 0x781 0x0>,
>  		 <&apps_smmu 0x724 0x3>;
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 2884577dcb77..76a8a34640ae 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -4058,7 +4058,7 @@ opp-257000000 {
>  		};
>  
>  		adreno_smmu: iommu@5040000 {
> -			compatible = "qcom,sdm845-smmu-v2", "qcom,smmu-v2";
> +			compatible = "qcom,sdm845-smmu-v2", "qcom,adreno-smmu", "qcom,smmu-v2";
>  			reg = <0 0x5040000 0 0x10000>;
>  			#iommu-cells = <1>;
>  			#global-interrupts = <2>;
> -- 
> 2.26.2
>