Re: [PATCH 2/2] arm64: dts: msm8996: Mark the GPU's SMMU as an adreno one.

Bjorn Andersson
2021-03-30T03:24:43Z

On Fri 26 Mar 18:13 CDT 2021, Eric Anholt wrote:

> This enables the adreno-specific SMMU path that sets HUPCF so
> (user-managed) page faults don't wedge the GPU.
>
> Signed-off-by: Eric Anholt <eric@anholt.net>

Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>

@Will, can you pick this together with the driver patch? (So that they
land in order)

Regards,
Bjorn

> ---
>
> We've been seeing a flaky test per day or so in Mesa CI where the
> kernel gets wedged after an iommu fault turns into CP errors. With
> this patch, the CI isn't throwing the string of CP errors on the
> faults in any of the ~10 jobs I've run so far.
>
> arch/arm64/boot/dts/qcom/msm8996.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> index 6de136e3add9..432b87ec9c5e 100644
> --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> @@ -1127,7 +1127,7 @@ cci_i2c1: i2c-bus@1 {
> };
>
> adreno_smmu: iommu@b40000 {
> - compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
> + compatible = "qcom,msm8996-smmu-v2", "qcom,adreno-smmu", "qcom,smmu-v2";
> reg = <0x00b40000 0x10000>;
>
> #global-interrupts = <1>;
> --
> 2.31.0
>