linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: agatti: Fix IOMMU DT properties

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Message-ID: <inqfbz3tlmwtvco3k5zhyy5wtskvgzorbr5am6rmeajlwrcphq@l55h2bmanvvo>
Date: Fri, 16 Jan 2026 10:40:14 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Sumit Garg <sumit.garg@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, akhilpo@....qualcomm.com,
        vikash.garodia@....qualcomm.com, dikshita.agarwal@....qualcomm.com,
        robin.clark@....qualcomm.com, lumag@...nel.org,
        loic.poulain@....qualcomm.com, jorge.ramirez@....qualcomm.com,
        linux-kernel@...r.kernel.org, Sumit Garg <sumit.garg@....qualcomm.com>,
        Prakash Gupta <guptap@....qualcomm.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: agatti: Fix IOMMU DT properties

On Fri, Jan 16, 2026 at 11:50:04AM +0530, Sumit Garg wrote:
> From: Sumit Garg <sumit.garg@....qualcomm.com>
> 
> Fix IOMMU DT propeties for GPU, display and video peripherals via
> dropping SMMU stream IDs which relates to secure context bank.
> 
> This problem only surfaced when the Gunyah based firmware stack is
> ported on Agatti replacing the legacy QHEE based firmware stack. Assigning
> Linux kernel (HLOS) VMID to secure context bank stream IDs is treated
> as a fault by Gunyah hypervisor which were previously ignored by QHEE
> hypervisor.
> 
> The DT changes should be backwards compatible with legacy QHEE based
> firmware stack too.
> 
> Suggested-by: Prakash Gupta <guptap@....qualcomm.com>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> Reviewed-by: Akhil P Oommen <akhilpo@....qualcomm.com>
> Signed-off-by: Sumit Garg <sumit.garg@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/agatti.dtsi | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry