linux-kernel - Re: [PATCH v3 0/3] arm64: dts: qcom: agatti: Fix IOMMU DT properties

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Message-ID: <20260122172222.GA2670019-robh@kernel.org>
Date: Thu, 22 Jan 2026 11:22:22 -0600
From: Rob Herring <robh@...nel.org>
To: Sumit Garg <sumit.garg@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
	andersson@...nel.org, konradybcio@...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>
Subject: Re: [PATCH v3 0/3] arm64: dts: qcom: agatti: Fix IOMMU DT properties

On Thu, Jan 22, 2026 at 05:40:39PM +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.

To avoid intermittent warnings, Bjorn should pick up the whole series.

Rob