linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm850-lenovo-yoga-c630: make SMMU non-DMA-coherent

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Message-ID: <3956606b-71de-4c71-afb0-c4918888db19@oss.qualcomm.com>
Date: Tue, 25 Feb 2025 14:38:53 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: Konrad Dybcio <quic_kdybcio@...cinc.com>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sdm850-lenovo-yoga-c630: make SMMU
 non-DMA-coherent

On 15.02.2025 3:43 AM, Dmitry Baryshkov wrote:
> The commit 6b31a9744b87 ("arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on
> apps_smmu") enabled dma-coherent property for the IOMMU device. This
> works for some devices, like Qualcomm RB3 platform, but at the same time
> it breaks booting on Lenovo Yoga C630 (most likely because of some TZ
> differences). Disable DMA coherency for IOMMU on Lenove Yoga C630.
> 
> Fixes: 6b31a9744b87 ("arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu")
> Cc: stable@...r.kernel.org
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---

Let's revert the offending commit instead, this must have been some
sort of fw development fluke..

Konrad