linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8350: fix BAM DMA crash and reboot

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Message-ID: <fce2d704-6801-afd9-ea9d-607c7ff8f46c@linaro.org>
Date:   Wed, 21 Jun 2023 16:37:19 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH] arm64: dts: qcom: sm8350: fix BAM DMA crash and reboot

On 21/06/2023 16:36, Krzysztof Kozlowski wrote:
> SM8350 HDK and MTP boards were silently dying and rebooting during BAM
> DMA probe:
> 
>   [    1.574304] vreg_bob: Setting 3008000-3960000uV
>   [    1.576918] bam-dFormat: Log Type - Time(microsec) - Message -
>   Optional Info
>   Log Type: B - Since Boot(Power On Reset),  D - Delta,  S - Statistic
>   S - QC_IMAGE_VERSION_STRING=BOOT.MXF.1.0-00637.1-LAHAINA-1
>   S - IMAGE_VARIANT_STRING=SocLahainaLAA
>   S - OEM_IMAGE_VERSION_STRING=crm-ubuntu77
>   S - Boot Interface: UFS
> 
> It seems that BAM DMA is locally controller (not by firmware) and
> requires proper initialization by the driver prior to use, at least on
> HDK8350 and MTP8350, but probably on all boards.
> 
> Fixes: f1040a7fe8f0 ("arm64: dts: qcom: sm8350: Add Crypto Engine support")
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---
> 
> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---

#regzbot fix: f1040a7fe8f069d2259ab3dab9190210005ceb33

Best regards,
Krzysztof