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

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Message-Id: <CTMJRMN2K8AY.20TQJE584A453@otso>
Date:   Mon, 26 Jun 2023 13:32:06 +0200
From:   "Luca Weiss" <luca.weiss@...rphone.com>
To:     "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
        "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

Hi Krzysztof,

On Wed Jun 21, 2023 at 4:36 PM CEST, 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.

Are you sure that the bam (and subsequent the qce) actually probes with
this change? From reading the code I don't see how the bam should probe
without either qcom,controlled-remotely or qcom,powered-remotely but no
clocks supplied. I think the probe just fails with this change, right?

Regards
Luca

>
> 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>
> ---
>  arch/arm64/boot/dts/qcom/sm8350.dtsi | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8350.dtsi b/arch/arm64/boot/dts/qcom/sm8350.dtsi
> index 88ef478cb5cc..b382ce66387e 100644
> --- a/arch/arm64/boot/dts/qcom/sm8350.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8350.dtsi
> @@ -1741,7 +1741,6 @@ cryptobam: dma-controller@...4000 {
>  			interrupts = <GIC_SPI 272 IRQ_TYPE_LEVEL_HIGH>;
>  			#dma-cells = <1>;
>  			qcom,ee = <0>;
> -			qcom,controlled-remotely;
>  			iommus = <&apps_smmu 0x594 0x0011>,
>  				 <&apps_smmu 0x596 0x0011>;
>  		};