linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845: Fix slimbam num-channels/ees

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Message-ID: <n7wtrddc73fn2g3kh3gre33vhr5o6qjajqooczt4h64n64u7bw@tztkbyk2l7dp>
Date: Thu, 21 Aug 2025 12:58:58 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: 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>,
        Srinivas Kandagatla <srini@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sdm845: Fix slimbam num-channels/ees

On Thu, Aug 21, 2025 at 10:15:09AM +0200, Stephan Gerhold wrote:
> Reading the hardware registers of the &slimbam on RB3 reveals that the BAM
> supports only 23 pipes (channels) and supports 4 EEs instead of 2. This
> hasn't caused problems so far since nothing is using the extra channels,
> but attempting to use them would lead to crashes.
> 
> The bam_dma driver might warn in the future if the num-channels in the DT
> are wrong, so correct the properties in the DT to avoid future regressions.
> 
> Cc: stable@...r.kernel.org
> Fixes: 27ca1de07dc3 ("arm64: dts: qcom: sdm845: add slimbus nodes")
> Signed-off-by: Stephan Gerhold <stephan.gerhold@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

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


-- 
With best wishes
Dmitry