linux-kernel - Re: [PATCH 1/3] arm64: dts: qcom: msm8976: Make blsp

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Message-ID: <9a5130bf-dc1d-47de-9dc2-f2eab4faea17@oss.qualcomm.com>
Date: Sat, 14 Jun 2025 20:40:15 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: git@...tzsch.eu, 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: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: qcom: msm8976: Make blsp_dma
 controlled-remotely

On 6/13/25 12:37 AM, André Apitzsch via B4 Relay wrote:
> From: André Apitzsch <git@...tzsch.eu>
> 
> The blsp_dma controller is shared between the different subsystems,
> which is why it is already initialized by the firmware. We should not
> reinitialize it from Linux to avoid potential other users of the DMA
> engine to misbehave.
> 
> In mainline this can be described using the "qcom,controlled-remotely"
> property. In the downstream/vendor kernel from Qualcomm there is an
> opposite "qcom,managed-locally" property. This property is *not* set
> for the qcom,sps-dma@...4000 and qcom,sps-dma@...4000 [1] so adding
> "qcom,controlled-remotely" upstream matches the behavior of the
> downstream/vendor kernel.
> 
> Adding this fixes booting Longcheer L9360.
> 
> [1]: https://git.codelinaro.org/clo/la/kernel/msm-3.10/-/blob/LA.BR.1.3.7.c26/arch/arm/boot/dts/qcom/msm8976.dtsi#L1149-1163
> 
> Signed-off-by: André Apitzsch <git@...tzsch.eu>
> ---

Fixes: 0484d3ce0902 ("arm64: dts: qcom: Add DTS for MSM8976 and MSM8956 SoCs")
Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad