6.15-stable review patch. If anyone has any objections, please let me know.
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From: André Apitzsch git@apitzsch.eu
[ Upstream commit 76270a18dbdf0bb50615f1b29d2cae8d683da01e ]
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@7884000 and qcom,sps-dma@7ac4000 [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/arc...
Fixes: 0484d3ce0902 ("arm64: dts: qcom: Add DTS for MSM8976 and MSM8956 SoCs") Reviewed-by: Konrad Dybcio konrad.dybcio@oss.qualcomm.com Signed-off-by: André Apitzsch git@apitzsch.eu Link: https://lore.kernel.org/r/20250615-bqx5plus-v2-1-72b45c84237d@apitzsch.eu Signed-off-by: Bjorn Andersson andersson@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/qcom/msm8976.dtsi | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/msm8976.dtsi b/arch/arm64/boot/dts/qcom/msm8976.dtsi index d036f31dfdca..963996f7c927 100644 --- a/arch/arm64/boot/dts/qcom/msm8976.dtsi +++ b/arch/arm64/boot/dts/qcom/msm8976.dtsi @@ -1330,6 +1330,7 @@ blsp1_dma: dma-controller@7884000 { clock-names = "bam_clk"; #dma-cells = <1>; qcom,ee = <0>; + qcom,controlled-remotely; };
blsp1_uart1: serial@78af000 { @@ -1450,6 +1451,7 @@ blsp2_dma: dma-controller@7ac4000 { clock-names = "bam_clk"; #dma-cells = <1>; qcom,ee = <0>; + qcom,controlled-remotely; };
blsp2_uart2: serial@7af0000 {