 Stephan Gerhold <stephan.gerhold@linaro.org>
Date: Thu, 21 Aug 2025 10:15:09 +0200
Subject: [PATCH] arm64: dts: qcom: sdm845: Fix slimbam num-channels/ees

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@vger.kernel.org
Fixes: 27ca1de07dc3 ("arm64: dts: qcom: sdm845: add slimbus nodes")
Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250821-sdm845-slimbam-channels-v1-1-498f7d46b9ee@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 828b55cb6baf..02536114edb8 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -5396,11 +5396,11 @@ slimbam: dma-controller@17184000 {
 			compatible = "qcom,bam-v1.7.4", "qcom,bam-v1.7.0";
 			qcom,controlled-remotely;
 			reg = <0 0x17184000 0 0x2a000>;
-			num-channels = <31>;
+			num-channels = <23>;
 			interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
 			#dma-cells = <1>;
 			qcom,ee = <1>;
-			qcom,num-ees = <2>;
+			qcom,num-ees = <4>;
 			iommus = <&apps_smmu 0x1806 0x0>;
 		};
 FAILED: patch "[PATCH] arm64: dts: qcom: sdm845: Fix slimbam num-channels/ees" failed to apply to 5.10-stable tree<gregkh@linuxfoundation.org> undefinedstephan.gerhold@linaro.org,andersson@kernel.org,dmitry.baryshkov@oss.qualcomm.com undefined undefined undefined undefined•-ƒŸ1
