arm64: dts: qcom: sdm845: Fix slimbam num-channels/ees

commit 316294bb6695a43a9181973ecd4e6fb3e576a9f7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index b77f65a612a13f574f108ad0bec896221fca3c3e..015239ed42a767e6e43c2e760ec4ffdd2dd7d257 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -5134,11 +5134,11 @@
                        compatible = "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>;
                };