From: Stephan Gerhold stephan.gerhold@linaro.org
[ Upstream commit 316294bb6695a43a9181973ecd4e6fb3e576a9f7 ]
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... Signed-off-by: Bjorn Andersson andersson@kernel.org [ Adjust context ] Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/qcom/sdm845.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi index da48ae60155af..4422392fb60e0 100644 --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi @@ -4492,11 +4492,11 @@ slimbam: dma@17184000 { 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>; };