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Thu, 21 Aug 2025 01:15:19 -0700 (PDT) Received: from [127.0.0.2] ([2a02:2454:ff21:ef41:a59f:f2cf:3ca3:965]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3c074e38d7dsm10536232f8f.26.2025.08.21.01.15.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Aug 2025 01:15:19 -0700 (PDT) From: Stephan Gerhold Date: Thu, 21 Aug 2025 10:15:09 +0200 Subject: [PATCH] arm64: dts: qcom: sdm845: Fix slimbam num-channels/ees Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250821-sdm845-slimbam-channels-v1-1-498f7d46b9ee@linaro.org> X-B4-Tracking: v=1; b=H4sIAIzVpmgC/x2MQQqAIBAAvxJ7bkEtSfpKdLDaaiEtXIgg+nvWc WBmbhBKTAJtcUOik4X3mEGXBYyrjwshT5nBKGOVMxplCq62KBuHwQf8pEibYDNUqnZWN4YIcn0 kmvn6z13/PC+fFg9eaQAAAA== X-Change-ID: 20250821-sdm845-slimbam-channels-7b30485172ee To: Bjorn Andersson , Konrad Dybcio Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Srinivas Kandagatla , Vinod Koul , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.2 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 Reviewed-by: Dmitry Baryshkov --- 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/qco= m/sdm845.dtsi index 828b55cb6baf10458feae8f53c04663ef958601e..02536114edb88b86fedcc9be50c= 2205d2018e975 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 =3D "qcom,bam-v1.7.4", "qcom,bam-v1.7.0"; qcom,controlled-remotely; reg =3D <0 0x17184000 0 0x2a000>; - num-channels =3D <31>; + num-channels =3D <23>; interrupts =3D ; #dma-cells =3D <1>; qcom,ee =3D <1>; - qcom,num-ees =3D <2>; + qcom,num-ees =3D <4>; iommus =3D <&apps_smmu 0x1806 0x0>; }; =20 --- base-commit: 1aa50d938e88fcad1312467bd09be4037bfe68ff change-id: 20250821-sdm845-slimbam-channels-7b30485172ee Best regards, --=20 Stephan Gerhold