linux-kernel - [PATCH -next] arm64: dts: sdm630: Temporarily disable SMMUs by default

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Message-Id: <20200629222610.168511-1-konradybcio@gmail.com>
Date:   Tue, 30 Jun 2020 00:26:10 +0200
From:   Konrad Dybcio <konradybcio@...il.com>
To:     skrzynka@...radybcio.pl
Cc:     Konrad Dybcio <konradybcio@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH -next] arm64: dts: sdm630: Temporarily disable SMMUs by default

There happens to be an issue between how kernel handles
qcom-smmuv2 and how the hypervisor would like it to be
handled. That results in the platform hanging completely
after the SMMUs are probed.

Hence, disable the SMMU nodes temporarily, until the
issue is rectified.

This has been overlooked by me in the initial
porting stage, as my defconfig has SMMU disabled.

Signed-off-by: Konrad Dybcio <konradybcio@...il.com>
---
 arch/arm64/boot/dts/qcom/sdm630.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm630.dtsi b/arch/arm64/boot/dts/qcom/sdm630.dtsi
index 88efe8200c80..deb928d303c2 100644
--- a/arch/arm64/boot/dts/qcom/sdm630.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm630.dtsi
@@ -518,6 +518,8 @@ anoc2_smmu: iommu@...0000 {
 				<GIC_SPI 472 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 473 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 474 IRQ_TYPE_LEVEL_HIGH>;
+
+			status = "disabled";
 		};
 
 		tcsr_mutex_regs: syscon@...0000 {
@@ -749,6 +751,8 @@ kgsl_smmu: iommu@...0000 {
 				<GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 349 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 350 IRQ_TYPE_LEVEL_HIGH>;
+
+			status = "disabled";
 		};
 
 		lpass_smmu: iommu@...0000 {
@@ -778,6 +782,8 @@ lpass_smmu: iommu@...0000 {
 				<GIC_SPI 225 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 310 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 404 IRQ_TYPE_LEVEL_HIGH>;
+
+			status = "disabled";
 		};
 
 		spmi_bus: spmi@...f000 {
@@ -1074,6 +1080,8 @@ mmss_smmu: iommu@...0000 {
 				<GIC_SPI 274 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 275 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 276 IRQ_TYPE_LEVEL_HIGH>;
+
+			status = "disabled";
 		};
 
 		apcs_glb: mailbox@...11000 {
-- 
2.27.0