APPLIED: [PATCH 0/2] [B/snapdragon] [SRU] Dragonboard hangs after SMMU init
khalid.elmously at canonical.com
Tue Sep 3 05:36:29 UTC 2019
On 2019-08-29 14:32:12 , Paolo Pisati wrote:
> BugLink: https://bugs.launchpad.net/bugs/1841893
> Ubuntu-snapdragon-4.15.0-1061.68 hangs during boot:
> [ 1.856849] arm-smmu da0000.arm,smmu: probing hardware configuration...
> [ 1.859296] arm-smmu da0000.arm,smmu: SMMUv2 with:
> [ 1.865845] arm-smmu da0000.arm,smmu: stage 1 translation
> [ 1.870658] arm-smmu da0000.arm,smmu: address translation ops
> [ 1.876121] arm-smmu da0000.arm,smmu: non-coherent table walk
> [ 1.881936] arm-smmu da0000.arm,smmu: (IDR0.CTTW overridden by FW configuration)
> [ 1.887760] arm-smmu da0000.arm,smmu: stream matching with 4 register groups
> [ 1.895337] arm-smmu da0000.arm,smmu: 2 context banks (0 stage-2 only)
> [ 1.902455] arm-smmu da0000.arm,smmu: Supported page sizes: 0x63315000
> [ 1.908852] arm-smmu da0000.arm,smmu: Stage-1: 32-bit VA -> 36-bit IPA
> [hangs here]
> During the Ubuntu-snapdragon-4.15.0-1061.68, the qcom smmuv2 implementation was replaced with an upstream generic version that didn't explicit clocks, power requirements and early init via IOMMU_OF_DECLARE() - reverting the upstream patch, and reapplying the original qcom patch that was dropped, fixes this hang.
> How to test:
> Try to boot a patched kernel and see if it reaches userspace.
> Regression potential:
> None, since the current kernel version doesn't boot at all.
> Paolo Pisati (1):
> Revert "iommu/arm-smmu: Add support for qcom,smmu-v2 variant"
> Vivek Gautam (1):
> iommu/arm-smmu: Add support for qcom,smmu-v2 variant
> .../devicetree/bindings/iommu/arm,smmu.txt | 42 ++++++++++++++++++++++
> drivers/iommu/arm-smmu.c | 13 ++++++-
> 2 files changed, 54 insertions(+), 1 deletion(-)
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