** Changed in: linux-snapdragon (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1841893
Title:
Dragonboard fails to boot: hangs after SMMU init
Status in linux-snapdragon package in Ubuntu:
Invalid
Status in linux-snapdragon source package in Bionic:
Fix Committed
Bug description:
Impact:
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]
Fix:
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.
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