Public bug reported:
For some of the arm64 systems arm-smmu driver doesn't seem to work with
older versions of the firmware where it encounters "mmu-masters" in the
device-tree.
In this case, kernel is unable to map simple drm device and fail to boot
(Note that for "DMA_API" it works fine). See, drivers/iommu/arm/arm-
smmu/arm-smmu.c:arm_smmu_device_dt_probe() for more information.
I have seen the error for the following arm64 instances in testflinger:
moigno, igor, egede. Updating the firmware seems like one of the
possible solutions.
I have seen this error in 6.8 kernels (noble+jammy). However, both
series should fail regardless of the kernel version.
Focal can be different since "CONFIG_ARM_SMMU_LEGACY_DT_BINDINGS" config
options is not defined there. If Focal works, we can remove this config
option from Jammy and Noble.
See error messages below for more information.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Mehmet Basaran (mehmetbasaran)
Status: New
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2088458
Title:
noble/jammy arm-smmu and firmware discrepancy
Status in linux package in Ubuntu:
New
Status in linux source package in Jammy:
New
Status in linux source package in Noble:
New
Bug description:
For some of the arm64 systems arm-smmu driver doesn't seem to work
with older versions of the firmware where it encounters "mmu-masters"
in the device-tree.
In this case, kernel is unable to map simple drm device and fail to
boot (Note that for "DMA_API" it works fine). See,
drivers/iommu/arm/arm-smmu/arm-smmu.c:arm_smmu_device_dt_probe() for
more information.
I have seen the error for the following arm64 instances in
testflinger: moigno, igor, egede. Updating the firmware seems like one
of the possible solutions.
I have seen this error in 6.8 kernels (noble+jammy). However, both
series should fail regardless of the kernel version.
Focal can be different since "CONFIG_ARM_SMMU_LEGACY_DT_BINDINGS"
config options is not defined there. If Focal works, we can remove
this config option from Jammy and Noble.
See error messages below for more information.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2088458/+subscriptions
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