iommu/qcom: Enable clocks before hardware access in qcom_iommu_ctx_probe()

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qcom_iommu_ctx_probe() reads and writes the CB_FSR register to clear any
stale IRQ left by the bootloader. This happens during
devm_of_platform_populate() which is called from the parent device's
probe before any pm_runtime_get(). The parent's clocks (iface, bus, tbu)
are therefore not guaranteed to be on, making the register access
unreliable on rebind or after a suspend cycle.

Use pm_runtime_resume_and_get() on the parent device to ensure clocks
are enabled before the register access, and release the reference
immediately after.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Signed-off-by: Will Deacon <will@kernel.org>

...

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Mukesh Ojha 2026-07-17 20:16:08 +05:30 • committed by Will Deacon

parent a05b67cd45

commit cb776a03a5

1 changed files with 6 additions and 1 deletions

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drivers/iommu/arm/arm-smmu/qcom_iommu.c

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