iommu/arm-smmu-qcom: Initialize SCTLR of the bypass context

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On SM8150 it's occasionally observed that the boot hangs in between the
writing of SMEs and context banks in arm_smmu_device_reset().

The problem seems to coincide with a display refresh happening after
updating the stream mapping, but before clearing - and there by
disabling translation - the context bank picked to emulate translation
bypass.

Resolve this by explicitly disabling the bypass context already in
cfg_probe.

Fixes: f9081b8ff5 ("iommu/arm-smmu-qcom: Implement S2CR quirk")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210106005038.4152731-1-bjorn.andersson@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>

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Bjorn Andersson 2021-01-05 16:50:38 -08:00 • committed by Will Deacon

parent 420d42f6f9

commit aded8c7c2b

1 changed files with 2 additions and 0 deletions

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

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