iommu/arm-smmu: Allow implementation specific write_s2cr

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The firmware found in some Qualcomm platforms intercepts writes to the
S2CR register in order to replace the BYPASS type with FAULT. Further
more it treats faults at this level as catastrophic and restarts the
device.

Add support for providing implementation specific versions of the S2CR
write function, to allow the Qualcomm driver to work around this
behavior.

Cc: <stable@vger.kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Steev Klimaszewski <steev@kali.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20201019182323.3162386-2-bjorn.andersson@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>

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Bjorn Andersson 2020-10-19 11:23:21 -07:00 • committed by Will Deacon

parent 3650b228f8

commit 56b75b51ed

2 changed files with 11 additions and 3 deletions

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

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drivers/iommu/arm/arm-smmu/arm-smmu.h

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