iommu/arm-smmu-qcom: Read back stream mappings

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The Qualcomm boot loader configures stream mapping for the peripherals
that it accesses and in particular it sets up the stream mapping for the
display controller to be allowed to scan out a splash screen or EFI
framebuffer.

Read back the stream mappings during initialization and make the
arm-smmu driver maintain the streams in bypass mode.

Cc: <stable@vger.kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Steev Klimaszewski <steev@kali.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20201019182323.3162386-3-bjorn.andersson@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>

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Bjorn Andersson 2020-10-19 11:23:22 -07:00 • committed by Will Deacon

parent 56b75b51ed

commit 07a7f2caaa

1 changed files with 23 additions and 0 deletions

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

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