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arm64: tegra: Disable ISO SMMU for Tegra194 

Commit e762232f94 ("arm64: tegra: Add ISO SMMU controller for Tegra194")
added the ISO SMMU for display devices on Tegra194. The SMMU is enabled by
default but not hooked up to the display controllers yet because we do not
have a way to pass frame-buffer memory from the bootloader to the kernel.
However, even though the SMMU is not hooked up to the display controllers'
SMMU faults are being seen if a display is connected. Therefore, keep the
ISO SMMU disabled by default for now.

Fixes: e762232f94 ("arm64: tegra: Add ISO SMMU controller for Tegra194")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Jon Hunter 2022-01-13 14:31:52 +00:00 committed by Thierry Reding
parent 914ed1f565
commit ebea268ea5
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/boot/dts/nvidia/tegra194.dtsi
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@ -1585,7 +1585,7 @@
#iommu-cells = <1>;
nvidia,memory-controller = <&mc>;
status = "okay";
status = "disabled";
};
smmu: iommu@12000000 {