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The hardware-recommended software workaround is to issue every >> CFGI/TLBI command (each followed by CMD_SYNC) twice. The second issue is >> guaranteed to evict the entry. ATC_INV is not affected and must not be >> doubled. >> >> The erratum is not flagged by any SMMUv3 IDR/IIDR register, so it cannot >> be detected from hardware register. Tegra264 boots from device tree only >> and has no ACPI/IORT support, so detection is through device tree only. >> >> Add the ARM_SMMU_OPT_TLBI_TWICE option and set it on instances matching >> the existing "nvidia,tegra264-smmu" compatible. No callers consume the >> option yet, next patch wires the workaround into the CMDQ issue paths. > I was told to avoid "patch": once a patch is applied it becomes > a commit. So, maybe "a subsequent change will wire". Sure, I'll update it in next version. >> Signed-off-by: Ashish Mhetre > Reviewed-by: Nicolin Chen Thanks Nicolin.