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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. >>>> >>>> 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. >>> Can you not detect this implementation from IIDR like for our other >>> workarounds? Otherwise what about ACPI? >> Neither IDR nor IIDR flags this Tegra264-specific bug. We cannot >> detect it from any HW register, so we have to rely on the Tegra264 >> device tree. >> Regarding ACPI, the bug is in Tegra264 only, and Tegra264 is >> device-tree-only. It doesn't support ACPI/IORT as of now. > Let's add a note in the commit message. > > Nicolin Sure, will do and resend. Thanks, Ashish Mhetre