CONFIG_ARM64_ERRATUM_2064142: Cortex-A510: 2064142: workaround TRBE register writes while disabled

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_2064142:

• prompt: Cortex-A510: 2064142: workaround TRBE register writes while disabled
• type: bool
• depends on: CONFIG_CORESIGHT_TRBE
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.17–5.19, 6.0–6.12

Help text

This option adds the workaround for ARM Cortex-A510 erratum 2064142.

Affected Cortex-A510 core might fail to write into system registers after the TRBE has been disabled. Under some conditions after the TRBE has been disabled writes into TRBE registers TRBLIMITR_EL1, TRBPTR_EL1, TRBBASER_EL1, TRBSR_EL1, and TRBTRG_EL1 will be ignored and will not be effected.

Work around this in the driver by executing TSB CSYNC and DSB after collection is stopped and before performing a system register write to one of the affected registers.

If unsure, say Y.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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