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a5e6f584da
As recommended in section 4.3.7 "Synchronization when using the memory-mapped interface" of ARM IHI0064H.b: When using the memory-mapped interface to program the trace unit, the trace analyzer must ensure that writes have completed, to ensure that the trace unit is fully programmed and either enabled or disabled. To ensure writes have completed, the trace analyzer can do ... If the memory marked is as Device-nGnRE or stronger, read back the value of any register in the trace unit. This relies on peripheral coherence order defined in the Arm architecture. Polling TRCSTATR ensures the previous write has completed. Therefore, removes the redundant DSB barrier in the enabling flow. Update the comment in the disable flow for consistency. Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com> Signed-off-by: Leo Yan <leo.yan@arm.com> Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20251111-arm_coresight_power_management_fix-v6-7-f55553b6c8b3@arm.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.