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29e0b471cccqspi_indirect_read_execute() and cqspi_indirect_write_execute() first
set the enable bit on APB region and then start reading/writing to the
AHB region. On TI K3 SoCs these regions lie on different endpoints. This
means that the order of the two operations is not guaranteed, and they
might be reordered at the interconnect level.
It is possible for the AHB write to be executed before the APB write to
enable the indirect controller, causing the transaction to be invalid
and the write erroring out. Read back the APB region write before
accessing the AHB region to make sure the write got flushed and the race
condition is eliminated.
Fixes:
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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.