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During dummy-cycles xSPI will switch GPIO into Hi-Z mode. In that dummy period voltage on data lines will slowly drop, what can cause unintentional modebyte transmission. Value send to SPI memory chip will depend on last address, and clock frequency. To prevent unforeseen consequences of that behaviour, force send single modebyte(0x00). Modebyte will be send only if number of dummy-cycles is not equal to 0. Code must also reduce dummycycle byte count by one - as one byte is send as modebyte. Signed-off-by: Witold Sadowski <wsadowski@marvell.com> Link: https://msgid.link/r/20240529074037.1345882-2-wsadowski@marvell.com Signed-off-by: Mark Brown <broonie@kernel.org>
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.