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efb79de36eStarting with the AST2600 platform, most platfom manufacturers have adopted more complex board designs and signal routing, making SPI timing calibration increasingly sensitive and critical. Previously, the driver selected the first "PASS" timing point during calibration, which may not yield the most stable result. This patch introduces a more robust calibration method: - It evaluates all combinations of HCLK sample point delay and DI input delay. The results are stored in a 2D buffer for further comparison. - Because the timing delay behavior is non-linear across HCLK sample points, the optimal timing point is selected as the center of the longest consecutive "PASS" interval within a single HCLK sample point row. This approach ensures better stability and precision in SPI read timing, especially under complex signal integrity conditions. Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com> Link: https://patch.msgid.link/20251001112605.1130723-3-chin-ting_kuo@aspeedtech.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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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.