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Add BIST support for phy FFE (Feed forward equalizer) setting. The user can configure FFE through the new debugfs interface. FFE is a parameter used for link layer control. It will affect the link quality between the SAS controller and the backplane. In the BIST test, the FFE interface is provided to assist board testers in optimizing link parameters. The modification of the FFE parameter will affect the test after BIST or the normal running of the board. The user should save the initial FFE values and restore them after BIST test is complete. Link: https://lore.kernel.org/r/1598958790-232272-6-git-send-email-john.garry@huawei.com Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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 Restructured Text 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.