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IQ calibration is used to calibrate RF characteristic to yield expected performance. Basically, we do calibration twice and compare the similarity to determine calibration is good or not, if not we do the third calibration, and then compare with the results of first and second calibration. If it still not similar, IQK is failed. Before doing calibration, we need to backup registers that will be modified in calibration procedure, and restore these registers after calibration is done. A calibration procedure can divided into four sub-procedures that are S1-TX, S1-RX, S0-TX and S0-RX. Where, S1 and S0 represent to path A and B respectively. Each sub-procedure configure proper registers, and then rigger one-shot calibration and poll until completion. For RX calibration, it needs to do twice one-shot calibration, first one is to yield parameter used by second one. The result of TX part is stored for TX power tracking that adjusts TX AGC to output expected power. Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20200512102621.5148-3-yhchuang@realtek.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.