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Add Energy Detected CCA (EDCCA) mechanism to detect energy on the channel. And EDCCA support adaptivity mode now. From MIC Ordinance Regulating Radio Equipment article 49.20, ETSI EN-300-328 and EN-301-893, the device should be able to dynamically pause TX activity when energy detected on the air. According to ETSI/JP DFS region, driver will set corresponding threshold and stop TX activity if the detected energy exceeds the threshold. For now, we support it on 8822b and 8822c first. By default, EDCCA mechanism is turned on. For ETSI/JP DFS region, it will turn to adaptivity mode. However, with adaptivity, if environment is too noisy, TX may often be halted. So, a debugfs for EDCCA is added. It can show what EDCCA mode is used currently. And EDCCA mechanism can be turned on/off through the debugfs while debugging. Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20210830072014.12250-4-pkshih@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.