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ADC & I/Q calibrations could take infinite time to comple, since they depend on received frames. In particular the I/Q mismatch calibration requires receiving of OFDM frames for completion. But in the 2.4GHz band, a station could receive only CCK frames for a very long time. And while we wait for the completion of one of the mentioned calibrations, the NF calibration is blocked. Moreover, in some environments, I/Q calibration is unable to complete until a correct noise calibration will be performed due to AGC behaviour. In order to avoid delaying NF calibration on forever, limit the maximum duration of ADCs & I/Q calibrations. If the calibration is not completed within the maximum time, it will be interrupted and a next calibration will be performed. The code that selects the next calibration has been reworked to the loop so incompleted calibration will be respinned later. Ð maximum calibration time of 30 seconds was selected to give the calibration enough time to complete and to not interfere with the long (NF) calibration. Run tested with AR9220. Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20200424004923.17129-7-ryazanov.s.a@gmail.com |
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| README | ||
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.