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Idle Mode Power Save (IMPS) is a power saving mechanism which when called by wcn36xx will cause the radio hardware to enter power collapse. This particular call maps nicely to a simple conjunction/disjunction around IEEE80211_CONF_CHANGE_IDLE and IEEE80211_CONF_IDLE. Here we enter idle when we are not associated with an AP. The kernel will incrementally toggle idle on/off in the process of trying to establish a connection, thus saving power until we are connected to the AP again, at which point we give way to BMPS if power_save is on. We've validated that with IMPS an apq8039 device which has the wcn36xx module loaded but, has not authenticated with an AP will get to VMIN on suspend and will not without IMPS. Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Tested-by: Benjamin Li <benl@squareup.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/20210909153320.2624649-1-bryan.odonoghue@linaro.org
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.