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a2e617f4e6
The WCD938x codec provides two controls for each of the MIC_BIASn outputs:
- "MIC BIASn" enables an internal regulator to generate the output
with a configurable voltage (qcom,micbiasN-microvolt).
- "VA MIC BIASn" enables "pull-up mode" that bypasses the internal
regulator and directly outputs fixed 1.8V from the VDD_PX pin.
This is intended for low-power VA (voice activation) use cases.
The audio-routing setup for the ThinkPad X13s currently specifies both
as power supplies for the DMICs, but only one of them can be active
at the same time. In practice, only the internal regulator is used
with the current setup because the driver prefers it over pull-up mode.
Make this more clear by dropping the redundant routes to the pull-up
"VA MIC BIASn" supply. There is no functional difference except that we
skip briefly switching to pull-up mode when shutting down the microphone.
Fixes:
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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 reStructuredText 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.