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28ee08cef4
The I2S0_8CH_MCLKOUT clock rate on Rock 5B board defaults to 12 MHz and
it is used to provide the master clock (MCLK) for the ES8316 audio
codec.
On sound card initialization, this limits the allowed sample rates
according to the MCLK/LRCK ratios supported by the codec, which results
in the following non-standard rates: 15625, 30000, 31250, 46875.
Hence, the very first access of the sound card fails:
Broken configuration for playback: no configurations available: Invalid argument
Setting of hwparams failed: Invalid argument
However, all subsequent attempts will succeed, as the audio graph card
will request a correct clock frequency, based on the stream sample rate
and the multiplication factor.
Assign MCLK to 12.288 MHz, which allows the codec to advertise most of
the standard sample rates.
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 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.