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After finishing the playback or recording, the machine driver might call snd_soc_dai_set_pll(codec, pll_id, 0, 0, 0) to stop the internal PLL, but with the codec driver nau8822, it will print error as below: nau8822 0-001a: Unsupported input clock 0 fsl-asoc-card sound-nau8822: failed to stop FLL: -22 Refer to the function wm8962_set_fll() in the codec driver wm8962, if the freq_out is zero, turn off the internal PLL and return 0. Cc: David Lin <ctlin0@nuvoton.com> Cc: John Hsu <kchsu0@nuvoton.com> Cc: Seven Li <wtli@nuvoton.com> Signed-off-by: Hui Wang <hui.wang@canonical.com> Link: https://lore.kernel.org/r/20220530040151.95221-3-hui.wang@canonical.com Signed-off-by: Mark Brown <broonie@kernel.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.