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For some platforms where DA7219 is the DAI clock master, BCLK/WCLK will be set and enabled prior to the codec's hw_params() function being called. It is possible the platform requires a different BCLK configuration than would be chosen by hw_params(), for example S16_LE format needed with a 64-bit frame to satisfy certain devices using the clocks. To handle those kinds of scenarios, the use of clk_round_rate() is now employed as part of hw_params(). If BCLK is already enabled then this function will just return the currently set rate, if it is valid for the desired frame size, so the subsequent call to clk_set_rate() will succeed and nothing changes with regards to clocking. In addition the specific BCLK & WCLK recalc_rate() implementations needed updating to always give back a real value, as those functions are called as part of the clk init code and a real value is needed for the clk_round_rate() call to work as expected. Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Mark Brown <broonie@kernel.org> |
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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.