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If the machine driver doesn't call snd_soc_dai_set_sysclk() the SCLK is assumed to be sample_rate * sample_bits * 2 (that is, the rate necessary for a standard I2S frame). But 24-bit samples can be sent in either a 24-bit slot or a 32-bit slot. If the PLL is configured for a 24-bit slot, but a 32-bit slot is used, cs42l42 will be overclocked. Ultimately it is the machine driver's responsibilty to call snd_soc_dai_set_sysclk() if SLK will be different from the standard I2S rate. However, it is convenient to assume 32-bit slots to allow this common case without needing special machine driver support. The machine driver then only has to set SCLK if the slots are 24-bit, but if it fails to do this cs42l42 won't be overclocked. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://lore.kernel.org/r/20210805161111.10410-7-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.