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c326356188
When platform firmware exposes multiple supported bus frequencies, the existing SoundWire support selects the maximum frequency. This is not aligned with the SoundWire 1.2 directions: the MIPI recommendation is to start at a 'safe' speed, compatible with the default frame rate and shape, and only increase the clock when vendor and codec PHY parameters are updated. However, clock changes are not supported for now by the SoundWire core, so in practice this patch has the effect of discarding frequencies different to the implicit default. Dynamic clock changes will be required at some point, and this limitation will be removed after the core is updated, specifically to perform synchronous clock scale changes on manager and peripheral sides with a bank switch. On Intel LunarLake platforms with a 'standard' DSDT, this forces the use of 4.8MHz. On older platforms this patch has no effect. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20240704003411.10347-1-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@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 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.