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093227bc53
The existing device/fwnode_property_read_bool() helpers only check if the property is present. The MIPI DisCo for SoundWire specification allows properties to be exposed with a value of 'false'. Using the standard helpers to retrieve the MIPI-defined properties causes all kinds of logical inversions leading to loss of functionality - such as jack detection in clock-stop mode broken when the device properties are read in Realtek codec drivers. This patch adds new MIPI/SoundWire helpers which first check if the property is present, and then return the actual value extracted from platform firmware. Modifying the default property handling was considered as a possible solution, but it could lead to other types of logical inversions breaking 'working' setups. Andy Shevchenko also pointed out that DT keeps values in the BE32 format, it's probably best to avoid endianness complications. The path of least resistance was chosen, with MIPI-specific helpers which can be tested and with no side effects outside of the SoundWire subsystem. Closes: https://github.com/thesofproject/linux/issues/5129 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/20241003070650.62787-2-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.