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193c65ec8e
It is not uncommon for an SDCA Control to have no specified default value in the DisCo. Non-volatile registers with no defaults will not be present in the cache until they are accessed. However, if the first operation user-space performs is a read whilst the device is runtime suspended this read will fail. To avoid such problems we should populate values from the hardware into the cache for all non-volatile readable registers with no defaults. Update the defaults handling to do this cache population since it is iterating over the Controls and happens at a time the hardware is always powered up. Tested-by: Bard Liao <yung-chuan.liao@linux.intel.com> Reviewed-by: Maciej Strozek <mstrozek@opensource.cirrus.com> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Tested-by: Richard Fitzgerald <rf@opensource.cirrus.com> Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://patch.msgid.link/20251120153023.2105663-10-ckeepax@opensource.cirrus.com Reviewed-by: Vinod Koul <vkoul@kernel.org> 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 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.