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[ Upstream commitd8b3e39608] Fix the reset sequence of reads and writes that we invoke from within the early trigger. It looks like there never was a SERDES_CONF_SOME_RST bit that should be involved in the reset sequence, and its presence in the driver code is a mistake from earlier. Instead, the reset sequence should go as follows: We should switch the the SERDES unit's SYNC_SEL mux to the value of 7 (so outside the range of 1...6 representing cluster's SYNCGEN units), then raise the RST bit in SERDES_STATUS and wait for it to clear. Properly resetting the SERDES unit fixes frame desynchronization hazard in case of long frames (longer than 4 used slots). The desynchronization manifests itself by rotating the PCM channels. Fixes:3df5d0d972("ASoC: apple: mca: Start new platform driver") Signed-off-by: Martin Povišer <povik+lin@cutebit.org> Link: https://lore.kernel.org/r/20230224153302.45365-2-povik+lin@cutebit.org Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.