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These helpers configure the ratio between the base clock and the hardware signal used for link synchronization. The SYNCPRD is written before the first sublink is powered-up. The SYNCPU bit is set, but it will only be cleared after the link is powered-up, hence the implementation with a set/wait pattern. These helpers are currently only needed by SoundWire support, where the lock is taken at a higher level, so only the _unlocked versions are exposed for now. Note that the _wait_bit() implementation is similar to previous helpers in drivers/soundwire, but with sleep duration and timeout aligned with hardware recommendations. If desired, this helper could be modified in a second step with e.g. readl_poll_timeout(). Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Rander Wang <rander.wang@intel.com> Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20230404104127.5629-13-peter.ujfalusi@linux.intel.com Signed-off-by: Mark Brown <broonie@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.