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During suspend flow, sof_suspend will be called and the pm_ops->ctx_save callback notifies DSP of the upcoming power down. Upon receipt of the ctx_save IPC, the DSP will start the D3 transition. Before the DSP enter idle, an interrupt is generated to notify the host of the power state change. Since the host and DSP are two different processors, there could be a race condition, which can be avoided by polling with 1s timeout and 500us intervals Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com> Signed-off-by: YC Hung <yc.hung@mediatek.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20220606210212.146626-6-pierre-louis.bossart@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.