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Audio DSP device supports D0 substates in form of D0ix, allowing for preserving more power even when device is still considered active (D0). When entered, certain domains which are not being currently used become power gated. Entering and leaving D0ix is a complex process and differs between firmware generations. Conditions that disallow D0i3 and require immediate D0i0 transition include but may not be limited to: IPC traffic, firmware tracing and SRAM I/O. To make D0ix toggling sane, delay D0i3 transition and refresh the timer each time an IPC is requested. Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com> Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com> Link: https://lore.kernel.org/r/20220516101116.190192-9-cezary.rojewski@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.