63de79f031
Use the runtime power management core to cause hardware suspend and resume to occur. Enable it in ipa_clock_init() (without autosuspend), and disable it in ipa_clock_exit(). Use ipa_runtime_suspend() as the ->runtime_suspend power operation, and arrange for it to be called by having ipa_clock_get() call pm_runtime_get_sync() when the first clock reference is taken. Similarly, use ipa_runtime_resume() as the ->runtime_resume power operation, and pm_runtime_put() when the last IPA clock reference is dropped. Introduce ipa_runtime_idle() as the ->runtime_idle power operation, and have it return a non-zero value; this way suspend will never occur except when forced. Use pm_runtime_force_suspend() and pm_runtime_force_resume() as the system suspend and resume callbacks, and remove ipa_suspend() and ipa_resume(). Store a pointer to the device structure passed to ipa_clock_init(), so it can be used by ipa_clock_exit() to disable runtime power management. For now we preserve IPA clock reference counting. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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.