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Some cpuidle C-states supported on am335x and am437x, like C1 on am335x, require the use of the wkup_m3_ipc driver, and all C-states beyond C0 on both platforms require the use of the SRAM sleep code. Pass am33xx_do_sram_idle as the idle function to the platform pm core to be used by the cpuidle-arm driver when entering cpuidle states. am33xx_do_sram_idle will detect when the wkup_m3 is needed and ping it if necessary before calling the final cpu_suspend op which will execute the SRAM code to put the cpu into idle. Finally, use the begin_suspend and finish_suspend platform ops to be called at the beginning and end of suspend path to allow use of cpu_idle_poll_ctrl. This prevents races between cpuidle and suspend paths trying to communicate with the wkup_m3, as during suspend we only want it configured for entry to suspend. Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
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.