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The current way to implement an always on PM domain consists of returning -EBUSY from the ->power_off() callback. This is a bit different compared to using the always on genpd governor, which prevents the PM domain from being powered off via runtime suspend, but not via system suspend. The approach to return -EBUSY from the ->power_off() callback to support always on PM domains in genpd is suboptimal. That is because it requires genpd to follow the regular execution path of the power off sequence, which ends by invoking the ->power_off() callback. To enable genpd to early abort the power off sequence for always on PM domains, it needs static information about these configurations. Therefore let's add a new genpd configuration flag, GENPD_FLAG_ALWAYS_ON. Users of the new GENPD_FLAG_ALWAYS_ON flag, are by genpd required to make sure the PM domain is powered on before calling pm_genpd_init(). Moreover, users don't need to implement the ->power_off() callback, as genpd doesn't ever invoke it. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.