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Power domains might have parent domains assigned that are automatically managed by the PM domain core. In particular, parent domains are automatically powered on/off and setting performance states on child domains are propagated to parent domains (e.g. using an OPP table from the device tree). Currently the parent performance state is always adjusted before the performance state of the child domain, which is a problem for some cases when scaling down the performance state. More exactly, it may lead to that the parent domain could run in a lower performance state, than what is required by the child domain. To fix the behaviour, let's differentiate between scaling up/down and adjust the order of operations: - When scaling up, parent domains should be adjusted before the child domain. In case of an error, the rollback happens in reverse order. - When scaling down, parent domains should be adjusted after the child domain, in reverse order, just as if we would rollback scaling up. In case of an error, the rollback happens in normal order (just as if we would normally scale up). Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Link: https://lore.kernel.org/r/20240103-genpd-perf-order-v2-1-eeecfc55624b@gerhold.net Tested-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.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.