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A bug recently affected the Tegra30 where calling clk_set_rate_range() on a clock would make it change its rate to the minimum. This was due to the clock in question being a mux that was orphan at registration, which lead to the clk_core req_rate being 0, and the clk_set_rate_range() function then calling clk_set_rate() with req_rate, effectively making that clock running at the minimum rate allowed, even though the initial rate was within that range. Make a test suite to create a mux initially orphan, and then make sure that if our clock rate was initially within a given range, then enforcing that range won't affect it. Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20220325161144.1901695-3-maxime@cerno.tech Signed-off-by: Stephen Boyd <sboyd@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.