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| Filename | Latest commit message | Latest commit date |
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b3e3759ee4
The OPP table normally contains 'fmax' values corresponding to the voltage or performance levels of each OPP, but we don't necessarily want all the devices to run at fmax all the time. Running at fmax makes sense for devices like CPU/GPU, which have a finite amount of work to do and since a specific amount of energy is consumed at an OPP, its better to run at the highest possible frequency for that voltage value. On the other hand, we have IO devices which need to run at specific frequencies only for their proper functioning, instead of maximum possible frequency. The OPP core currently roundup to the next possible OPP for a frequency and select the fmax value. To support the IO devices by the OPP core, lets do the roundup to fetch the voltage or performance state values, but not use the OPP frequency value. Rather use the value returned by clk_round_rate(). The current user, cpufreq, of dev_pm_opp_set_rate() already does the rounding to the next OPP before calling this routine and it won't have any side affects because of this change. Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org> [ Viresh: Massaged changelog, added comment and use temp_opp variable instead ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> |
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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.