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Rates declared in PLL rate tables should match exactly rates calculated from the PLL coefficients. If that is not the case, rate of the PLL's child clock might be set not as expected. For instance, if in the PLL rates table we have a 393216000 Hz entry and the real value as returned by the PLL's recalc_rate callback is 393216003, after setting PLL's clk rate to 393216000 clk_get_rate will return 393216003. If we now attempt to set rate of a PLL's child divider clock to 393216000/2 its rate will be 131072001, rather than 196608000. That is, the divider will be set to 3 instead of 2, because 393216003/2 is greater than 196608000. To fix this issue declared rates are changed to exactly match rates generated by the PLL, as calculated from the P, M, S, K coefficients. Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Acked-by: Tomasz Figa <tomasz.figa@gmail.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.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.