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PLL clock on WM8650 is calculated in the following way:
M * parent [O1] => / P [O2] => / D [O3]
Where O2 is 600MHz >= (M * parent) / P >= 300MHz.
Current algorithm does not met this requirement, so that the
function may return rates which are not supported by the hardware.
This patch fixes the algorithm and simplifies the code, reducing
the calculation time by ~10000 times (according to usermode app) by
removing the nested loops.
Signed-off-by: Roman Volkov <rvolkov@v1ros.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
c03d795bee