clk: sunxi: rewrite sun9i_a80_get_pll4_factors()
The old implementation of sun9i_a80_get_pll4_factors() has several issues, it checks against 256 / 512 in various places where it should use 255 / 511, it does the wrong thing for low frequencies which are an even multiple of 6 MHz, e.g. if you ask it for 72 MHz it will result in 144 Mhz, and it does not take into account that n must be at least 12. Moreover it is quite hard to read / follow it. This commit rewrites it to be correct in all cases, and makes it much easier to follow the code / to read. Cc: Chen-Yu Tsai <wens@csie.org> Signed-off-by:Hans de Goede <hdegoede@redhat.com> Signed-off-by:
Maxime Ripard <maxime.ripard@free-electrons.com>
parent
7a6fca87
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