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clk: sunxi: fix some calculations

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Some divisor calculations were misrounded, causing higher than requested
rates on some clocks. Fix them up using DIV_ROUND_UP, and replace one
homebrew instance of it as well with the right macro.

Reported-by: Boris BREZILLON <b.brezillon.dev@gmail.com>
Signed-off-by: Emilio López <emilio@elopez.com.ar>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Emilio López 2014-03-19 15:19:32 -03:00 committed by Mike Turquette
parent 5a8ddf2682
commit 2226013972
1 changed files with 3 additions and 3 deletions
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6
drivers/clk/sunxi/clk-sunxi.c
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@ -299,7 +299,7 @@ static void sun4i_get_apb1_factors(u32 *freq, u32 parent_rate,
if (parent_rate < *freq)
*freq = parent_rate;
parent_rate = (parent_rate + (*freq - 1)) / *freq;
parent_rate = DIV_ROUND_UP(parent_rate, *freq);
/* Invalid rate! */
if (parent_rate > 32)
@ -344,7 +344,7 @@ static void sun4i_get_mod0_factors(u32 *freq, u32 parent_rate,
if (*freq > parent_rate)
*freq = parent_rate;
div = parent_rate / *freq;
div = DIV_ROUND_UP(parent_rate, *freq);
if (div < 16)
calcp = 0;
@ -385,7 +385,7 @@ static void sun7i_a20_get_out_factors(u32 *freq, u32 parent_rate,
if (*freq > parent_rate)
*freq = parent_rate;
div = parent_rate / *freq;
div = DIV_ROUND_UP(parent_rate, *freq);
if (div < 32)
calcp = 0;