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clk: bcm2835: Correct the prediv logic 

If a clock has the prediv flag set, both the integer and fractional
parts must be scaled when calculating the resulting frequency.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Phil Elwell 2017-05-15 10:35:04 -07:00 committed by Stephen Boyd
parent 887541159c
commit e45098d703
1 changed files with 3 additions and 1 deletions
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4
drivers/clk/bcm/clk-bcm2835.c
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@ -616,8 +616,10 @@ static unsigned long bcm2835_pll_get_rate(struct clk_hw *hw,
using_prediv = cprman_read(cprman, data->ana_reg_base + 4) &
data->ana->fb_prediv_mask;
if (using_prediv)
if (using_prediv) {
ndiv *= 2;
fdiv *= 2;
}
return bcm2835_pll_rate_from_divisors(parent_rate, ndiv, fdiv, pdiv);
}