| From f073faa73626f41db7050a69edd5074c53ce6d6c Mon Sep 17 00:00:00 2001 |
| From: Howard Mitchell <hm@hmbedded.co.uk> |
| Date: Fri, 20 Mar 2015 21:13:45 +0000 |
| Subject: ASoC: pcm512x: Fix divide by zero issue |
| |
| From: Howard Mitchell <hm@hmbedded.co.uk> |
| |
| commit f073faa73626f41db7050a69edd5074c53ce6d6c upstream. |
| |
| If den=1 and pllin_rate>20MHz then den and num are adjusted to 0 |
| causing a divide by zero error a few lines further on. Therefore |
| this patch correctly scales num and den such that |
| pllin_rate/den < 20MHz as required in the device data sheet. |
| |
| Signed-off-by: Howard Mitchell <hm@hmbedded.co.uk> |
| Signed-off-by: Mark Brown <broonie@sirena.org.uk> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| sound/soc/codecs/pcm512x.c | 4 ++-- |
| 1 file changed, 2 insertions(+), 2 deletions(-) |
| |
| --- a/sound/soc/codecs/pcm512x.c |
| +++ b/sound/soc/codecs/pcm512x.c |
| @@ -576,8 +576,8 @@ static int pcm512x_find_pll_coeff(struct |
| |
| /* pllin_rate / P (or here, den) cannot be greater than 20 MHz */ |
| if (pllin_rate / den > 20000000 && num < 8) { |
| - num *= 20000000 / (pllin_rate / den); |
| - den *= 20000000 / (pllin_rate / den); |
| + num *= DIV_ROUND_UP(pllin_rate / den, 20000000); |
| + den *= DIV_ROUND_UP(pllin_rate / den, 20000000); |
| } |
| dev_dbg(dev, "num / den = %lu / %lu\n", num, den); |
| |
