Howard Mitchell wrote;
> 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.
Yep, the old code is plain broken and never actually ran, we have been
using 16MHz pllin_rate, and I apparently never hit this code path.
> Signed-off-by: Howard Mitchell <hm@xxxxxxxxxxxxxx>
Acked-by: Peter Rosin <peda@xxxxxxxxxx>
Cheers,
Peter
> ---
> sound/soc/codecs/pcm512x.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/sound/soc/codecs/pcm512x.c b/sound/soc/codecs/pcm512x.c
> index 5301c4a..8472099 100644
> --- a/sound/soc/codecs/pcm512x.c
> +++ b/sound/soc/codecs/pcm512x.c
> @@ -713,8 +713,8 @@ static int pcm512x_find_pll_coeff(struct snd_soc_dai
> *dai,
>
> /* 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);
>
> --
> 1.7.9.5
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