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authorNicolin Chen <nicoleotsuka@gmail.com>2018-04-08 16:57:35 -0700
committerMark Brown <broonie@kernel.org>2018-04-12 15:27:02 +0100
commitc656941df9bc80f7ec65b92ca73c42f8b0b62628 (patch)
treeebaaf7bfc627026d58282bd66e7e30a10fe899ed /sound
parent573eda59c772d11fc2b56d525dfb698b0f87ddb3 (diff)
downloadop-kernel-dev-c656941df9bc80f7ec65b92ca73c42f8b0b62628.zip
op-kernel-dev-c656941df9bc80f7ec65b92ca73c42f8b0b62628.tar.gz
ASoC: fsl_esai: Fix divisor calculation failure at lower ratio
When the desired ratio is less than 256, the savesub (tolerance) in the calculation would become 0. This will then fail the loop- search immediately without reporting any errors. But if the ratio is smaller enough, there is no need to calculate the tolerance because PM divisor alone is enough to get the ratio. So a simple fix could be just to set PM directly instead of going into the loop-search. Reported-by: Marek Vasut <marex@denx.de> Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> Tested-by: Marek Vasut <marex@denx.de> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/fsl/fsl_esai.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 40a7004..da8fd98 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -144,6 +144,13 @@ static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8;
+ /* Do not loop-search if PM (1 ~ 256) alone can serve the ratio */
+ if (ratio <= 256) {
+ pm = ratio;
+ fp = 1;
+ goto out;
+ }
+
/* Set the max fluctuation -- 0.1% of the max devisor */
savesub = (psr ? 1 : 8) * 256 * maxfp / 1000;
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