4.4-stable review patch. If anyone has any objections, please let me know.
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From: Nicolin Chen nicoleotsuka@gmail.com
commit c656941df9bc80f7ec65b92ca73c42f8b0b62628 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- sound/soc/fsl/fsl_esai.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/sound/soc/fsl/fsl_esai.c +++ b/sound/soc/fsl/fsl_esai.c @@ -143,6 +143,13 @@ static int fsl_esai_divisor_cal(struct s
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;