From 57ebbcafab0ce8cce4493c6a243ecdd7066e6ef1 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Tue, 6 May 2014 16:56:00 +0800 Subject: [PATCH] ASoC: fsl_esai: Only bypass sck_div for EXTAL source ESAI can only output EXTAL clock source directly. But for FSYS clock source, ESAI can not output it without getting through PSR PM dividers. So this patch adds an extra check in the code. Signed-off-by: Nicolin Chen Signed-off-by: Mark Brown --- sound/soc/fsl/fsl_esai.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c index 35c0b9295a80..c674fd99158b 100644 --- a/sound/soc/fsl/fsl_esai.c +++ b/sound/soc/fsl/fsl_esai.c @@ -258,10 +258,16 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, return -EINVAL; } - if (ratio == 1) { + /* Only EXTAL source can be output directly without using PSR and PM */ + if (ratio == 1 && clksrc == esai_priv->extalclk) { /* Bypass all the dividers if not being needed */ ecr |= tx ? ESAI_ECR_ETO : ESAI_ECR_ERO; goto out; + } else if (ratio < 2) { + /* The ratio should be no less than 2 if using other sources */ + dev_err(dai->dev, "failed to derive required HCK%c rate\n", + tx ? 'T' : 'R'); + return -EINVAL; } ret = fsl_esai_divisor_cal(dai, tx, ratio, false, 0); -- 2.30.2