diff options
| author | Shengjiu Wang <shengjiu.wang@nxp.com> | 2020-02-18 10:20:01 +0800 |
|---|---|---|
| committer | Shengjiu Wang <shengjiu.wang@nxp.com> | 2020-02-18 19:11:36 +0800 |
| commit | 92601d2f59da3bdc173e3a01689b056b4ce41187 (patch) | |
| tree | 98e4deeb99485a5c401f3b542f42e60751828e90 | |
| parent | 0fff75cf2abc48ed54d6845322860feb5b4ee6c4 (diff) | |
LF-908-1: fsl_ssi: fix noise issue for master and mono mode
The driver will switch to normal mode for 1 channel, so the slot width
is not fixed to 32 bit in this mode, and even in mono mode, the slot
number is 2.
But if the bit clock calulation still use the bit width=32, and slot
number=1, then it cause the output frameclock is not correct. So there
will be noise in output sound.
This patch is to change the bit clock formula of mono mode to be
2channels * params_width * sample rate.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Viorel Suman <viorel.suman@nxp.com>
| -rwxr-xr-x[-rw-r--r--] | sound/soc/fsl/fsl_ssi.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index e4a38ebd4fc4..ee3df508dbfe 100644..100755 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -698,6 +698,10 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, /* Generate bit clock based on the slot number and slot width */ freq = slots * slot_width * params_rate(hw_params); + /* The slot_width is not fixed to 32 for normal mode */ + if (params_channels(hw_params) == 1) + freq = 2 * params_width(hw_params) * params_rate(hw_params); + /* Don't apply it to any non-baudclk circumstance */ if (IS_ERR(ssi->baudclk)) return -EINVAL; |