diff options
| author | Nicolin Chen <Guangyu.Chen@freescale.com> | 2014-05-06 16:56:01 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-05-12 23:15:25 +0100 |
| commit | f975ca46f634660a52d8c815b465258ae9bce3b7 (patch) | |
| tree | 781c34ceec8d6463c57f59f8305db607eaca9f0f /sound/soc/fsl/fsl_esai.c | |
| parent | 3e185238a37d1f0a37a1d910344cdcff578bf333 (diff) | |
ASoC: fsl_esai: Bypass divider settings if clock requirement is not changed
We don't need to change those dividers if bclk and mclk remains the same
directions and values.
Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc/fsl/fsl_esai.c')
| -rw-r--r-- | sound/soc/fsl/fsl_esai.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c index 67d5417e0933..0edc837ea3d7 100644 --- a/sound/soc/fsl/fsl_esai.c +++ b/sound/soc/fsl/fsl_esai.c @@ -39,6 +39,8 @@ * @fifo_depth: depth of tx/rx FIFO * @slot_width: width of each DAI slot * @hck_rate: clock rate of desired HCKx clock + * @sck_rate: clock rate of desired SCKx clock + * @hck_dir: the direction of HCKx pads * @sck_div: if using PSR/PM dividers for SCKx clock * @slave_mode: if fully using DAI slave mode * @synchronous: if using tx/rx synchronous mode @@ -55,6 +57,8 @@ struct fsl_esai { u32 fifo_depth; u32 slot_width; u32 hck_rate[2]; + u32 sck_rate[2]; + bool hck_dir[2]; bool sck_div[2]; bool slave_mode; bool synchronous; @@ -213,6 +217,10 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, unsigned long clk_rate; int ret; + /* Bypass divider settings if the requirement doesn't change */ + if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx]) + return 0; + /* sck_div can be only bypassed if ETO/ERO=0 and SNC_SOC_CLOCK_OUT */ esai_priv->sck_div[tx] = true; @@ -272,6 +280,7 @@ static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, esai_priv->sck_div[tx] = false; out: + esai_priv->hck_dir[tx] = dir; esai_priv->hck_rate[tx] = freq; regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR, @@ -289,9 +298,10 @@ static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); u32 hck_rate = esai_priv->hck_rate[tx]; u32 sub, ratio = hck_rate / freq; + int ret; - /* Don't apply for fully slave mode*/ - if (esai_priv->slave_mode) + /* Don't apply for fully slave mode or unchanged bclk */ + if (esai_priv->slave_mode || esai_priv->sck_rate[tx] == freq) return 0; if (ratio * freq > hck_rate) @@ -313,8 +323,15 @@ static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) return -EINVAL; } - return fsl_esai_divisor_cal(dai, tx, ratio, true, + ret = fsl_esai_divisor_cal(dai, tx, ratio, true, esai_priv->sck_div[tx] ? 0 : ratio); + if (ret) + return ret; + + /* Save current bclk rate */ + esai_priv->sck_rate[tx] = freq; + + return 0; } static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask, |