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ASoC: qcom: lpass-cpu: Fix pop noise during audio capture begin 

This patch fixes PoP noise of around 15ms observed during audio
capture begin.
Enables BCLK and LRCLK in snd_soc_dai_ops prepare call for
introducing some delay before capture start.

(am from https://patchwork.kernel.org/patch/12276369/)
(also found at https://lore.kernel.org/r/20210524142114.18676-1-srivasam@codeaurora.org)

Co-developed-by: Judy Hsiao <judyhsiao@chromium.org>
Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Signed-off-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210604154545.1198337-1-judyhsiao@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Srinivasa Rao Mandadapu 2021-06-04 23:45:45 +08:00 committed by Mark Brown
parent 49783c6f4a
commit c8a4556d98
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 83 additions and 0 deletions
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79
sound/soc/qcom/lpass-cpu.c
View File

@ -93,8 +93,30 @@ static void lpass_cpu_daiops_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
struct lpaif_i2sctl *i2sctl = drvdata->i2sctl;
unsigned int id = dai->driver->id;
clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
/*
* Ensure LRCLK is disabled even in device node validation.
* Will not impact if disabled in lpass_cpu_daiops_trigger()
* suspend.
*/
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
regmap_fields_write(i2sctl->spken, id, LPAIF_I2SCTL_SPKEN_DISABLE);
else
regmap_fields_write(i2sctl->micen, id, LPAIF_I2SCTL_MICEN_DISABLE);
/*
* BCLK may not be enabled if lpass_cpu_daiops_prepare is called before
* lpass_cpu_daiops_shutdown. It's paired with the clk_enable in
* lpass_cpu_daiops_prepare.
*/
if (drvdata->mi2s_was_prepared[dai->driver->id]) {
drvdata->mi2s_was_prepared[dai->driver->id] = false;
clk_disable(drvdata->mi2s_bit_clk[dai->driver->id]);
}
clk_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]);
}
@ -275,6 +297,18 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
/*
* Ensure lpass BCLK/LRCLK is enabled during
* device resume as lpass_cpu_daiops_prepare() is not called
* after the device resumes. We don't check mi2s_was_prepared before
* enable/disable BCLK in trigger events because:
* 1. These trigger events are paired, so the BCLK
* enable_count is balanced.
* 2. the BCLK can be shared (ex: headset and headset mic),
* we need to increase the enable_count so that we don't
* turn off the shared BCLK while other devices are using
* it.
*/
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
ret = regmap_fields_write(i2sctl->spken, id,
LPAIF_I2SCTL_SPKEN_ENABLE);
@ -296,6 +330,10 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
/*
* To ensure lpass BCLK/LRCLK is disabled during
* device suspend.
*/
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
ret = regmap_fields_write(i2sctl->spken, id,
LPAIF_I2SCTL_SPKEN_DISABLE);
@ -315,12 +353,53 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
return ret;
}
static int lpass_cpu_daiops_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
struct lpaif_i2sctl *i2sctl = drvdata->i2sctl;
unsigned int id = dai->driver->id;
int ret;
/*
* Ensure lpass BCLK/LRCLK is enabled bit before playback/capture
* data flow starts. This allows other codec to have some delay before
* the data flow.
* (ex: to drop start up pop noise before capture starts).
*/
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
ret = regmap_fields_write(i2sctl->spken, id, LPAIF_I2SCTL_SPKEN_ENABLE);
else
ret = regmap_fields_write(i2sctl->micen, id, LPAIF_I2SCTL_MICEN_ENABLE);
if (ret) {
dev_err(dai->dev, "error writing to i2sctl reg: %d\n", ret);
return ret;
}
/*
* Check mi2s_was_prepared before enabling BCLK as lpass_cpu_daiops_prepare can
* be called multiple times. It's paired with the clk_disable in
* lpass_cpu_daiops_shutdown.
*/
if (!drvdata->mi2s_was_prepared[dai->driver->id]) {
ret = clk_enable(drvdata->mi2s_bit_clk[id]);
if (ret) {
dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret);
return ret;
}
drvdata->mi2s_was_prepared[dai->driver->id] = true;
}
return 0;
}
const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops = {
.set_sysclk = lpass_cpu_daiops_set_sysclk,
.startup = lpass_cpu_daiops_startup,
.shutdown = lpass_cpu_daiops_shutdown,
.hw_params = lpass_cpu_daiops_hw_params,
.trigger = lpass_cpu_daiops_trigger,
.prepare = lpass_cpu_daiops_prepare,
};
EXPORT_SYMBOL_GPL(asoc_qcom_lpass_cpu_dai_ops);

4
sound/soc/qcom/lpass.h
View File

@ -67,6 +67,10 @@ struct lpass_data {
/* MI2S SD lines to use for playback/capture */
unsigned int mi2s_playback_sd_mode[LPASS_MAX_MI2S_PORTS];
unsigned int mi2s_capture_sd_mode[LPASS_MAX_MI2S_PORTS];
/* The state of MI2S prepare dai_ops was called */
bool mi2s_was_prepared[LPASS_MAX_MI2S_PORTS];
int hdmi_port_enable;
/* low-power audio interface (LPAIF) registers */