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Second/Alternative change to correct for 5.5+ change in trigger order

Browse source 
The idea is the same as the previous attempt: calls ac101_trigger() just
before set_clock(1).

https://github.com/respeaker/seeed-voicecard/issues/290
    6mics / linear 4 mics: fails to record against v5.10 kernel
https://github.com/raspberrypi/linux/issues/4279
    [regression] alsa system call blocks on record between 5.4.83 and 5.5.19

In v5.5,

commit 4378f1fbe924054a09ff0d4e39e1a581b9245252
Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
Date:   Fri Sep 27 10:16:46 2019 +0300

    ASoC: soc-pcm: Use different sequence for start/stop trigger

    On stream stop currently we stop the DMA first followed by the CPU DAI.
    This can cause underflow (playback) or overflow (capture) on the DAI side
    as the DMA is no longer feeding data while the DAI is still active.
    It can be observed easily if the DAI side does not have FIFO (or it is
    disabled) to survive the time while the DMA is stopped, but still can
    happen on relatively slow CPUs when relatively high sampling rate is used:
    the FIFO is drained between the time the DMA is stopped and the DAI is
    stopped.

    It can only fixed by using different sequence within trigger for 'stop' and
    'start':
    case SNDRV_PCM_TRIGGER_START:
    case SNDRV_PCM_TRIGGER_RESUME:
    case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            Trigger order: dai_link, DMA, CPU DAI then the codec

    case SNDRV_PCM_TRIGGER_STOP:
    case SNDRV_PCM_TRIGGER_SUSPEND:
    case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            Trigger order: codec, CPU DAI, DMA then dai_link

    Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
    Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
    Link: https://lore.kernel.org/r/20190927071646.22319-1-peter.ujfalusi@ti.com
    Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Hin-Tak Leung 2021-04-27 01:35:13 +01:00
parent 5793cf6bf0
commit 19067f3333
4 changed files with 17 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
ac101.c
View file

@ -1237,7 +1237,7 @@ int ac101_audio_startup(struct snd_pcm_substream *substream,
}
#if _MASTER_MULTI_CODEC == _MASTER_AC101
static int ac101_set_clock(int y_start_n_stop) {
static int ac101_set_clock(int y_start_n_stop, struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) {
int r;
if (y_start_n_stop) {

16
ac108.c
View file

@ -991,7 +991,7 @@ static int ac108_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) {
/*
* due to miss channels order in cpu_dai, we meed defer the clock starting.
*/
static int ac108_set_clock(int y_start_n_stop) {
static int ac108_set_clock(int y_start_n_stop, struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) {
u8 reg;
int ret = 0;
@ -999,6 +999,9 @@ static int ac108_set_clock(int y_start_n_stop) {
/* spin_lock move to machine trigger */
if (y_start_n_stop && ac10x->i2c101 && _MASTER_MULTI_CODEC == _MASTER_AC101) {
ac101_trigger(substream, cmd, dai);
}
if (y_start_n_stop && ac10x->sysclk_en == 0) {
/* enable lrck clock */
ac10x_read(I2S_CTRL, &reg, ac10x->i2cmap[_MASTER_INDEX]);
@ -1058,13 +1061,6 @@ static int ac108_trigger(struct snd_pcm_substream *substream, int cmd,
snd_pcm_stream_str(substream),
cmd);
if (ac10x->i2c101 && _MASTER_MULTI_CODEC == _MASTER_AC101) {
ac101_trigger(substream, cmd, dai);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
goto __ret;
}
}
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
@ -1083,12 +1079,14 @@ static int ac108_trigger(struct snd_pcm_substream *substream, int cmd,
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (ac10x->i2c101 && _MASTER_MULTI_CODEC == _MASTER_AC101) {
ac101_trigger(substream, cmd, dai);
}
break;
default:
ret = -EINVAL;
}
__ret:
dev_dbg(dai->dev, "%s() stream=%s cmd=%d; finished %d\n",
__FUNCTION__,
snd_pcm_stream_str(substream),

2
ac10x.h
View file

@ -119,7 +119,7 @@ void ac101_shutdown(struct i2c_client *i2c);
int ac101_remove(struct i2c_client *i2c);
/* seeed voice card export */
int seeed_voice_card_register_set_clock(int stream, int (*set_clock)(int));
int seeed_voice_card_register_set_clock(int stream, int (*set_clock)(int, struct snd_pcm_substream *, int, struct snd_soc_dai *));
int ac10x_fill_regcache(struct device* dev, struct regmap* map);

16
seeed-voicecard.c
View file

@ -163,9 +163,9 @@ err:
}
#define _SET_CLOCK_CNT 2
static int (* _set_clock[_SET_CLOCK_CNT])(int y_start_n_stop);
static int (* _set_clock[_SET_CLOCK_CNT])(int y_start_n_stop, struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai);
int seeed_voice_card_register_set_clock(int stream, int (*set_clock)(int)) {
int seeed_voice_card_register_set_clock(int stream, int (*set_clock)(int, struct snd_pcm_substream *, int, struct snd_soc_dai *)) {
if (! _set_clock[stream]) {
_set_clock[stream] = set_clock;
}
@ -182,10 +182,10 @@ static void work_cb_codec_clk(struct work_struct *work)
int r = 0;
if (_set_clock[SNDRV_PCM_STREAM_CAPTURE]) {
r = r || _set_clock[SNDRV_PCM_STREAM_CAPTURE](0);
r = r || _set_clock[SNDRV_PCM_STREAM_CAPTURE](0, NULL, 0, NULL); /* not using 2nd to 4th arg if 1st == 0 */
}
if (_set_clock[SNDRV_PCM_STREAM_PLAYBACK]) {
r = r || _set_clock[SNDRV_PCM_STREAM_PLAYBACK](0);
r = r || _set_clock[SNDRV_PCM_STREAM_PLAYBACK](0, NULL, 0, NULL); /* not using 2nd to 4th arg if 1st == 0 */
}
if (r && priv->try_stop++ < TRY_STOP_MAX) {
@ -217,8 +217,8 @@ static int seeed_voice_card_trigger(struct snd_pcm_substream *substream, int cmd
/* I know it will degrades performance, but I have no choice */
spin_lock_irqsave(&priv->lock, flags);
#endif
if (_set_clock[SNDRV_PCM_STREAM_CAPTURE]) _set_clock[SNDRV_PCM_STREAM_CAPTURE](1);
if (_set_clock[SNDRV_PCM_STREAM_PLAYBACK]) _set_clock[SNDRV_PCM_STREAM_PLAYBACK](1);
if (_set_clock[SNDRV_PCM_STREAM_CAPTURE]) _set_clock[SNDRV_PCM_STREAM_CAPTURE](1, substream, cmd, dai);
if (_set_clock[SNDRV_PCM_STREAM_PLAYBACK]) _set_clock[SNDRV_PCM_STREAM_PLAYBACK](1, substream, cmd, dai);
#if CONFIG_AC10X_TRIG_LOCK
spin_unlock_irqrestore(&priv->lock, flags);
#endif
@ -238,8 +238,8 @@ static int seeed_voice_card_trigger(struct snd_pcm_substream *substream, int cmd
if (0 != schedule_work(&priv->work_codec_clk)) {
}
} else {
if (_set_clock[SNDRV_PCM_STREAM_CAPTURE]) _set_clock[SNDRV_PCM_STREAM_CAPTURE](0);
if (_set_clock[SNDRV_PCM_STREAM_PLAYBACK]) _set_clock[SNDRV_PCM_STREAM_PLAYBACK](0);
if (_set_clock[SNDRV_PCM_STREAM_CAPTURE]) _set_clock[SNDRV_PCM_STREAM_CAPTURE](0, NULL, 0, NULL); /* not using 2nd to 4th arg if 1st == 0 */
if (_set_clock[SNDRV_PCM_STREAM_PLAYBACK]) _set_clock[SNDRV_PCM_STREAM_PLAYBACK](0, NULL, 0, NULL); /* not using 2nd to 4th arg if 1st == 0 */
}
break;
default: