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Operational change to correct for 5.5+ change in trigger order; REVISIT! 

Need to revisit, and do in a different way.

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 2021-04-23 22:55:59 +01:00
parent de70691526
commit e553d4f851
3 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Makefile
View File

@ -14,7 +14,7 @@ ifneq ($(KERNELRELEASE),)
snd-soc-wm8960-objs := wm8960.o
snd-soc-ac108-objs := ac108.o ac101.o
snd-soc-seeed-voicecard-objs := seeed-voicecard.o
snd-soc-seeed-voicecard-objs := seeed-voicecard.o ac101.o
obj-m += snd-soc-wm8960.o

2
ac108.c
View File

@ -1058,7 +1058,7 @@ 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) {
if (!cmd && ac10x->i2c101 && _MASTER_MULTI_CODEC == _MASTER_AC101) {
ac101_trigger(substream, cmd, dai);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
goto __ret;

4
seeed-voicecard.c
View File

@ -198,6 +198,7 @@ static int seeed_voice_card_trigger(struct snd_pcm_substream *substream, int cmd
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *dai = asoc_rtd_to_codec(rtd, 0);
struct ac10x_priv *ac10x = snd_soc_dai_get_drvdata(dai);
struct seeed_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
#if CONFIG_AC10X_TRIG_LOCK
unsigned long flags;
@ -217,6 +218,9 @@ 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 (cmd && ac10x->i2c101 && _MASTER_MULTI_CODEC == _MASTER_AC101) {
ac101_trigger(substream, cmd, dai);
}
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 CONFIG_AC10X_TRIG_LOCK