To avoid sound clipping when there just one, single CAPTURE stream ongoing, disable L1SEN before it is started. Any PLAYBACK stream or additional CAPTURE allows L1SEN to be re-enabled.
Reviewed-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com --- sound/soc/intel/avs/pcm.c | 77 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 75 insertions(+), 2 deletions(-)
diff --git a/sound/soc/intel/avs/pcm.c b/sound/soc/intel/avs/pcm.c index 4dfc5a1ebb7c..2cafbc392cdb 100644 --- a/sound/soc/intel/avs/pcm.c +++ b/sound/soc/intel/avs/pcm.c @@ -643,6 +643,79 @@ static int avs_dai_fe_prepare(struct snd_pcm_substream *substream, struct snd_so return 0; }
+static void avs_hda_stream_start(struct hdac_bus *bus, struct hdac_ext_stream *host_stream) +{ + struct hdac_stream *first_running = NULL; + struct hdac_stream *pos; + struct avs_dev *adev = hdac_to_avs(bus); + + list_for_each_entry(pos, &bus->stream_list, list) { + if (pos->running) { + if (first_running) + break; /* more than one running */ + first_running = pos; + } + } + + /* + * If host_stream is a CAPTURE stream and will be the only one running, + * disable L1SEN to avoid sound clipping. + */ + if (!first_running) { + if (hdac_stream(host_stream)->direction == SNDRV_PCM_STREAM_CAPTURE) + avs_hda_l1sen_enable(adev, false); + snd_hdac_stream_start(hdac_stream(host_stream)); + return; + } + + snd_hdac_stream_start(hdac_stream(host_stream)); + /* + * If host_stream is the first stream to break the rule above, + * re-enable L1SEN. + */ + if (list_entry_is_head(pos, &bus->stream_list, list) && + first_running->direction == SNDRV_PCM_STREAM_CAPTURE) + avs_hda_l1sen_enable(adev, true); +} + +static void avs_hda_stream_stop(struct hdac_bus *bus, struct hdac_ext_stream *host_stream) +{ + struct hdac_stream *first_running = NULL; + struct hdac_stream *pos; + struct avs_dev *adev = hdac_to_avs(bus); + + list_for_each_entry(pos, &bus->stream_list, list) { + if (pos == hdac_stream(host_stream)) + continue; /* ignore stream that is about to be stopped */ + if (pos->running) { + if (first_running) + break; /* more than one running */ + first_running = pos; + } + } + + /* + * If host_stream is a CAPTURE stream and is the only one running, + * re-enable L1SEN. + */ + if (!first_running) { + snd_hdac_stream_stop(hdac_stream(host_stream)); + if (hdac_stream(host_stream)->direction == SNDRV_PCM_STREAM_CAPTURE) + avs_hda_l1sen_enable(adev, true); + return; + } + + /* + * If by stopping host_stream there is only a single, CAPTURE stream running + * left, disable L1SEN to avoid sound clipping. + */ + if (list_entry_is_head(pos, &bus->stream_list, list) && + first_running->direction == SNDRV_PCM_STREAM_CAPTURE) + avs_hda_l1sen_enable(adev, false); + + snd_hdac_stream_stop(hdac_stream(host_stream)); +} + static int avs_dai_fe_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); @@ -664,7 +737,7 @@ static int avs_dai_fe_trigger(struct snd_pcm_substream *substream, int cmd, stru case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: spin_lock_irqsave(&bus->reg_lock, flags); - snd_hdac_stream_start(hdac_stream(host_stream)); + avs_hda_stream_start(bus, host_stream); spin_unlock_irqrestore(&bus->reg_lock, flags);
/* Timeout on DRSM poll shall not stop the resume so ignore the result. */ @@ -694,7 +767,7 @@ static int avs_dai_fe_trigger(struct snd_pcm_substream *substream, int cmd, stru dev_err(dai->dev, "pause FE path failed: %d\n", ret);
spin_lock_irqsave(&bus->reg_lock, flags); - snd_hdac_stream_stop(hdac_stream(host_stream)); + avs_hda_stream_stop(bus, host_stream); spin_unlock_irqrestore(&bus->reg_lock, flags);
ret = avs_path_reset(data->path);