When we have multiple CPU DAIs in a dailink, typically for SoundWire aggregated solutions with amplifiers on multiple links, we only want to allocate one HDaudio stream_tag. The simplest solution is to allocate the hext_stream/stream_tag for the DAI with index 0 in the dailink, and reuse the same stream for all other CPU DAIs.
This assumption relies on serialization of DAIs by the ASoC core, where all CPU DAIs are handled in a loop.
The stream release follows the same idea of releasing the tag for the first DAI only. Ideally we would want the loop to be handled in reverse-order to summetry, but there is no risk of reusing a stream_tag which is no longer valid.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com --- sound/soc/sof/intel/hda-dai-ops.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/sound/soc/sof/intel/hda-dai-ops.c b/sound/soc/sof/intel/hda-dai-ops.c index b66886244f24..9a6d995a8453 100644 --- a/sound/soc/sof/intel/hda-dai-ops.c +++ b/sound/soc/sof/intel/hda-dai-ops.c @@ -145,9 +145,17 @@ static struct hdac_ext_stream *hda_assign_hext_stream(struct snd_sof_dev *sdev, struct snd_soc_dai *cpu_dai, struct snd_pcm_substream *substream) { + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snd_soc_dai *dai; struct hdac_ext_stream *hext_stream;
- hext_stream = hda_link_stream_assign(sof_to_bus(sdev), substream); + /* only allocate a stream_tag for the first DAI in the dailink */ + dai = asoc_rtd_to_cpu(rtd, 0); + if (dai == cpu_dai) + hext_stream = hda_link_stream_assign(sof_to_bus(sdev), substream); + else + hext_stream = snd_soc_dai_get_dma_data(dai, substream); + if (!hext_stream) return NULL;
@@ -160,9 +168,14 @@ static void hda_release_hext_stream(struct snd_sof_dev *sdev, struct snd_soc_dai struct snd_pcm_substream *substream) { struct hdac_ext_stream *hext_stream = hda_get_hext_stream(sdev, cpu_dai, substream); + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snd_soc_dai *dai;
+ /* only release a stream_tag for the first DAI in the dailink */ + dai = asoc_rtd_to_cpu(rtd, 0); + if (dai == cpu_dai) + snd_hdac_ext_stream_release(hext_stream, HDAC_EXT_STREAM_TYPE_LINK); snd_soc_dai_set_dma_data(cpu_dai, substream, NULL); - snd_hdac_ext_stream_release(hext_stream, HDAC_EXT_STREAM_TYPE_LINK); }
static void hda_setup_hext_stream(struct snd_sof_dev *sdev, struct hdac_ext_stream *hext_stream,