Once we've set-up the HDA stream and its format, we currently don't
support additional format changes. We already have a protection in the
.prepare case, but this needs to be added in the hw_params too.
In mixing use cases where two DPCM FEs are connected to the same BE,
if can happen that there are multiple calls to the BE hw_params when
the two FEs are configured simultaneously.
This could alternatively be fixed at the DPCM level but that's a more
intrusive change requiring infrastructure changes: this would need to
be paired with the definition of fixed hw_params at the mixer level.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Rander Wang <rander.wang@xxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
sound/soc/sof/intel/hda-dai.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/sound/soc/sof/intel/hda-dai.c b/sound/soc/sof/intel/hda-dai.c
index 53600c6c29116..9823230d2ef4a 100644
--- a/sound/soc/sof/intel/hda-dai.c
+++ b/sound/soc/sof/intel/hda-dai.c
@@ -336,8 +336,13 @@ static int hda_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
+ struct hdac_ext_stream *hext_stream =
+ snd_soc_dai_get_dma_data(dai, substream);
int ret;
+ if (hext_stream && hext_stream->link_prepared)
+ return 0;
+
ret = hda_link_dma_hw_params(substream, params);
if (ret < 0)
return ret;
--
2.30.2
