From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
The amplifier may provide hardware support for I/V feedback, or alternatively the firmware may generate an echo reference attached to the SSP and dailink used for the amplifier.
To avoid any issues with invalid/NULL substreams in the latter case, always unconditionally set dpcm_capture.
Link: https://github.com/thesofproject/linux/issues/4083 Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Péter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com --- sound/soc/intel/boards/sof_nau8825.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/sound/soc/intel/boards/sof_nau8825.c b/sound/soc/intel/boards/sof_nau8825.c index a800854c2831..6794a0249a9a 100644 --- a/sound/soc/intel/boards/sof_nau8825.c +++ b/sound/soc/intel/boards/sof_nau8825.c @@ -487,8 +487,6 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev, links[id].num_codecs = ARRAY_SIZE(max_98373_components); links[id].init = max_98373_spk_codec_init; links[id].ops = &max_98373_ops; - /* feedback stream */ - links[id].dpcm_capture = 1; } else if (sof_nau8825_quirk & SOF_MAX98360A_SPEAKER_AMP_PRESENT) { max_98360a_dai_link(&links[id]); @@ -506,6 +504,9 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev, links[id].platforms = platform_component; links[id].num_platforms = ARRAY_SIZE(platform_component); links[id].dpcm_playback = 1; + /* feedback stream or firmware-generated echo reference */ + links[id].dpcm_capture = 1; + links[id].no_pcm = 1; links[id].cpus = &cpus[id]; links[id].num_cpus = 1;