Recent changes in soc-pcm completely broke basic support for mixers on Intel systems: the filters on BE states prevent the connection of a second mixer input while the back-end is already active.

Rather than reverting the changes, which would be problematic for Tegra systems, this patch suggests an additional filter which will only apply to Tegra systems. This is a temporary solution which will have to be revisited - additional issues have been reported with DPCM.

Fixes: 0c25db3f7621 ('ASoC: soc-pcm: Don't reconnect an already active BE') Suggested-by: Sameer Pujar spujar@nvidia.com 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 --- sound/soc/soc-pcm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index b5825d8d6caa..0aa0ae9703d1 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -1395,7 +1395,13 @@ static int dpcm_add_paths(struct snd_soc_pcm_runtime *fe, int stream, if (!fe->dpcm[stream].runtime && !fe->fe_compr) continue;

- if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && + /* + * Filter for systems with 'component_chaining' enabled. + * This helps to avoid unnecessary re-configuration of an + * already active BE on such systems. + */ + if (fe->card->component_chaining && + (be->dpcm[stream].state != SND_SOC_DPCM_STATE_NEW) && (be->dpcm[stream].state != SND_SOC_DPCM_STATE_CLOSE)) continue;