ASoC: dpcm: Apply symmetry for DPCM

DPCM does not fully support symmetry attributes. soc_pcm_apply_symmetry()
is skipped in soc_pcm_open() for DPCM, without being applied elsewhere.
So HW parameters cannot be correctly limited, and user space can do
playback/capture at different rates while HW actually does not support it.
soc_pcm_params_symmetry() will return error and the second stream stops.

This patch adds soc_pcm_apply_symmetry() for FE, BE, and codec DAIs
in DPCM path that was skipped in soc_pcm_open().

Signed-off-by: PC Liao <pc.liao@mediatek.com>
Signed-off-by: Koro Chen <koro.chen@mediatek.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index c482322..37de8af 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1616,6 +1616,56 @@ static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
        snd_pcm_stream_unlock_irq(substream);
 }
 
+static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
+                              int stream)
+{
+       struct snd_soc_dpcm *dpcm;
+       struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
+       struct snd_soc_dai *fe_cpu_dai = fe->cpu_dai;
+       int err;
+
+       /* apply symmetry for FE */
+       if (soc_pcm_has_symmetry(fe_substream))
+               fe_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
+
+       /* Symmetry only applies if we've got an active stream. */
+       if (fe_cpu_dai->active) {
+               err = soc_pcm_apply_symmetry(fe_substream, fe_cpu_dai);
+               if (err < 0)
+                       return err;
+       }
+
+       /* apply symmetry for BE */
+       list_for_each_entry(dpcm, &fe->dpcm[stream].be_clients, list_be) {
+               struct snd_soc_pcm_runtime *be = dpcm->be;
+               struct snd_pcm_substream *be_substream =
+                       snd_soc_dpcm_get_substream(be, stream);
+               struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
+               int i;
+
+               if (soc_pcm_has_symmetry(be_substream))
+                       be_substream->runtime->hw.info |= SNDRV_PCM_INFO_JOINT_DUPLEX;
+
+               /* Symmetry only applies if we've got an active stream. */
+               if (rtd->cpu_dai->active) {
+                       err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
+                       if (err < 0)
+                               return err;
+               }
+
+               for (i = 0; i < rtd->num_codecs; i++) {
+                       if (rtd->codec_dais[i]->active) {
+                               err = soc_pcm_apply_symmetry(be_substream,
+                                                            rtd->codec_dais[i]);
+                               if (err < 0)
+                                       return err;
+                       }
+               }
+       }
+
+       return 0;
+}
+
 static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
 {
        struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
@@ -1644,6 +1694,13 @@ static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
        dpcm_set_fe_runtime(fe_substream);
        snd_pcm_limit_hw_rates(runtime);
 
+       ret = dpcm_apply_symmetry(fe_substream, stream);
+       if (ret < 0) {
+               dev_err(fe->dev, "ASoC: failed to apply dpcm symmetry %d\n",
+                       ret);
+               goto unwind;
+       }
+
        dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
        return 0;