ASoC: SOF: add a helper to get topology configured mclk

Add helper sof_dai_ssp_mclk to get the topology configured MCLK from a
pcm_runtime, return 0 if it is not available, and error if the dai type
is not SSP at the moment.

Export the helper for external use, e.g. from machine drivers.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20210319124950.3853994-1-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/sof.h b/include/sound/sof.h
index 646a655..b93bb80 100644 (file)
--- a/include/sound/sof.h
+++ b/include/sound/sof.h
@@ -103,5 +103,6 @@ struct sof_dev_desc {
 int sof_nocodec_setup(struct device *dev, const struct snd_sof_dsp_ops *ops,
                      int (*pcm_dai_link_fixup)(struct snd_soc_pcm_runtime *rtd,
                                                struct snd_pcm_hw_params *params));
+int sof_dai_get_mclk(struct snd_soc_pcm_runtime *rtd);
 
 #endif

diff --git a/sound/soc/sof/sof-audio.c b/sound/soc/sof/sof-audio.c
index 3277489..928d7a4 100644 (file)
--- a/sound/soc/sof/sof-audio.c
+++ b/sound/soc/sof/sof-audio.c
@@ -434,6 +434,33 @@ struct snd_sof_dai *snd_sof_find_dai(struct snd_soc_component *scomp,
 }
 
 /*
+ * Helper to get SSP MCLK from a pcm_runtime.
+ * Return 0 if not exist.
+ */
+int sof_dai_get_mclk(struct snd_soc_pcm_runtime *rtd)
+{
+       struct snd_soc_component *component =
+               snd_soc_rtdcom_lookup(rtd, SOF_AUDIO_PCM_DRV_NAME);
+       struct snd_sof_dai *dai =
+               snd_sof_find_dai(component, (char *)rtd->dai_link->name);
+
+       /* use the tplg configured mclk if existed */
+       if (!dai || !dai->dai_config)
+               return 0;
+
+       switch (dai->dai_config->type) {
+       case SOF_DAI_INTEL_SSP:
+               return dai->dai_config->ssp.mclk_rate;
+       default:
+               /* not yet implemented for platforms other than the above */
+               dev_err(rtd->dev, "mclk for dai_config->type %d not supported yet!\n",
+                       dai->dai_config->type);
+               return -EINVAL;
+       }
+}
+EXPORT_SYMBOL(sof_dai_get_mclk);
+
+/*
  * SOF Driver enumeration.
  */
 int sof_machine_check(struct snd_sof_dev *sdev)