ASoC: SOF: pcm: Extend the optionality of IPC ops to IPC as well

The IPC ops are optional, but they require that the ops struct is to be
allocated with all callbacks set to NULL.

Update the code to extend the optionality to:
sdev->ipc == NULL
sdev->ipc->ops == NULL
sdev->ipc->ops->[pcm] == NULL
sdev->ipc->ops->[pcm]->ops == NULL (treated optional currently)
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20221221102328.9635-5-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/pcm.c

@@ -125,8 +125,8 @@ static int sof_pcm_hw_params(struct snd_soc_component *component,
 {
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	const struct sof_ipc_pcm_ops *pcm_ops = sof_ipc_get_ops(sdev, pcm);
 	struct snd_sof_platform_stream_params platform_params = { 0 };
-	const struct sof_ipc_pcm_ops *pcm_ops = sdev->ipc->ops->pcm;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_sof_pcm *spcm;
 	int ret;
@@ -143,7 +143,7 @@ static int sof_pcm_hw_params(struct snd_soc_component *component,
 	 * Handle repeated calls to hw_params() without free_pcm() in
 	 * between. At least ALSA OSS emulation depends on this.
 	 */
-	if (pcm_ops->hw_free && spcm->prepared[substream->stream]) {
+	if (pcm_ops && pcm_ops->hw_free && spcm->prepared[substream->stream]) {
 		ret = pcm_ops->hw_free(component, substream);
 		if (ret < 0)
 			return ret;
@@ -177,7 +177,7 @@ static int sof_pcm_hw_params(struct snd_soc_component *component,
 			return ret;
 	}
 
-	if (pcm_ops->hw_params) {
+	if (pcm_ops && pcm_ops->hw_params) {
 		ret = pcm_ops->hw_params(component, substream, params, &platform_params);
 		if (ret < 0)
 			return ret;
@@ -196,7 +196,7 @@ static int sof_pcm_hw_free(struct snd_soc_component *component,
 {
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
-	const struct sof_ipc_pcm_ops *pcm_ops = sdev->ipc->ops->pcm;
+	const struct sof_ipc_pcm_ops *pcm_ops = sof_ipc_get_ops(sdev, pcm);
 	struct snd_sof_pcm *spcm;
 	int ret, err = 0;
 
@@ -212,7 +212,7 @@ static int sof_pcm_hw_free(struct snd_soc_component *component,
 		spcm->pcm.pcm_id, substream->stream);
 
 	/* free PCM in the DSP */
-	if (pcm_ops->hw_free && spcm->prepared[substream->stream]) {
+	if (pcm_ops && pcm_ops->hw_free && spcm->prepared[substream->stream]) {
 		ret = pcm_ops->hw_free(component, substream);
 		if (ret < 0)
 			err = ret;
@@ -279,7 +279,7 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 {
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
-	const struct sof_ipc_pcm_ops *pcm_ops = sdev->ipc->ops->pcm;
+	const struct sof_ipc_pcm_ops *pcm_ops = sof_ipc_get_ops(sdev, pcm);
 	struct snd_sof_pcm *spcm;
 	bool reset_hw_params = false;
 	bool free_widget_list = false;
@@ -344,7 +344,7 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 	if (!ipc_first)
 		snd_sof_pcm_platform_trigger(sdev, substream, cmd);
 
-	if (pcm_ops->trigger)
+	if (pcm_ops && pcm_ops->trigger)
 		ret = pcm_ops->trigger(component, substream, cmd);
 
 	/* need to STOP DMA even if trigger IPC failed */
@@ -569,7 +569,7 @@ int sof_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_pa
 	struct snd_sof_dai *dai =
 		snd_sof_find_dai(component, (char *)rtd->dai_link->name);
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
-	const struct sof_ipc_pcm_ops *pcm_ops = sdev->ipc->ops->pcm;
+	const struct sof_ipc_pcm_ops *pcm_ops = sof_ipc_get_ops(sdev, pcm);
 
 	/* no topology exists for this BE, try a common configuration */
 	if (!dai) {
@@ -590,7 +590,7 @@ int sof_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd, struct snd_pcm_hw_pa
 		return 0;
 	}
 
-	if (pcm_ops->dai_link_fixup)
+	if (pcm_ops && pcm_ops->dai_link_fixup)
 		return pcm_ops->dai_link_fixup(rtd, params);
 
 	return 0;