ASoC: SOF: pm: 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->[pm/tplg] == NULL (treated optional for pm currently)
sdev->ipc->ops->[pm/tplg]->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/20221221102328.9635-9-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/pm.c

@@ -73,8 +73,8 @@ static void sof_cache_debugfs(struct snd_sof_dev *sdev)
 static int sof_resume(struct device *dev, bool runtime_resume)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
-	const struct sof_ipc_pm_ops *pm_ops = sdev->ipc->ops->pm;
-	const struct sof_ipc_tplg_ops *tplg_ops = sdev->ipc->ops->tplg;
+	const struct sof_ipc_pm_ops *pm_ops = sof_ipc_get_ops(sdev, pm);
+	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
 	u32 old_state = sdev->dsp_power_state.state;
 	int ret;
 
@@ -155,7 +155,7 @@ static int sof_resume(struct device *dev, bool runtime_resume)
 	}
 
 	/* restore pipelines */
-	if (tplg_ops->set_up_all_pipelines) {
+	if (tplg_ops && tplg_ops->set_up_all_pipelines) {
 		ret = tplg_ops->set_up_all_pipelines(sdev, false);
 		if (ret < 0) {
 			dev_err(sdev->dev, "Failed to restore pipeline after resume %d\n", ret);
@@ -179,8 +179,8 @@ static int sof_resume(struct device *dev, bool runtime_resume)
 static int sof_suspend(struct device *dev, bool runtime_suspend)
 {
 	struct snd_sof_dev *sdev = dev_get_drvdata(dev);
-	const struct sof_ipc_pm_ops *pm_ops = sdev->ipc->ops->pm;
-	const struct sof_ipc_tplg_ops *tplg_ops = sdev->ipc->ops->tplg;
+	const struct sof_ipc_pm_ops *pm_ops = sof_ipc_get_ops(sdev, pm);
+	const struct sof_ipc_tplg_ops *tplg_ops = sof_ipc_get_ops(sdev, tplg);
 	pm_message_t pm_state;
 	u32 target_state = 0;
 	int ret;
@@ -277,7 +277,7 @@ static int sof_suspend(struct device *dev, bool runtime_suspend)
 
 int snd_sof_dsp_power_down_notify(struct snd_sof_dev *sdev)
 {
-	const struct sof_ipc_pm_ops *pm_ops = sdev->ipc->ops->pm;
+	const struct sof_ipc_pm_ops *pm_ops = sof_ipc_get_ops(sdev, pm);
 
 	/* Notify DSP of upcoming power down */
 	if (sof_ops(sdev)->remove && pm_ops && pm_ops->ctx_save)