ASoC: SOF: Add a route_free op in struct sof_ipc_tplg_ops

IPC4 requires that the widgets be unbound in the firmware before they
are freed. So add a new op in struct sof_ipc_tplg_ops that will be used
to send the IPC to the firmware to unbind widgets.
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220426171743.171061-7-ranjani.sridharan@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-audio.c

@@ -14,11 +14,16 @@
 
 static void sof_reset_route_setup_status(struct snd_sof_dev *sdev, struct snd_sof_widget *widget)
 {
+	const struct sof_ipc_tplg_ops *tplg_ops = sdev->ipc->ops->tplg;
 	struct snd_sof_route *sroute;
 
 	list_for_each_entry(sroute, &sdev->route_list, list)
-		if (sroute->src_widget == widget || sroute->sink_widget == widget)
+		if (sroute->src_widget == widget || sroute->sink_widget == widget) {
+			if (sroute->setup && tplg_ops->route_free)
+				tplg_ops->route_free(sdev, sroute);
+
 			sroute->setup = false;
+		}
 }
 
 int sof_widget_free(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)

sound/soc/sof/sof-audio.h

@@ -146,6 +146,7 @@ struct sof_ipc_tplg_widget_ops {
  *	    initialized to 0.
  * @control: Pointer to the IPC-specific ops for topology kcontrol IO
  * @route_setup: Function pointer for setting up pipeline connections
+ * @route_free: Optional op for freeing pipeline connections.
  * @token_list: List of all tokens supported by the IPC version. The size of the token_list
  *		array should be SOF_TOKEN_COUNT. The unused elements in the array will be
  *		initialized to 0.
@@ -163,6 +164,7 @@ struct sof_ipc_tplg_ops {
 	const struct sof_ipc_tplg_widget_ops *widget;
 	const struct sof_ipc_tplg_control_ops *control;
 	int (*route_setup)(struct snd_sof_dev *sdev, struct snd_sof_route *sroute);
+	int (*route_free)(struct snd_sof_dev *sdev, struct snd_sof_route *sroute);
 	const struct sof_token_info *token_list;
 	int (*control_setup)(struct snd_sof_dev *sdev, struct snd_sof_control *scontrol);
 	int (*control_free)(struct snd_sof_dev *sdev, struct snd_sof_control *scontrol);