ASoC: SOF: topology: pass volume min/max linear value to FW

The driver currently passes the volume ramp type and length
topology tokens to firmware, but the min and max volume are
not set. This patch provides a correction to convert the
information from the topology file and pass the linear volume
min/max value to the firmware to improve transitions.
Signed-off-by: Zhu Yingjiang <yingjiang.zhu@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/topology.c

@@ -1552,6 +1552,9 @@ static int sof_widget_load_pga(struct snd_soc_component *scomp, int index,
 	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(scomp);
 	struct snd_soc_tplg_private *private = &tw->priv;
 	struct sof_ipc_comp_volume *volume;
+	struct snd_sof_control *scontrol;
+	int min_step;
+	int max_step;
 	int ret;
 
 	volume = kzalloc(sizeof(*volume), GFP_KERNEL);
@@ -1594,6 +1597,17 @@ static int sof_widget_load_pga(struct snd_soc_component *scomp, int index,
 
 	swidget->private = volume;
 
+	list_for_each_entry(scontrol, &sdev->kcontrol_list, list) {
+		if (scontrol->comp_id == swidget->comp_id) {
+			min_step = scontrol->min_volume_step;
+			max_step = scontrol->max_volume_step;
+			volume->min_value = scontrol->volume_table[min_step];
+			volume->max_value = scontrol->volume_table[max_step];
+			volume->channels = scontrol->num_channels;
+			break;
+		}
+	}
+
 	ret = sof_ipc_tx_message(sdev->ipc, volume->comp.hdr.cmd, volume,
 				 sizeof(*volume), r, sizeof(*r));
 	if (ret >= 0)