ASoC: SOF: topology: set default values to volume control

Currently volume control doesn't have any default values
when it is created. This will cause an issue when PM
kicks in and in resume the non-existing values are
set to firmware.

Signed-off-by: Jaska Uimonen <jaska.uimonen@intel.com>

sound/soc/sof/topology.c

@@ -33,9 +33,12 @@
 /* 40th root of 10 in Q1.16 fixed-point notation*/
 #define VOL_FORTIETH_ROOT_OF_TEN	69419
 /* Volume fractional word length */
+/* Define to 16 sets the volume linear gain value to use Qx.16 format */
 #define VOLUME_FWL	16
 /* 0.5 dB step value in topology TLV */
 #define VOL_HALF_DB_STEP	50
+/* Full volume for default values */
+#define VOL_ZERO_DB	BIT(VOLUME_FWL)
 
 /* TLV data items */
 #define TLV_ITEMS	3
@@ -1193,8 +1196,10 @@ static int sof_widget_load_pga(struct snd_soc_component *scomp, int index,
 	const struct snd_kcontrol_new *kc = NULL;
 	struct soc_mixer_control *sm;
 	struct snd_sof_control *scontrol;
+	struct sof_ipc_ctrl_data *cdata;
 	const unsigned int *p;
 	int ret, tlv[TLV_ITEMS];
+	unsigned int i;
 
 	volume = kzalloc(sizeof(*volume), GFP_KERNEL);
 	if (!volume)
@@ -1258,6 +1263,13 @@ static int sof_widget_load_pga(struct snd_soc_component *scomp, int index,
 		goto err;
 	}
 
+	/* set default volume values to 0dB in control */
+	cdata = scontrol->control_data;
+	for (i = 0; i < scontrol->num_channels; i++) {
+		cdata->chanv[i].channel = i;
+		cdata->chanv[i].value = VOL_ZERO_DB;
+	}
+
 	sof_dbg_comp_config(scomp, &volume->config);
 
 	swidget->private = (void *)volume;