ASoC: SOF: ipc4-topology: Handle input/output audio format special case

When there is only one input/output format specified in topology, there
is no need to search for a matching format, simply pick the available
one. This is in preparation to modify and split the selection logic for
the input and output audio formats.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com
Link: https://lore.kernel.org/r/20230515103336.16132-2-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org

sound/soc/sof/ipc4-topology.c

@@ -1039,7 +1039,7 @@ static int sof_ipc4_init_audio_fmt(struct snd_sof_dev *sdev,
 	u32 channels;
 	u32 rate;
 	int sample_valid_bits;
-	int i;
+	int i = 0;
 
 	if (!pin_fmts) {
 		dev_err(sdev->dev, "no reference formats for %s\n", swidget->widget->name);
@@ -1066,6 +1066,10 @@ static int sof_ipc4_init_audio_fmt(struct snd_sof_dev *sdev,
 		return -EINVAL;
 	}
 
+	/* pick the only available input format */
+	if (available_fmt->num_input_formats == 1)
+		goto in_fmt;
+
 	/*
 	 * Search supported audio formats with pin index 0 to match rate, channels ,and
 	 * sample_valid_bytes from runtime params
@@ -1093,6 +1097,7 @@ static int sof_ipc4_init_audio_fmt(struct snd_sof_dev *sdev,
 		return -EINVAL;
 	}
 
+in_fmt:
 	/* copy input format */
 	if (available_fmt->num_input_formats && i < available_fmt->num_input_formats) {
 		memcpy(&base_config->audio_fmt, &available_fmt->input_pin_fmts[i].audio_fmt,
@@ -1105,6 +1110,10 @@ static int sof_ipc4_init_audio_fmt(struct snd_sof_dev *sdev,
 		sof_ipc4_dbg_audio_format(sdev->dev, &available_fmt->input_pin_fmts[i], 1);
 	}
 
+	/* pick the only available output format */
+	if (available_fmt->num_output_formats == 1)
+		i = 0;
+
 	if (available_fmt->num_output_formats && i < available_fmt->num_output_formats)
 		base_config->obs = available_fmt->output_pin_fmts[i].buffer_size;