[PATCH 2/4] ASoC: SOF: ipc4-topology: Fix the output reference params for SRC

[Peter Ujfalusi <peter.ujfalusi@linux.intel.com>]

From: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

For playback, the SRC sink rate must be configured based on the requested
output format which is restricted to only handle DAI's that support a
single audio format for now. For capture, the SRC module should convert
the rate to match the rate requested by the PCM hw_params.

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>
Reviewed-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/sof/ipc4-topology.c | 40 ++++++++++++++++++++++++++---------
 1 file changed, 30 insertions(+), 10 deletions(-)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index 8bc12f12888d..39649fddf16a 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -1839,19 +1839,39 @@ static int sof_ipc4_prepare_src_module(struct snd_sof_widget *swidget,
 	struct sof_ipc4_src *src = swidget->private;
 	struct sof_ipc4_available_audio_format *available_fmt = &src->available_fmt;
 	struct sof_ipc4_audio_format *out_audio_fmt;
-	struct sof_ipc4_audio_format *in_fmt;
+	struct sof_ipc4_audio_format *in_audio_fmt;
 	u32 out_ref_rate, out_ref_channels, out_ref_valid_bits;
-	int ret, output_format_index;
+	int output_format_index, input_format_index;
 
-	ret = sof_ipc4_init_input_audio_fmt(sdev, swidget, &src->base_config,
-					    pipeline_params, available_fmt);
-	if (ret < 0)
-		return ret;
+	input_format_index = sof_ipc4_init_input_audio_fmt(sdev, swidget, &src->base_config,
+							   pipeline_params, available_fmt);
+	if (input_format_index < 0)
+		return input_format_index;
 
-	in_fmt = &available_fmt->input_pin_fmts[ret].audio_fmt;
-	out_ref_rate = in_fmt->sampling_frequency;
-	out_ref_channels = SOF_IPC4_AUDIO_FORMAT_CFG_CHANNELS_COUNT(in_fmt->fmt_cfg);
-	out_ref_valid_bits = SOF_IPC4_AUDIO_FORMAT_CFG_V_BIT_DEPTH(in_fmt->fmt_cfg);
+	/*
+	 * For playback, the SRC sink rate will be configured based on the requested output
+	 * format, which is restricted to only deal with DAI's with a single format for now.
+	 */
+	if (dir == SNDRV_PCM_STREAM_PLAYBACK && available_fmt->num_output_formats > 1) {
+		dev_err(sdev->dev, "Invalid number of output formats: %d for SRC %s\n",
+			available_fmt->num_output_formats, swidget->widget->name);
+		return -EINVAL;
+	}
+
+	/*
+	 * SRC does not perform format conversion, so the output channels and valid bit depth must
+	 * be the same as that of the input.
+	 */
+	in_audio_fmt = &available_fmt->input_pin_fmts[input_format_index].audio_fmt;
+	out_ref_channels = SOF_IPC4_AUDIO_FORMAT_CFG_CHANNELS_COUNT(in_audio_fmt->fmt_cfg);
+	out_ref_valid_bits = SOF_IPC4_AUDIO_FORMAT_CFG_V_BIT_DEPTH(in_audio_fmt->fmt_cfg);
+
+	/*
+	 * For capture, the SRC module should convert the rate to match the rate requested by the
+	 * PCM hw_params. Set the reference params based on the fe_params unconditionally as it
+	 * will be ignored for playback anyway.
+	 */
+	out_ref_rate = params_rate(fe_params);
 
 	output_format_index = sof_ipc4_init_output_audio_fmt(sdev, &src->base_config,
 							     available_fmt, out_ref_rate,
-- 
2.41.0