ASoC: qcom: x1e80100: Support boards with two speakers

Some Qualcomm X1E laptops have only two speakers.  Regardless whether
this sound card driver is suitable for them (we could re-use one for
some older SoC), we should set reasonable channel map depending on the
number of channels, not always 4-speaker setup.

This change is necessary for bringing audio support on Lenovo Thinkpad
T14s with Qualcomm X1E78100 and only two speakers.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: krzk

sound/soc/qcom/x1e80100.c

@@ -95,23 +95,53 @@ static int x1e80100_snd_hw_params(struct snd_pcm_substream *substream,
 	return qcom_snd_sdw_hw_params(substream, params, &data->sruntime[cpu_dai->id]);
 }
 
+static int x1e80100_snd_hw_map_channels(unsigned int *ch_map, int num)
+{
+	switch (num) {
+	case 1:
+		ch_map[0] = PCM_CHANNEL_FC;
+		break;
+	case 2:
+		ch_map[0] = PCM_CHANNEL_FL;
+		ch_map[1] = PCM_CHANNEL_FR;
+		break;
+	case 3:
+		ch_map[0] = PCM_CHANNEL_FL;
+		ch_map[1] = PCM_CHANNEL_FR;
+		ch_map[2] = PCM_CHANNEL_FC;
+		break;
+	case 4:
+		ch_map[0] = PCM_CHANNEL_FL;
+		ch_map[1] = PCM_CHANNEL_LB;
+		ch_map[2] = PCM_CHANNEL_FR;
+		ch_map[3] = PCM_CHANNEL_RB;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int x1e80100_snd_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 	struct x1e80100_snd_data *data = snd_soc_card_get_drvdata(rtd->card);
 	struct sdw_stream_runtime *sruntime = data->sruntime[cpu_dai->id];
-	const unsigned int rx_slot[4] = { PCM_CHANNEL_FL,
-					  PCM_CHANNEL_LB,
-					  PCM_CHANNEL_FR,
-					  PCM_CHANNEL_RB };
+	unsigned int channels = substream->runtime->channels;
+	unsigned int rx_slot[4];
 	int ret;
 
 	switch (cpu_dai->id) {
 	case WSA_CODEC_DMA_RX_0:
 	case WSA_CODEC_DMA_RX_1:
+		ret = x1e80100_snd_hw_map_channels(rx_slot, channels);
+		if (ret)
+			return ret;
+
 		ret = snd_soc_dai_set_channel_map(cpu_dai, 0, NULL,
-						  ARRAY_SIZE(rx_slot), rx_slot);
+						  channels, rx_slot);
 		if (ret)
 			return ret;
 		break;