ASoC: qcom: audioreach: Add 4 channel support

Add support four channel streams.  Map channel 3 and 4 to left/right
surround ("quad(side)" from ffmpeg standard channel list) to match what
is in qdsp6/q6dsp-common.c driver.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20231130180758.212172-3-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/qdsp6/audioreach.c

@@ -274,6 +274,11 @@ static void audioreach_set_channel_mapping(u8 *ch_map, int num_channels)
 	} else if (num_channels == 2) {
 		ch_map[0] =  PCM_CHANNEL_FL;
 		ch_map[1] =  PCM_CHANNEL_FR;
+	} else if (num_channels == 4) {
+		ch_map[0] =  PCM_CHANNEL_FL;
+		ch_map[1] =  PCM_CHANNEL_FR;
+		ch_map[2] =  PCM_CHANNEL_LS;
+		ch_map[3] =  PCM_CHANNEL_RS;
 	}
 }
 
@@ -843,6 +848,11 @@ static int audioreach_mfc_set_media_format(struct q6apm_graph *graph,
 	} else if (num_channels == 2) {
 		media_format->channel_mapping[0] = PCM_CHANNEL_FL;
 		media_format->channel_mapping[1] = PCM_CHANNEL_FR;
+	} else if (num_channels == 4) {
+		media_format->channel_mapping[0] = PCM_CHANNEL_FL;
+		media_format->channel_mapping[1] = PCM_CHANNEL_FR;
+		media_format->channel_mapping[2] = PCM_CHANNEL_LS;
+		media_format->channel_mapping[3] = PCM_CHANNEL_RS;
 	}
 
 	rc = q6apm_send_cmd_sync(graph->apm, pkt, 0);
@@ -1063,7 +1073,7 @@ static int audioreach_pcm_set_media_format(struct q6apm_graph *graph,
 	int rc, payload_size;
 	struct gpr_pkt *pkt;
 
-	if (num_channels > 2) {
+	if (num_channels > 4) {
 		dev_err(graph->dev, "Error: Invalid channels (%d)!\n", num_channels);
 		return -EINVAL;
 	}
@@ -1117,7 +1127,7 @@ static int audioreach_shmem_set_media_format(struct q6apm_graph *graph,
 	struct gpr_pkt *pkt;
 	void *p;
 
-	if (num_channels > 2) {
+	if (num_channels > 4) {
 		dev_err(graph->dev, "Error: Invalid channels (%d)!\n", num_channels);
 		return -EINVAL;
 	}