ASoC: intel: sof_sdw: Set channel map directly from endpoints

The current code evenly distributes the CODEC DAIs across the CPU
DAIs in the DAI link, but this is just an assumption about how the
devices are connected to the host. All the information about which
CODEC is connected to which CPU DAI is contained in the endpoints
datastructures and those structures are already parsed to work out
which CODECs to include in the DAI link. Simply fill in the mapping
from CPUs -> CODECs as we parse through the endpoints structures,
this will ensure that mapping matches the physical layout.
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240326160429.13560-6-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw.c

@@ -1407,19 +1407,6 @@ static int get_slave_info(const struct snd_soc_acpi_link_adr *adr_link,
 	return 0;
 }
 
-static void set_dailink_map(struct snd_soc_dai_link_ch_map *sdw_codec_ch_maps,
-			    int codec_num, int cpu_num)
-{
-	int step;
-	int i;
-
-	step = codec_num / cpu_num;
-	for (i = 0; i < codec_num; i++) {
-		sdw_codec_ch_maps[i].cpu	= i / step;
-		sdw_codec_ch_maps[i].codec	= i;
-	}
-}
-
 static int sof_sdw_rtd_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct sof_sdw_codec_info *codec_info;
@@ -1466,6 +1453,7 @@ static int create_sdw_dailink(struct snd_soc_card *card, int *link_index,
 	struct mc_private *ctx = snd_soc_card_get_drvdata(card);
 	struct device *dev = card->dev;
 	const struct snd_soc_acpi_link_adr *adr_link_next;
+	struct snd_soc_dai_link_ch_map *sdw_codec_ch_maps;
 	struct snd_soc_dai_link_component *codecs;
 	struct snd_soc_dai_link_component *cpus;
 	struct sof_sdw_codec_info *codec_info;
@@ -1488,6 +1476,11 @@ static int create_sdw_dailink(struct snd_soc_card *card, int *link_index,
 	if (!codecs)
 		return -ENOMEM;
 
+	sdw_codec_ch_maps = devm_kcalloc(dev, codec_num,
+					 sizeof(*sdw_codec_ch_maps), GFP_KERNEL);
+	if (!sdw_codec_ch_maps)
+		return -ENOMEM;
+
 	/* generate codec name on different links in the same group */
 	j = adr_index;
 	for (adr_link_next = adr_link; adr_link_next && adr_link_next->num_adr &&
@@ -1521,6 +1514,9 @@ static int create_sdw_dailink(struct snd_soc_card *card, int *link_index,
 			(*codec_conf)->dlc = codecs[codec_dlc_index];
 			(*codec_conf)->name_prefix = adr_link_next->adr_d[j].name_prefix;
 
+			sdw_codec_ch_maps[codec_dlc_index].cpu = i;
+			sdw_codec_ch_maps[codec_dlc_index].codec = codec_dlc_index;
+
 			codec_dlc_index++;
 			(*codec_conf)++;
 		}
@@ -1539,7 +1535,6 @@ static int create_sdw_dailink(struct snd_soc_card *card, int *link_index,
 		*ignore_pch_dmic = true;
 
 	for_each_pcm_streams(stream) {
-		struct snd_soc_dai_link_ch_map *sdw_codec_ch_maps;
 		char *name, *cpu_name;
 		int playback, capture;
 		static const char * const sdw_stream_name[] = {
@@ -1558,11 +1553,6 @@ static int create_sdw_dailink(struct snd_soc_card *card, int *link_index,
 			return -EINVAL;
 		}
 
-		sdw_codec_ch_maps = devm_kcalloc(dev, codec_num,
-						 sizeof(*sdw_codec_ch_maps), GFP_KERNEL);
-		if (!sdw_codec_ch_maps)
-			return -ENOMEM;
-
 		/* create stream name according to first link id */
 		if (append_dai_type) {
 			name = devm_kasprintf(dev, GFP_KERNEL,
@@ -1614,9 +1604,8 @@ static int create_sdw_dailink(struct snd_soc_card *card, int *link_index,
 		 * based on wait_for_completion(), tag them as 'nonatomic'.
 		 */
 		dai_links[*link_index].nonatomic = true;
-
-		set_dailink_map(sdw_codec_ch_maps, codec_num, cpu_dai_num);
 		dai_links[*link_index].ch_maps = sdw_codec_ch_maps;
+
 		ret = set_codec_init_func(card, adr_link, dai_links + (*link_index)++,
 					  playback, group_id, adr_index, dai_index);
 		if (ret < 0) {