ASoC: Intel: sof_rt5682: add support for systems without i915 audio

Add support to systems where iDisp HDMI/DP audio codec is disabled for some
reason, switch codecs to SoC dummy in the affected DAI links. This allows
to reuse existing topologies as hdmi_num is 3 by default.
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220120230226.175906-2-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_rt5682.c

@@ -81,6 +81,7 @@ struct sof_card_private {
 	struct snd_soc_jack sof_headset;
 	struct list_head hdmi_pcm_list;
 	bool common_hdmi_codec_drv;
+	bool idisp_codec;
 };
 
 static int sof_rt5682_quirk_cb(const struct dmi_system_id *id)
@@ -417,7 +418,7 @@ static int sof_card_late_probe(struct snd_soc_card *card)
 	int i = 0;
 
 	/* HDMI is not supported by SOF on Baytrail/CherryTrail */
-	if (is_legacy_cpu)
+	if (is_legacy_cpu || !ctx->idisp_codec)
 		return 0;
 
 	if (list_empty(&ctx->hdmi_pcm_list))
@@ -558,11 +559,14 @@ static struct snd_soc_dai_link_component dummy_component[] = {
 	}
 };
 
+#define IDISP_CODEC_MASK	0x4
+
 static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 							  int ssp_codec,
 							  int ssp_amp,
 							  int dmic_be_num,
-							  int hdmi_num)
+							  int hdmi_num,
+							  bool idisp_codec)
 {
 	struct snd_soc_dai_link_component *idisp_components;
 	struct snd_soc_dai_link_component *cpus;
@@ -676,6 +680,7 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 		if (!links[id].cpus->dai_name)
 			goto devm_err;
 
+		if (idisp_codec) {
 			idisp_components[i - 1].name = "ehdaudio0D2";
 			idisp_components[i - 1].dai_name = devm_kasprintf(dev,
 									  GFP_KERNEL,
@@ -683,6 +688,10 @@ static struct snd_soc_dai_link *sof_card_dai_links_create(struct device *dev,
 									  i);
 			if (!idisp_components[i - 1].dai_name)
 				goto devm_err;
+		} else {
+			idisp_components[i - 1].name = "snd-soc-dummy";
+			idisp_components[i - 1].dai_name = "snd-soc-dummy-dai";
+		}
 
 		links[id].codecs = &idisp_components[i - 1];
 		links[id].num_codecs = 1;
@@ -838,6 +847,9 @@ static int sof_audio_probe(struct platform_device *pdev)
 		/* default number of HDMI DAI's */
 		if (!hdmi_num)
 			hdmi_num = 3;
+
+		if (mach->mach_params.codec_mask & IDISP_CODEC_MASK)
+			ctx->idisp_codec = true;
 	}
 
 	/* need to get main clock from pmc */
@@ -892,7 +904,7 @@ static int sof_audio_probe(struct platform_device *pdev)
 		sof_audio_card_rt5682.num_links++;
 
 	dai_links = sof_card_dai_links_create(&pdev->dev, ssp_codec, ssp_amp,
-					      dmic_be_num, hdmi_num);
+					      dmic_be_num, hdmi_num, ctx->idisp_codec);
 	if (!dai_links)
 		return -ENOMEM;