ASoC: Intel: sof_sdw: add support for Bluetooth offload

This patch enables BT offload feature on TGL Volteer reference design.
Reviewed-by: Kai Vehmanen <kai.vehmanen@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/20210505163705.305616-8-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw.c

@@ -147,7 +147,9 @@ static const struct dmi_system_id sof_sdw_quirk_table[] = {
 		},
 		.driver_data = (void *)(SOF_SDW_TGL_HDMI |
 					SOF_SDW_PCH_DMIC |
-					SOF_SDW_FOUR_SPK),
+					SOF_SDW_FOUR_SPK |
+					SOF_BT_OFFLOAD_SSP(2) |
+					SOF_SSP_BT_OFFLOAD_PRESENT),
 	},
 	{
 		.callback = sof_sdw_quirk_cb,
@@ -977,6 +979,9 @@ static int sof_card_dai_links_create(struct device *dev,
 	dmic_num = (sof_sdw_quirk & SOF_SDW_PCH_DMIC || mach_params->dmic_num) ? 2 : 0;
 	comp_num += dmic_num;
 
+	if (sof_sdw_quirk & SOF_SSP_BT_OFFLOAD_PRESENT)
+		comp_num++;
+
 	dev_dbg(dev, "sdw %d, ssp %d, dmic %d, hdmi %d", sdw_be_num, ssp_num,
 		dmic_num, ctx->idisp_codec ? hdmi_num : 0);
 
@@ -1162,6 +1167,31 @@ static int sof_card_dai_links_create(struct device *dev,
 		INC_ID(be_id, cpu_id, link_id);
 	}
 
+	if (sof_sdw_quirk & SOF_SSP_BT_OFFLOAD_PRESENT) {
+		int port = (sof_sdw_quirk & SOF_BT_OFFLOAD_SSP_MASK) >>
+				SOF_BT_OFFLOAD_SSP_SHIFT;
+
+		name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d-BT", port);
+		if (!name)
+			return -ENOMEM;
+
+		ssp_components = devm_kzalloc(dev, sizeof(*ssp_components),
+						GFP_KERNEL);
+		if (!ssp_components)
+			return -ENOMEM;
+
+		ssp_components->name = "snd-soc-dummy";
+		ssp_components->dai_name = "snd-soc-dummy-dai";
+
+		cpu_name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d Pin", port);
+		if (!cpu_name)
+			return -ENOMEM;
+
+		cpus[cpu_id].dai_name = cpu_name;
+		init_dai_link(dev, links + link_id, be_id, name, 1, 1,
+				cpus + cpu_id, 1, ssp_components, 1, NULL, NULL);
+	}
+
 	card->dai_link = links;
 	card->num_links = num_links;
 

sound/soc/intel/boards/sof_sdw_common.h

@@ -50,6 +50,13 @@ enum {
 #define SOF_RT715_DAI_ID_FIX		BIT(11)
 #define SOF_SDW_NO_AGGREGATION		BIT(12)
 
+/* BT audio offload: reserve 3 bits for future */
+#define SOF_BT_OFFLOAD_SSP_SHIFT	13
+#define SOF_BT_OFFLOAD_SSP_MASK	(GENMASK(15, 13))
+#define SOF_BT_OFFLOAD_SSP(quirk)	\
+	(((quirk) << SOF_BT_OFFLOAD_SSP_SHIFT) & SOF_BT_OFFLOAD_SSP_MASK)
+#define SOF_SSP_BT_OFFLOAD_PRESENT	BIT(16)
+
 struct sof_sdw_codec_info {
 	const int part_id;
 	const int version_id;