ASoC: SOF: Intel: SoundWire: refine ACPI match

We have existing platforms where the wrong machine is selected. We
need to make sure the number of devices reported on a link matches
what we expect for a link descriptor. This helps avoid using the
TGL-RVP configuration for an HP platform or vice-versa, depending on
the order in which they are inserted in the table.
Co-developed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <bard.liao@intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@intel.com>
Link: https://lore.kernel.org/r/20210208233336.59449-9-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/hda.c

@@ -1071,32 +1071,63 @@ static bool link_slaves_found(struct snd_sof_dev *sdev,
 	struct sdw_intel_slave_id *ids = sdw->ids;
 	int num_slaves = sdw->num_slaves;
 	unsigned int part_id, link_id, unique_id, mfg_id;
-	int i, j;
+	int i, j, k;
 
 	for (i = 0; i < link->num_adr; i++) {
 		u64 adr = link->adr_d[i].adr;
+		int reported_part_count = 0;
 
 		mfg_id = SDW_MFG_ID(adr);
 		part_id = SDW_PART_ID(adr);
 		link_id = SDW_DISCO_LINK_ID(adr);
+
+		for (j = 0; j < num_slaves; j++) {
+			/* find out how many identical parts were reported on that link */
+			if (ids[j].link_id == link_id &&
+			    ids[j].id.part_id == part_id &&
+			    ids[j].id.mfg_id == mfg_id)
+				reported_part_count++;
+		}
+
 		for (j = 0; j < num_slaves; j++) {
+			int expected_part_count = 0;
+
 			if (ids[j].link_id != link_id ||
 			    ids[j].id.part_id != part_id ||
 			    ids[j].id.mfg_id != mfg_id)
 				continue;
-			/*
-			 * we have to check unique id
-			 * if there is more than one
-			 * Slave on the link
-			 */
-			unique_id = SDW_UNIQUE_ID(adr);
-			if (link->num_adr == 1 ||
-			    ids[j].id.unique_id == SDW_IGNORED_UNIQUE_ID ||
-			    ids[j].id.unique_id == unique_id) {
-				dev_dbg(bus->dev,
-					"found %x at link %d\n",
-					part_id, link_id);
-				break;
+
+			/* find out how many identical parts are expected */
+			for (k = 0; k < link->num_adr; k++) {
+				u64 adr2 = link->adr_d[i].adr;
+				unsigned int part_id2, link_id2, mfg_id2;
+
+				mfg_id2 = SDW_MFG_ID(adr2);
+				part_id2 = SDW_PART_ID(adr2);
+				link_id2 = SDW_DISCO_LINK_ID(adr2);
+
+				if (link_id2 == link_id &&
+				    part_id2 == part_id &&
+				    mfg_id2 == mfg_id)
+					expected_part_count++;
+			}
+
+			if (reported_part_count == expected_part_count) {
+				/*
+				 * we have to check unique id
+				 * if there is more than one
+				 * Slave on the link
+				 */
+				unique_id = SDW_UNIQUE_ID(adr);
+				if (reported_part_count == 1 ||
+				    ids[j].id.unique_id == unique_id) {
+					dev_dbg(bus->dev, "found %x at link %d\n",
+						part_id, link_id);
+					break;
+				}
+			} else {
+				dev_dbg(bus->dev, "part %x reported %d expected %d on link %d, skipping\n",
+					part_id, reported_part_count, expected_part_count, link_id);
 			}
 		}
 		if (j == num_slaves) {