3 files changed, 41 insertions, 0 deletions
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 68838e843b54..1db4d9d3a3ba 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -222,6 +222,13 @@ static inline bool sdw_intel_sync_check_cmdsync_unlocked(struct sdw_intel *sdw)
 	return false;
 }
 
+static inline int sdw_intel_get_link_count(struct sdw_intel *sdw)
+{
+	if (SDW_INTEL_CHECK_OPS(sdw, get_link_count))
+		return SDW_INTEL_OPS(sdw, get_link_count)(sdw);
+	return 4; /* default on older generations */
+}
+
 /* common bus management */
 int intel_start_bus(struct sdw_intel *sdw);
 int intel_start_bus_after_reset(struct sdw_intel *sdw);
diff --git a/drivers/soundwire/intel_ace2x.c b/drivers/soundwire/intel_ace2x.c
index 781fe0aefa68..fff312c6968d 100644
--- a/drivers/soundwire/intel_ace2x.c
+++ b/drivers/soundwire/intel_ace2x.c
@@ -706,10 +706,30 @@ static void intel_program_sdi(struct sdw_intel *sdw, int dev_num)
 			__func__, sdw->instance, dev_num);
 }
 
+static int intel_get_link_count(struct sdw_intel *sdw)
+{
+	int ret;
+
+	ret = hdac_bus_eml_get_count(sdw->link_res->hbus, true, AZX_REG_ML_LEPTR_ID_SDW);
+	if (!ret) {
+		dev_err(sdw->cdns.dev, "%s: could not retrieve link count\n", __func__);
+		return -ENODEV;
+	}
+
+	if (ret > SDW_INTEL_MAX_LINKS) {
+		dev_err(sdw->cdns.dev, "%s: link count %d exceed max %d\n", __func__, ret, SDW_INTEL_MAX_LINKS);
+		return -EINVAL;
+	}
+
+	return ret;
+}
+
 const struct sdw_intel_hw_ops sdw_intel_lnl_hw_ops = {
 	.debugfs_init = intel_ace2x_debugfs_init,
 	.debugfs_exit = intel_ace2x_debugfs_exit,
 
+	.get_link_count = intel_get_link_count,
+
 	.register_dai = intel_register_dai,
 
 	.check_clock_stop = intel_check_clock_stop,
diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c
index 8807e01cbf7c..d110f2b587d5 100644
--- a/drivers/soundwire/intel_auxdevice.c
+++ b/drivers/soundwire/intel_auxdevice.c
@@ -317,6 +317,20 @@ static int intel_link_probe(struct auxiliary_device *auxdev,
 	bus->link_id = auxdev->id;
 	bus->clk_stop_timeout = 1;
 
+	/*
+	 * paranoia check: make sure ACPI-reported number of links is aligned with
+	 * hardware capabilities.
+	 */
+	ret = sdw_intel_get_link_count(sdw);
+	if (ret < 0) {
+		dev_err(dev, "%s: sdw_intel_get_link_count failed: %d\n", __func__, ret);
+		return ret;
+	}
+	if (ret <= sdw->instance) {
+		dev_err(dev, "%s: invalid link id %d, link count %d\n", __func__, auxdev->id, ret);
+		return -EINVAL;
+	}
+
 	sdw_cdns_probe(cdns);
 
 	/* Set ops */