[PATCH 5/5] ALSA: hda/i915: extend connectivity check to cover Intel ARL

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

From: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Expand the HDA/I915 connectivity check to correctly handle
the PCI topology used in some Intel Arrow Lake products.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Tested-by: "T, Arun" <arun.t@intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/hda/hdac_i915.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index 2a451ff4fe6a..b428537f284c 100644
--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -75,16 +75,22 @@ static bool connectivity_check(struct pci_dev *i915, struct pci_dev *hdac)
 	if (bus_a == bus_b)
 		return true;
 
+	bus_a = bus_a->parent;
+	bus_b = bus_b->parent;
+
+	/* connected via parent bus (may be NULL!) */
+	if (bus_a == bus_b)
+		return true;
+
+	if (!bus_a || !bus_b)
+		return false;
+
 	/*
 	 * on i915 discrete GPUs with embedded HDA audio, the two
 	 * devices are connected via 2nd level PCI bridge
 	 */
 	bus_a = bus_a->parent;
 	bus_b = bus_b->parent;
-	if (!bus_a || !bus_b)
-		return false;
-	bus_a = bus_a->parent;
-	bus_b = bus_b->parent;
 	if (bus_a && bus_a == bus_b)
 		return true;
 
-- 
2.39.2