ALSA: hda/i915: extend connectivity check to cover Intel ARL

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>
Link: https://lore.kernel.org/r/20230802150105.24604-6-pierre-louis.bossart@linux.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/hda/hdac_i915.c

@@ -75,14 +75,20 @@ static bool connectivity_check(struct pci_dev *i915, struct pci_dev *hdac)
 	if (bus_a == bus_b)
 		return true;
 
-	/*
-	 * 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;
+
+	/* 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_a == bus_b)