ALSA: hda: intel-sdw-acpi: go through HDAS ACPI at max depth of 2

In the HDAS ACPI scope, the SoundWire may not be the direct child of HDAS.
It needs to go through the ACPI table at max depth of 2 to find the
SoundWire device from HDAS.

Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20211221010817.23636-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/hda/intel-sdw-acpi.c b/sound/hda/intel-sdw-acpi.c
index ba8a872a290107ae2041daf706530c295ab849cd..b7758dbe23714a98752f572899a178efd3f7e06c 100644 (file)
--- a/sound/hda/intel-sdw-acpi.c
+++ b/sound/hda/intel-sdw-acpi.c
@@ -165,8 +165,14 @@ int sdw_intel_acpi_scan(acpi_handle *parent_handle,
        acpi_status status;
 
        info->handle = NULL;
+       /*
+        * In the HDAS ACPI scope, 'SNDW' may be either the child of
+        * 'HDAS' or the grandchild of 'HDAS'. So let's go through
+        * the ACPI from 'HDAS' at max depth of 2 to find the 'SNDW'
+        * device.
+        */
        status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
-                                    parent_handle, 1,
+                                    parent_handle, 2,
                                     sdw_intel_acpi_cb,
                                     NULL, info, NULL);
        if (ACPI_FAILURE(status) || info->handle == NULL)