diff --git a/drivers/gpu/drm/apple/av.h b/drivers/gpu/drm/apple/av.h
index 1d710b0f706f36..6d25d83d78d79d 100644
--- a/drivers/gpu/drm/apple/av.h
+++ b/drivers/gpu/drm/apple/av.h
@@ -6,7 +6,7 @@
 //int avep_audiosrv_startlink(struct apple_dcp *dcp, struct dcp_sound_cookie *cookie);
 //int avep_audiosrv_stoplink(struct apple_dcp *dcp);
 
-/* dcp.c: the opt-in to DP/HDMI audio (appledrm.hdmi_audio). */
+/* dcp.c: DP/HDMI audio, on unless appledrm.hdmi_audio=0. */
 extern bool hdmi_audio;
 
 #if IS_ENABLED(CONFIG_DRM_APPLE_AUDIO)
diff --git a/drivers/gpu/drm/apple/dcp.c b/drivers/gpu/drm/apple/dcp.c
index 4c13e82ea60165..8c0c29b8edeb41 100644
--- a/drivers/gpu/drm/apple/dcp.c
+++ b/drivers/gpu/drm/apple/dcp.c
@@ -200,9 +200,9 @@ module_param(t6030_show_notch, bool, 0444);
 MODULE_PARM_DESC(t6030_show_notch,
 		 "M3 internal display (14.x and 26.6 IOMFB): use the full height and show the notch");
 
-bool hdmi_audio;
+bool hdmi_audio = true;
 module_param(hdmi_audio, bool, 0644);
-MODULE_PARM_DESC(hdmi_audio, "Enable unstable HDMI audio support");
+MODULE_PARM_DESC(hdmi_audio, "Enable DP/HDMI audio support (default: on)");
 
 static bool unstable_edid = true;
 module_param(unstable_edid, bool, 0644);
@@ -2535,7 +2535,7 @@ int dcp_start(struct platform_device *pdev)
 
 /*
  * A native T6030 external processor: its DP/HDMI audio endpoint (EP 0x29)
- * on the driver's opt-in (hdmi_audio), as the other DCPs start it, for a
+ * unless hdmi_audio is off, as the other DCPs start it, for a
  * processor whose port@0 links an audio device; once per session, and after
  * the first display's EDID was read: with the endpoint's interfaces
  * published, an EDID copy (dcpavserv_copy_edid()) has the firmware rebuild