drm/nouveau/disp: add hdmi audio hal function

This just adds a hook for RM to use, HW paths remain untouched, but
should probably be cleaned up to use this too at some point.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-26-lyude@redhat.com

drivers/gpu/drm/nouveau/nvkm/engine/disp/ior.h

@@ -74,6 +74,7 @@ struct nvkm_ior_func {
 			     bool scrambling_low_rates);
 		void (*infoframe_avi)(struct nvkm_ior *, int head, void *data, u32 size);
 		void (*infoframe_vsi)(struct nvkm_ior *, int head, void *data, u32 size);
+		void (*audio)(struct nvkm_ior *, int head, bool enable);
 	} *hdmi;
 
 	const struct nvkm_ior_func_dp {

drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c

@@ -99,12 +99,20 @@ nvkm_uoutp_mthd_hda_eld(struct nvkm_outp *outp, void *argv, u32 argc)
 	if (argc && args->v0.data[0]) {
 		if (outp->info.type == DCB_OUTPUT_DP)
 			ior->func->dp->audio(ior, args->v0.head, true);
+		else
+		if (ior->func->hdmi->audio)
+			ior->func->hdmi->audio(ior, args->v0.head, true);
+
 		ior->func->hda->hpd(ior, args->v0.head, true);
 		ior->func->hda->eld(ior, args->v0.head, args->v0.data, argc);
 	} else {
+		ior->func->hda->hpd(ior, args->v0.head, false);
+
 		if (outp->info.type == DCB_OUTPUT_DP)
 			ior->func->dp->audio(ior, args->v0.head, false);
-		ior->func->hda->hpd(ior, args->v0.head, false);
+		else
+		if (ior->func->hdmi->audio)
+			ior->func->hdmi->audio(ior, args->v0.head, false);
 	}
 
 	return 0;