v4.19.13 snapshot.
diff --git a/include/sound/hda_component.h b/include/sound/hda_component.h
new file mode 100644
index 0000000..78626cd
--- /dev/null
+++ b/include/sound/hda_component.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+// HD-Audio helpers to sync with DRM driver
+
+#ifndef __SOUND_HDA_COMPONENT_H
+#define __SOUND_HDA_COMPONENT_H
+
+#include <drm/drm_audio_component.h>
+
+#ifdef CONFIG_SND_HDA_COMPONENT
+int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable);
+int snd_hdac_display_power(struct hdac_bus *bus, bool enable);
+int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
+ int dev_id, int rate);
+int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
+ bool *audio_enabled, char *buffer, int max_bytes);
+int snd_hdac_acomp_init(struct hdac_bus *bus,
+ const struct drm_audio_component_audio_ops *aops,
+ int (*match_master)(struct device *, void *),
+ size_t extra_size);
+int snd_hdac_acomp_exit(struct hdac_bus *bus);
+int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
+ const struct drm_audio_component_audio_ops *ops);
+#else
+static inline int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
+{
+ return 0;
+}
+static inline int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
+{
+ return 0;
+}
+static inline int snd_hdac_sync_audio_rate(struct hdac_device *codec,
+ hda_nid_t nid, int dev_id, int rate)
+{
+ return 0;
+}
+static inline int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid,
+ int dev_id, bool *audio_enabled,
+ char *buffer, int max_bytes)
+{
+ return -ENODEV;
+}
+static inline int snd_hdac_acomp_init(struct hdac_bus *bus,
+ const struct drm_audio_component_audio_ops *aops,
+ int (*match_master)(struct device *, void *),
+ size_t extra_size)
+{
+ return -ENODEV;
+}
+static inline int snd_hdac_acomp_exit(struct hdac_bus *bus)
+{
+ return 0;
+}
+static inline int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
+ const struct drm_audio_component_audio_ops *ops)
+{
+ return -ENODEV;
+}
+#endif
+
+#endif /* __SOUND_HDA_COMPONENT_H */