HDMI_AUDIO_PACKET_CONTROL  535 drivers/gpu/drm/radeon/evergreend.h #define HDMI_AUDIO_PACKET_CONTROL            0x7038
HDMI_AUDIO_PACKET_CONTROL  690 drivers/gpu/drm/radeon/rv770d.h #define HDMI_AUDIO_PACKET_CONTROL            0x7408