HDMI_ACR_PACKET_CONTROL  538 drivers/gpu/drm/radeon/evergreend.h #define HDMI_ACR_PACKET_CONTROL              0x703c
HDMI_ACR_PACKET_CONTROL  693 drivers/gpu/drm/radeon/rv770d.h #define HDMI_ACR_PACKET_CONTROL              0x740c