ucDPCD_MAX_LINK_RATE 4029 drivers/gpu/drm/amd/include/atombios.h   UCHAR               ucDPCD_MAX_LINK_RATE;             // dpcd 01h
ucDPCD_MAX_LINK_RATE 3538 drivers/gpu/drm/radeon/atombios.h   UCHAR               ucDPCD_MAX_LINK_RATE;             // dpcd 01h