ucDPCD_MAX_DOWNSPREAD 4031 drivers/gpu/drm/amd/include/atombios.h   UCHAR               ucDPCD_MAX_DOWNSPREAD;            // dpcd 03h
ucDPCD_MAX_DOWNSPREAD 3540 drivers/gpu/drm/radeon/atombios.h   UCHAR               ucDPCD_MAX_DOWNSPREAD;            // dpcd 03h