HDP_MEM_POWER_LS  650 drivers/gpu/drm/amd/amdgpu/sid.h #define HDP_MEM_POWER_LS				0xBD4
HDP_MEM_POWER_LS  769 drivers/gpu/drm/radeon/cikd.h #define HDP_MEM_POWER_LS				0x2F50
HDP_MEM_POWER_LS  646 drivers/gpu/drm/radeon/sid.h #define HDP_MEM_POWER_LS				0x2F50