CG_TACH_CTRL      230 drivers/gpu/drm/amd/amdgpu/sid.h #define CG_TACH_CTRL                                    0x1dc
CG_TACH_CTRL      230 drivers/gpu/drm/radeon/cikd.h #define CG_TACH_CTRL                                    0xC0300070
CG_TACH_CTRL      228 drivers/gpu/drm/radeon/sid.h #define CG_TACH_CTRL                                    0x770