CB_DEBUG_BUS_15__SURF_SYNC_START__SHIFT  787 drivers/gpu/drm/amd/include/asic_reg/gca/gfx_6_0_sh_mask.h #define CB_DEBUG_BUS_15__SURF_SYNC_START__SHIFT 0x00000002
CB_DEBUG_BUS_15__SURF_SYNC_START__SHIFT  936 drivers/gpu/drm/amd/include/asic_reg/gca/gfx_7_2_sh_mask.h #define CB_DEBUG_BUS_15__SURF_SYNC_START__SHIFT 0x2