UVD_RBC_IB_BASE__IB_BASE__SHIFT  589 drivers/gpu/drm/amd/include/asic_reg/uvd/uvd_4_0_sh_mask.h #define UVD_RBC_IB_BASE__IB_BASE__SHIFT 0x00000006
UVD_RBC_IB_BASE__IB_BASE__SHIFT  606 drivers/gpu/drm/amd/include/asic_reg/uvd/uvd_4_2_sh_mask.h #define UVD_RBC_IB_BASE__IB_BASE__SHIFT 0x6