VCE_RB_RPTR      1964 drivers/gpu/drm/amd/amdgpu/sid.h #define VCE_RB_RPTR					0x2018c
VCE_RB_RPTR      2117 drivers/gpu/drm/radeon/cikd.h #define VCE_RB_RPTR			0x2018c
VCE_RB_RPTR      1901 drivers/gpu/drm/radeon/sid.h #define VCE_RB_RPTR					0x2018c