mmCP_RB0_BASE_HI
WREG32_SOC15(GC, 0, mmCP_RB0_BASE_HI, upper_32_bits(rb_addr));
WREG32(mmCP_RB0_BASE_HI, upper_32_bits(rb_addr));
WREG32(mmCP_RB0_BASE_HI, upper_32_bits(rb_addr));
WREG32_SOC15(GC, 0, mmCP_RB0_BASE_HI, upper_32_bits(rb_addr));