mmSDMA0_GFX_CONTEXT_CNTL
data = RREG32(mmSDMA0_GFX_CONTEXT_CNTL);
WREG32(mmSDMA0_GFX_CONTEXT_CNTL, data);
SOC15_REG_OFFSET(SDMA0, 0, mmSDMA0_GFX_CONTEXT_CNTL);