CAYMAN_DMA1_CNTL
tmp = RREG32(CAYMAN_DMA1_CNTL) & ~TRAP_ENABLE;
WREG32(CAYMAN_DMA1_CNTL, tmp);
dma_cntl1 = RREG32(CAYMAN_DMA1_CNTL) & ~TRAP_ENABLE;
WREG32(CAYMAN_DMA1_CNTL, dma_cntl1);