R600_LOW_VID_LOWER_GPIO_CNTL
low_vid_lower_gpio_cntl = RREG32(R600_LOW_VID_LOWER_GPIO_CNTL);
WREG32(R600_LOW_VID_LOWER_GPIO_CNTL,
WREG32(R600_LOW_VID_LOWER_GPIO_CNTL, low_vid_lower_gpio_cntl);