R600_HIGH_VID_LOWER_GPIO_CNTL
high_vid_lower_gpio_cntl = RREG32(R600_HIGH_VID_LOWER_GPIO_CNTL);
WREG32(R600_HIGH_VID_LOWER_GPIO_CNTL,
WREG32(R600_HIGH_VID_LOWER_GPIO_CNTL, high_vid_lower_gpio_cntl);