RADEON_VIPH_CONTROL
WREG32(RADEON_VIPH_CONTROL, 0);
viph_control = RREG32(RADEON_VIPH_CONTROL);
WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
WREG32(RADEON_VIPH_CONTROL, viph_control);
viph_control = RREG32(RADEON_VIPH_CONTROL);
WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
WREG32(RADEON_VIPH_CONTROL, viph_control);
viph_control = RREG32(RADEON_VIPH_CONTROL);
WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
WREG32(RADEON_VIPH_CONTROL, viph_control);
viph_control = RREG32(RADEON_VIPH_CONTROL);
WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
WREG32(RADEON_VIPH_CONTROL, viph_control);