RADEON_CRTC2_PIX_WIDTH_MASK
value = old_crtc2_gen_cntl & ~RADEON_CRTC2_PIX_WIDTH_MASK;
value &= ~RADEON_CRTC2_PIX_WIDTH_MASK;
crtc2_gen_cntl &= ~RADEON_CRTC2_PIX_WIDTH_MASK;
~(RADEON_CRTC2_PIX_WIDTH_MASK | RADEON_CRTC2_EN) );