RADEON_CRTC_V_SYNC_WID_SHIFT
if( v_sync_wid > (RADEON_CRTC_V_SYNC_WID >> RADEON_CRTC_V_SYNC_WID_SHIFT))
v_sync_wid = (RADEON_CRTC_V_SYNC_WID >> RADEON_CRTC_V_SYNC_WID_SHIFT);
| (vsync_wid << RADEON_CRTC_V_SYNC_WID_SHIFT)
>> RADEON_CRTC_V_SYNC_WID_SHIFT);