RADEON_CRTC_H_SYNC_WID_SHIFT
if( h_sync_wid > H_SWID_2PIX( RADEON_CRTC_H_SYNC_WID >> RADEON_CRTC_H_SYNC_WID_SHIFT ) )
h_sync_wid = H_SWID_2PIX( RADEON_CRTC_H_SYNC_WID >> RADEON_CRTC_H_SYNC_WID_SHIFT );
| (hsync_wid << RADEON_CRTC_H_SYNC_WID_SHIFT)
>> RADEON_CRTC_H_SYNC_WID_SHIFT);