Backend: refine the geometry function
Backend: refine the geometry function

Signed-off-by: rander <5299db4a9bf784920a3e558099f6736bcd8939e6@intel.com>
Reviewed-by: Ruiling Song <286a174c1339c6eff91abc41c3a1012c95030c95@intel.com>

wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet