Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
@@ -786,6 +786,9 @@ static bool vlv_PLL_is_optimal(struct drm_device *dev, int target_freq,
unsigned int best_error_ppm,
unsigned int *error_ppm)
{
+ if (WARN_ON_ONCE(!target_freq))
+ return false;
+
*error_ppm = div_u64(1000000ULL *
abs(target_freq - calculated_clock->dot),
target_freq);