drm/amd/display: Fix 64-bit division

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_abm.c

@@ -94,7 +94,7 @@ static unsigned int get_current_backlight(struct dce_abm *abm_dce)
 	if (bl_period == 0)
 		bl_period = 0xFFFF;
 
-	current_backlight /= bl_period;
+	current_backlight = div_u64(current_backlight, bl_period);
 	current_backlight = (current_backlight + 1) >> 1;
 
 	current_backlight = (uint64_t)(current_backlight) * bl_period;