drm/msm/mdp5: clip img size to src size

If fb dimensions are larger than what can be scanned out, but the src
dimensions are not, the hw can still handle this.  So clip.

Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/mdp/mdp5/mdp5_plane.c

@@ -771,8 +771,8 @@ static int mdp5_plane_mode_set(struct drm_plane *plane,
 	spin_lock_irqsave(&mdp5_plane->pipe_lock, flags);
 
 	mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_IMG_SIZE(pipe),
-			MDP5_PIPE_SRC_IMG_SIZE_WIDTH(fb->width) |
-			MDP5_PIPE_SRC_IMG_SIZE_HEIGHT(fb->height));
+			MDP5_PIPE_SRC_IMG_SIZE_WIDTH(min(fb->width, src_w)) |
+			MDP5_PIPE_SRC_IMG_SIZE_HEIGHT(min(fb->height, src_h)));
 
 	mdp5_write(mdp5_kms, REG_MDP5_PIPE_SRC_SIZE(pipe),
 			MDP5_PIPE_SRC_SIZE_WIDTH(src_w) |