drm/kms: don't try to shortcut drm mode set function

We have a drm_set_config which takes a crtc/encoder/mode setup,
and checks it to see if it can shortcut and just do a base setup,
or whether a complete mode setting is required.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc_helper.c

@@ -561,7 +561,6 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	int saved_x, saved_y;
 	struct drm_encoder *encoder;
 	bool ret = true;
-	bool depth_changed, bpp_changed;
 
 	adjusted_mode = drm_mode_duplicate(dev, mode);
 
@@ -570,15 +569,6 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	if (!crtc->enabled)
 		return true;
 
-	if (old_fb && crtc->fb) {
-		depth_changed = (old_fb->depth != crtc->fb->depth);
-		bpp_changed = (old_fb->bits_per_pixel !=
-			       crtc->fb->bits_per_pixel);
-	} else {
-		depth_changed = true;
-		bpp_changed = true;
-	}
-
 	saved_mode = crtc->mode;
 	saved_x = crtc->x;
 	saved_y = crtc->y;
@@ -590,15 +580,6 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 	crtc->x = x;
 	crtc->y = y;
 
-	if (drm_mode_equal(&saved_mode, &crtc->mode)) {
-		if (saved_x != crtc->x || saved_y != crtc->y ||
-		    depth_changed || bpp_changed) {
-			ret = !crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y,
-							 old_fb);
-			goto done;
-		}
-	}
-
 	/* Pass our mode to the connectors and the CRTC to give them a chance to
 	 * adjust it according to limitations or connector properties, and also
 	 * a chance to reject the mode entirely.