drm/i915: Switch to full atomic helpers for plane updates/disable, take two

Switch from our plane update/disable entrypoints to use the full atomic
helpers (which generate a top-level atomic transaction) rather than the
transitional helpers (which only create/manipulate orphaned plane states
independent of a top-level transaction).  Various upcoming work (SKL
scalers, atomic watermarks, etc.) requires a full atomic transaction to
behave properly/cleanly.

Last time we tried this, we had to back out the change because we still
call the drm_plane vfuncs directly from within our legacy modesetting
code.  This potentially results in nested atomic transactions, locking
collisions, and other failures.  To avoid that problem again, we
sidestep the issue by calling the transitional helpers directly (rather
than through a vfunc) when we're nested inside of other legacy
modesetting code.  However this does allow legacy SetPlane() ioctl's to
process an entire drm_atomic_state transaction, which is important for
upcoming patches.

Cc: Chandra Konduru <chandra.konduru@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -5576,7 +5576,7 @@ static void intel_crtc_disable(struct drm_crtc *crtc)
 	dev_priv->display.crtc_disable(crtc);
 	dev_priv->display.off(crtc);
 
-	crtc->primary->funcs->disable_plane(crtc->primary);
+	drm_plane_helper_disable(crtc->primary);
 
 	/* Update computed state. */
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
@@ -11731,7 +11731,7 @@ static int __intel_set_mode(struct drm_crtc *crtc,
 		int vdisplay, hdisplay;
 
 		drm_crtc_get_hv_timing(mode, &hdisplay, &vdisplay);
-		ret = primary->funcs->update_plane(primary, &intel_crtc->base,
+		ret = drm_plane_helper_update(primary, &intel_crtc->base,
 					      fb, 0, 0,
 					      hdisplay, vdisplay,
 					      x << 16, y << 16,
@@ -12286,7 +12286,7 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
 		int vdisplay, hdisplay;
 
 		drm_crtc_get_hv_timing(set->mode, &hdisplay, &vdisplay);
-		ret = primary->funcs->update_plane(primary, set->crtc, set->fb,
+		ret = drm_plane_helper_update(primary, set->crtc, set->fb,
 					      0, 0, hdisplay, vdisplay,
 					      set->x << 16, set->y << 16,
 					      hdisplay << 16, vdisplay << 16);
@@ -12773,8 +12773,8 @@ void intel_plane_destroy(struct drm_plane *plane)
 }
 
 const struct drm_plane_funcs intel_plane_funcs = {
-	.update_plane = drm_plane_helper_update,
-	.disable_plane = drm_plane_helper_disable,
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
 	.destroy = intel_plane_destroy,
 	.set_property = drm_atomic_helper_plane_set_property,
 	.atomic_get_property = intel_plane_atomic_get_property,

drivers/gpu/drm/i915/intel_sprite.c

@@ -1139,7 +1139,7 @@ int intel_plane_restore(struct drm_plane *plane)
 	if (!plane->crtc || !plane->state->fb)
 		return 0;
 
-	return plane->funcs->update_plane(plane, plane->crtc, plane->state->fb,
+	return drm_plane_helper_update(plane, plane->crtc, plane->state->fb,
 				       plane->state->crtc_x, plane->state->crtc_y,
 				       plane->state->crtc_w, plane->state->crtc_h,
 				       plane->state->src_x, plane->state->src_y,