drm/i915: Fix plane allocation/free functions

Use intel_plane_destroy_state in intel_plane_free to free the state.
Also fix intel_plane_alloc() to use __drm_atomic_helper_plane_reset(),
to get sane defaults from the atomic core.

This is needed to get the correct alpha value and blend mode from the
core, and any new default values added from new properties.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Fixes: b2081525 ("drm/i915: Add plane alpha blending support, v2.")
[mlankhorst: Update commit description to mention alpha blend support]
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181113092804.13304-1-maarten.lankhorst@linux.intel.com

drivers/gpu/drm/i915/intel_atomic_plane.c

@@ -36,29 +36,31 @@
 #include <drm/drm_plane_helper.h>
 #include "intel_drv.h"
 
-/**
- * intel_create_plane_state - create plane state object
- * @plane: drm plane
- *
- * Allocates a fresh plane state for the given plane and sets some of
- * the state values to sensible initial values.
- *
- * Returns: A newly allocated plane state, or NULL on failure
- */
-struct intel_plane_state *
-intel_create_plane_state(struct drm_plane *plane)
+struct intel_plane *intel_plane_alloc(void)
 {
-	struct intel_plane_state *state;
+	struct intel_plane_state *plane_state;
+	struct intel_plane *plane;
 
-	state = kzalloc(sizeof(*state), GFP_KERNEL);
-	if (!state)
-		return NULL;
+	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return ERR_PTR(-ENOMEM);
 
-	state->base.plane = plane;
-	state->base.rotation = DRM_MODE_ROTATE_0;
-	state->scaler_id = -1;
+	plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL);
+	if (!plane_state) {
+		kfree(plane);
+		return ERR_PTR(-ENOMEM);
+	}
 
-	return state;
+	__drm_atomic_helper_plane_reset(&plane->base, &plane_state->base);
+	plane_state->scaler_id = -1;
+
+	return plane;
+}
+
+void intel_plane_free(struct intel_plane *plane)
+{
+	intel_plane_destroy_state(&plane->base, plane->base.state);
+	kfree(plane);
 }
 
 /**

drivers/gpu/drm/i915/intel_drv.h

@@ -2219,8 +2219,6 @@ void intel_pipe_update_end(struct intel_crtc_state *new_crtc_state);
 int intel_plane_check_stride(const struct intel_plane_state *plane_state);
 int intel_plane_check_src_coordinates(struct intel_plane_state *plane_state);
 int chv_plane_check_rotation(const struct intel_plane_state *plane_state);
-struct intel_plane *intel_plane_alloc(void);
-void intel_plane_free(struct intel_plane *plane);
 struct intel_plane *
 skl_universal_plane_create(struct drm_i915_private *dev_priv,
 			   enum pipe pipe, enum plane_id plane_id);
@@ -2282,7 +2280,8 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
 			       struct intel_crtc_state *crtc_state);
 
 /* intel_atomic_plane.c */
-struct intel_plane_state *intel_create_plane_state(struct drm_plane *plane);
+struct intel_plane *intel_plane_alloc(void);
+void intel_plane_free(struct intel_plane *plane);
 struct drm_plane_state *intel_plane_duplicate_state(struct drm_plane *plane);
 void intel_plane_destroy_state(struct drm_plane *plane,
 			       struct drm_plane_state *state);

drivers/gpu/drm/i915/intel_sprite.c

@@ -1983,35 +1983,6 @@ static bool skl_plane_has_ccs(struct drm_i915_private *dev_priv,
 		 plane_id == PLANE_SPRITE0);
 }
 
-struct intel_plane *intel_plane_alloc(void)
-{
-	struct intel_plane_state *plane_state;
-	struct intel_plane *plane;
-
-	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
-	if (!plane)
-		return ERR_PTR(-ENOMEM);
-
-	plane_state = intel_create_plane_state(&plane->base);
-	if (!plane_state) {
-		kfree(plane);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	plane->base.state = &plane_state->base;
-
-	return plane;
-}
-
-void intel_plane_free(struct intel_plane *plane)
-{
-	struct intel_plane_state *plane_state =
-		to_intel_plane_state(plane->base.state);
-
-	kfree(plane_state);
-	kfree(plane);
-}
-
 struct intel_plane *
 skl_universal_plane_create(struct drm_i915_private *dev_priv,
 			   enum pipe pipe, enum plane_id plane_id)