drm/i915: Pass proper old/new states to intel_plane_atomic_check_with_state()

Eliminate plane->state and crtc->state usage from
intel_plane_atomic_check_with_state() and its callers. Instead pass the
proper states in or dig them up from the top level atomic state.

Note that intel_plane_atomic_check_with_state() itself isn't allowed to
use the top level atomic state as there is none when it gets called from
the legacy cursor short circuit path.

v2: Rename some variables for easier comprehension (Maarten)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170823152226.22938-4-ville.syrjala@linux.intel.comReviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

drivers/gpu/drm/i915/intel_atomic_plane.c

@@ -107,7 +107,9 @@ intel_plane_destroy_state(struct drm_plane *plane,
 	drm_atomic_helper_plane_destroy_state(plane, state);
 }
 
-int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
+int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_state,
+					struct intel_crtc_state *crtc_state,
+					const struct intel_plane_state *old_plane_state,
 					struct intel_plane_state *intel_state)
 {
 	struct drm_plane *plane = intel_state->base.plane;
@@ -124,7 +126,7 @@ int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
 	 * anything driver-specific we need to test in that case, so
 	 * just return success.
 	 */
-	if (!intel_state->base.crtc && !plane->state->crtc)
+	if (!intel_state->base.crtc && !old_plane_state->base.crtc)
 		return 0;
 
 	/* Clip all planes to CRTC size, or 0x0 if CRTC is disabled */
@@ -194,16 +196,21 @@ int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
 	else
 		crtc_state->active_planes &= ~BIT(intel_plane->id);
 
-	return intel_plane_atomic_calc_changes(&crtc_state->base, state);
+	return intel_plane_atomic_calc_changes(old_crtc_state,
+					       &crtc_state->base,
+					       old_plane_state,
+					       state);
 }
 
 static int intel_plane_atomic_check(struct drm_plane *plane,
-				    struct drm_plane_state *state)
+				    struct drm_plane_state *new_plane_state)
 {
-	struct drm_crtc *crtc = state->crtc;
-	struct drm_crtc_state *drm_crtc_state;
-
-	crtc = crtc ? crtc : plane->state->crtc;
+	struct drm_atomic_state *state = new_plane_state->state;
+	const struct drm_plane_state *old_plane_state =
+		drm_atomic_get_old_plane_state(state, plane);
+	struct drm_crtc *crtc = new_plane_state->crtc ?: old_plane_state->crtc;
+	const struct drm_crtc_state *old_crtc_state;
+	struct drm_crtc_state *new_crtc_state;
 
 	/*
 	 * Both crtc and plane->crtc could be NULL if we're updating a
@@ -214,29 +221,33 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
 	if (!crtc)
 		return 0;
 
-	drm_crtc_state = drm_atomic_get_existing_crtc_state(state->state, crtc);
-	if (WARN_ON(!drm_crtc_state))
-		return -EINVAL;
+	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
+	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 
-	return intel_plane_atomic_check_with_state(to_intel_crtc_state(drm_crtc_state),
-						   to_intel_plane_state(state));
+	return intel_plane_atomic_check_with_state(to_intel_crtc_state(old_crtc_state),
+						   to_intel_crtc_state(new_crtc_state),
+						   to_intel_plane_state(old_plane_state),
+						   to_intel_plane_state(new_plane_state));
 }
 
 static void intel_plane_atomic_update(struct drm_plane *plane,
 				      struct drm_plane_state *old_state)
 {
+	struct intel_atomic_state *state = to_intel_atomic_state(old_state->state);
 	struct intel_plane *intel_plane = to_intel_plane(plane);
-	struct intel_plane_state *intel_state =
-		to_intel_plane_state(plane->state);
-	struct drm_crtc *crtc = plane->state->crtc ?: old_state->crtc;
+	const struct intel_plane_state *new_plane_state =
+		intel_atomic_get_new_plane_state(state, intel_plane);
+	struct drm_crtc *crtc = new_plane_state->base.crtc ?: old_state->crtc;
+
+	if (new_plane_state->base.visible) {
+		const struct intel_crtc_state *new_crtc_state =
+			intel_atomic_get_new_crtc_state(state, to_intel_crtc(crtc));
 
-	if (intel_state->base.visible) {
 		trace_intel_update_plane(plane,
 					 to_intel_crtc(crtc));
 
 		intel_plane->update_plane(intel_plane,
-					  to_intel_crtc_state(crtc->state),
-					  intel_state);
+					  new_crtc_state, new_plane_state);
 	} else {
 		trace_intel_disable_plane(plane,
 					  to_intel_crtc(crtc));

drivers/gpu/drm/i915/intel_display.c

@@ -10340,7 +10340,7 @@ static bool intel_wm_need_update(struct drm_plane *plane,
 	return false;
 }
 
-static bool needs_scaling(struct intel_plane_state *state)
+static bool needs_scaling(const struct intel_plane_state *state)
 {
 	int src_w = drm_rect_width(&state->base.src) >> 16;
 	int src_h = drm_rect_height(&state->base.src) >> 16;
@@ -10350,7 +10350,9 @@ static bool needs_scaling(struct intel_plane_state *state)
 	return (src_w != dst_w || src_h != dst_h);
 }
 
-int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
+int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_state,
+				    struct drm_crtc_state *crtc_state,
+				    const struct intel_plane_state *old_plane_state,
 				    struct drm_plane_state *plane_state)
 {
 	struct intel_crtc_state *pipe_config = to_intel_crtc_state(crtc_state);
@@ -10359,10 +10361,8 @@ int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
 	struct intel_plane *plane = to_intel_plane(plane_state->plane);
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_plane_state *old_plane_state =
-		to_intel_plane_state(plane->base.state);
 	bool mode_changed = needs_modeset(crtc_state);
-	bool was_crtc_enabled = crtc->state->active;
+	bool was_crtc_enabled = old_crtc_state->base.active;
 	bool is_crtc_enabled = crtc_state->active;
 	bool turn_off, turn_on, visible, was_visible;
 	struct drm_framebuffer *fb = plane_state->fb;
@@ -13162,6 +13162,8 @@ intel_legacy_cursor_update(struct drm_plane *plane,
 	new_plane_state->crtc_h = crtc_h;
 
 	ret = intel_plane_atomic_check_with_state(to_intel_crtc_state(crtc->state),
+						  to_intel_crtc_state(crtc->state), /* FIXME need a new crtc state? */
+						  to_intel_plane_state(plane->state),
 						  to_intel_plane_state(new_plane_state));
 	if (ret)
 		goto out_free;

drivers/gpu/drm/i915/intel_drv.h

@@ -1192,6 +1192,14 @@ hdmi_to_dig_port(struct intel_hdmi *intel_hdmi)
 	return container_of(intel_hdmi, struct intel_digital_port, hdmi);
 }
 
+static inline struct intel_plane_state *
+intel_atomic_get_new_plane_state(struct intel_atomic_state *state,
+				 struct intel_plane *plane)
+{
+	return to_intel_plane_state(drm_atomic_get_new_plane_state(&state->base,
+								   &plane->base));
+}
+
 static inline struct intel_crtc_state *
 intel_atomic_get_old_crtc_state(struct intel_atomic_state *state,
 				struct intel_crtc *crtc)
@@ -1419,7 +1427,9 @@ int intel_plane_atomic_set_property(struct drm_plane *plane,
 				    struct drm_plane_state *state,
 				    struct drm_property *property,
 				    uint64_t val);
-int intel_plane_atomic_calc_changes(struct drm_crtc_state *crtc_state,
+int intel_plane_atomic_calc_changes(const struct intel_crtc_state *old_crtc_state,
+				    struct drm_crtc_state *crtc_state,
+				    const struct intel_plane_state *old_plane_state,
 				    struct drm_plane_state *plane_state);
 
 void assert_pch_transcoder_disabled(struct drm_i915_private *dev_priv,
@@ -1978,7 +1988,9 @@ 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);
 extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
-int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
+int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_state,
+					struct intel_crtc_state *crtc_state,
+					const struct intel_plane_state *old_plane_state,
 					struct intel_plane_state *intel_state);
 
 /* intel_color.c */