drm/i915/display: Check async flip state of every crtc and plane once

For every crtc in state, intel_atomic_check_async() was checking all
the crtc and plane states again.

v2: comparing pipe ids instead of crtc pointers when iterating over
planes

Cc: Karthik B S <karthik.b.s@intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211029202432.140745-1-jose.souza@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -7707,17 +7707,17 @@ static void kill_bigjoiner_slave(struct intel_atomic_state *state,
  * correspond to the last vblank and have no relation to the actual time when
  * the flip done event was sent.
  */
-static int intel_atomic_check_async(struct intel_atomic_state *state)
+static int intel_atomic_check_async(struct intel_atomic_state *state, struct intel_crtc *crtc)
 {
 	struct drm_i915_private *i915 = to_i915(state->base.dev);
 	const struct intel_crtc_state *old_crtc_state, *new_crtc_state;
 	const struct intel_plane_state *new_plane_state, *old_plane_state;
-	struct intel_crtc *crtc;
 	struct intel_plane *plane;
 	int i;
 
-	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
-					    new_crtc_state, i) {
+	old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc);
+	new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+
 	if (intel_crtc_needs_modeset(new_crtc_state)) {
 		drm_dbg_kms(&i915->drm, "Modeset Required. Async flip not supported\n");
 		return -EINVAL;
@@ -7732,10 +7732,12 @@ static int intel_atomic_check_async(struct intel_atomic_state *state)
 			    "Active planes cannot be changed during async flip\n");
 		return -EINVAL;
 	}
-	}
 
 	for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
 					     new_plane_state, i) {
+		if (plane->pipe != crtc->pipe)
+			continue;
+
 		/*
 		 * TODO: Async flip is only supported through the page flip IOCTL
 		 * as of now. So support currently added for primary plane only.
@@ -8054,7 +8056,7 @@ static int intel_atomic_check(struct drm_device *dev,
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
 		if (new_crtc_state->uapi.async_flip) {
-			ret = intel_atomic_check_async(state);
+			ret = intel_atomic_check_async(state, crtc);
 			if (ret)
 				goto fail;
 		}