[Intel-gfx] [PATCH 1/3] drm/i915/dp: Make sure all tiled connectors get added to the state with full modeset

[Manasi Navare]

In case of tiled displays, all the tiles are linke dto each other
for transcoder port sync. So in intel_atomic_check() we need to make
sure that we add all the tiles to the modeset and if one of the
tiles needs a full modeset then mark all other tiles for a full modeset.

Suggested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 78 ++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 803993a01ca7..7263eaa66cda 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -14066,6 +14066,80 @@ static int intel_atomic_check_crtcs(struct intel_atomic_state *state)
 	return 0;
 }
 
+static int
+intel_dp_modeset_all_tiles(struct drm_i915_private *dev_priv,
+			   struct intel_atomic_state *state, int tile_grp_id)
+{
+	struct drm_connector *conn_iter;
+	struct drm_connector_list_iter conn_list_iter;
+	struct drm_crtc_state *crtc_state;
+
+	drm_connector_list_iter_begin(&dev_priv->drm, &conn_list_iter);
+	drm_for_each_connector_iter(conn_iter, &conn_list_iter) {
+		struct drm_connector_state *conn_iter_state;
+
+		if (!conn_iter->has_tile)
+			continue;
+		conn_iter_state = drm_atomic_get_connector_state(&state->base,
+								 conn_iter);
+		if (IS_ERR(conn_iter_state)) {
+			drm_connector_list_iter_end(&conn_list_iter);
+			return PTR_ERR(conn_iter_state);
+		}
+
+		if (!conn_iter_state->crtc)
+			continue;
+
+		if (conn_iter->tile_group->id != tile_grp_id)
+			continue;
+
+		crtc_state = drm_atomic_get_crtc_state(&state->base, conn_iter_state->crtc);
+		if (IS_ERR(crtc_state)) {
+			drm_connector_list_iter_end(&conn_list_iter);
+			return PTR_ERR(conn_iter_state);
+		}
+		crtc_state->mode_changed = true;
+	}
+	drm_connector_list_iter_end(&conn_list_iter);
+
+	return 0;
+}
+
+static int
+intel_dp_atomic_trans_port_sync_check(struct drm_i915_private *dev_priv,
+				      struct intel_atomic_state *state)
+{
+	struct drm_connector *connector;
+	struct drm_crtc_state *crtc_state;
+	struct drm_connector_state *connector_state;
+	int i, ret, tile_grp_id = 0;
+
+	if (INTEL_GEN(dev_priv) < 11)
+		return 0;
+
+	/* Is tiled, mark all other tiled CRTCs as needing a modeset */
+	for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
+		if (!connector->has_tile)
+			continue;
+		if (connector_state->crtc &&
+		    tile_grp_id != connector->tile_group->id) {
+			crtc_state = drm_atomic_get_new_crtc_state(&state->base,
+								   connector_state->crtc);
+			if (!drm_atomic_crtc_needs_modeset(crtc_state))
+				continue;
+
+			tile_grp_id = connector->tile_group->id;
+		} else
+			continue;
+
+		ret = intel_dp_modeset_all_tiles(dev_priv, state, tile_grp_id);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 /**
  * intel_atomic_check - validate state object
  * @dev: drm device
@@ -14093,6 +14167,10 @@ static int intel_atomic_check(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
+	ret = intel_dp_atomic_trans_port_sync_check(dev_priv, state);
+	if (ret)
+		goto fail;
+
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
 		if (!needs_modeset(new_crtc_state)) {
-- 
2.19.1