[PATCH 4/5] drm/i915/dp: Make port sync mode assignments only if all tiles present

[Manasi Navare]

Add an extra check before making master slave assignments for tiled
displays to make sure we make these assignments only if all tiled
connectors are present. If not then initialize the state to defaults
so it does a normal non tiled modeset without transcoder port sync.

Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/5
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 28 ++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 7263eaa66cda..c0a2dab3fe67 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -12048,6 +12048,12 @@ static bool c8_planes_changed(const struct intel_crtc_state *new_crtc_state)
 	return !old_crtc_state->c8_planes != !new_crtc_state->c8_planes;
 }
 
+static void initialize_trans_port_sync_mode_state(struct intel_crtc_state *crtc_state)
+{
+	crtc_state->master_transcoder = INVALID_TRANSCODER;
+	crtc_state->sync_mode_slaves_mask = 0;
+}
+
 static int icl_add_sync_mode_crtcs(struct intel_crtc_state *crtc_state)
 {
 	struct drm_crtc *crtc = crtc_state->uapi.crtc;
@@ -12059,11 +12065,22 @@ static int icl_add_sync_mode_crtcs(struct intel_crtc_state *crtc_state)
 	struct drm_crtc *master_crtc = NULL;
 	struct drm_crtc_state *master_crtc_state;
 	struct intel_crtc_state *master_pipe_config;
-	int i, tile_group_id;
+	int i, tile_group_id = 0, num_tiled_conns = 0;
 
 	if (INTEL_GEN(dev_priv) < 11)
 		return 0;
 
+	/* If all tiles not present do not make master slave assignments
+	 * Here we assume all tiles belong to the same tile group for now.
+	 */
+	for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
+		if (connector->has_tile) {
+			if (!tile_group_id)
+				tile_group_id = connector->tile_group->id;
+			num_tiled_conns++;
+		}
+	}
+
 	/*
 	 * In case of tiled displays there could be one or more slaves but there is
 	 * only one master. Lets make the CRTC used by the connector corresponding
@@ -12077,8 +12094,15 @@ static int icl_add_sync_mode_crtcs(struct intel_crtc_state *crtc_state)
 		if (!connector->has_tile)
 			continue;
 		if (crtc_state->hw.mode.hdisplay != connector->tile_h_size ||
-		    crtc_state->hw.mode.vdisplay != connector->tile_v_size)
+		    crtc_state->hw.mode.vdisplay != connector->tile_v_size) {
+			initialize_trans_port_sync_mode_state(crtc_state);
 			return 0;
+		}
+		if (connector->tile_group->id == tile_group_id &&
+		    num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
+			initialize_trans_port_sync_mode_state(crtc_state);
+			return 0;
+		}
 		if (connector->tile_h_loc == connector->num_h_tile - 1 &&
 		    connector->tile_v_loc == connector->num_v_tile - 1)
 			continue;
-- 
2.19.1