[PATCH 08/11] drm/crtc: attempt to set tiled modes from userspace

[Dave Airlie <airlied@gmail.com>]

From: Dave Airlie <airlied@redhat.com>

So when userspace asks us to set a mode on a tiled crtc,
split it up and find the actual modes and attempt to set them.

Also disable crtcs when no longer in tiled group.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/drm_crtc.c            | 51 ++++++++++++++++++++++++++++++++---
 drivers/gpu/drm/drm_dp_mst_topology.c |  6 +++++
 include/drm/drm_crtc.h                |  8 ++++++
 3 files changed, 61 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 99fa259..628f3af 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -764,6 +764,9 @@ int drm_crtc_init_with_planes(struct drm_device *dev, struct drm_crtc *crtc,
 	crtc->funcs = funcs;
 	crtc->invert_dimensions = false;
 
+	INIT_LIST_HEAD(&crtc->tile_crtc_list);
+	crtc->tile_master = NULL;
+
 	drm_modeset_lock_all(dev);
 	drm_modeset_lock_init(&crtc->mutex);
 	/* dropped by _unlock_all(): */
@@ -2520,7 +2523,7 @@ static int drm_mode_setcrtc_tiled(struct drm_mode_set *orig_set)
 	list_for_each_entry(crtc2, &dev->mode_config.crtc_list, head) {
 		if (crtc2 == orig_set->crtc)
 			continue;
-		if (crtc2->enabled)
+		if (crtc2->enabled && !crtc2->tile_master)
 			continue;
 		pick_crtc = crtc2;
 		break;
@@ -2583,14 +2586,26 @@ static int drm_mode_setcrtc_tiled(struct drm_mode_set *orig_set)
 	set[1].x = orig_set->x + ((pick_conn[1]->tile_h_loc == 1) ? pick_conn[0]->tile_h_size + 1 : 0);
 	set[1].y = orig_set->y + ((pick_conn[1]->tile_v_loc == 1) ? pick_conn[0]->tile_v_size + 1 : 0);
 
+	if (set[1].crtc->tile_master) {
+		list_del(&set[1].crtc->tile);
+		set[1].crtc->tile_master = NULL;
+	}
+	list_add_tail(&set[1].crtc->tile, &set[0].crtc->tile_crtc_list);
+	set[1].crtc->tile_master = set[0].crtc;
 	/* find a mode to use on each head */
 	set[0].mode = pick_modes[0];
 	set[1].mode = pick_modes[1];
 
 	ret = drm_mode_set_config_internal(&set[0]);
 
-	ret = drm_mode_set_config_internal(&set[1]);
+	if (!ret) {
+		ret = drm_mode_set_config_internal(&set[1]);
+	}
 
+	if (ret) {
+		set[1].crtc->tile_master = NULL;
+		list_del(&set[1].crtc->tile);
+	}
 	return ret;
 }
 /**
@@ -2637,6 +2652,15 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 	}
 	DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
 
+	if (crtc->tile_master) {
+		if (crtc_req->mode_valid)
+			ret = -EBUSY;
+		else
+			ret = 0;
+		DRM_DEBUG_KMS("[CRTC:%d] refused due to tile %d\n", crtc->base.id, ret);
+		goto out;
+	}
+
 	if (crtc_req->mode_valid) {
 		/* If we have a mode we need a framebuffer. */
 		/* If we pass -1, set the mode with the currently bound fb */
@@ -2748,9 +2772,25 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 
 	if (num_tiles > 1) {
 		ret = drm_mode_setcrtc_tiled(&set);
-	} else
-		ret = drm_mode_set_config_internal(&set);
+	} else {
+		if (!list_empty(&crtc->tile_crtc_list)) {
+			struct drm_crtc *tile_crtc, *t;
+
+			list_for_each_entry_safe(tile_crtc, t, &crtc->tile_crtc_list, tile) {
+				struct drm_mode_set set2;
+
+				tile_crtc->tile_master = NULL;
+				list_del(&tile_crtc->tile);
 
+				DRM_DEBUG_KMS("disabling crtc %p due to no longer needing tiling %p\n", tile_crtc, tile_crtc->primary);
+				memset(&set2, 0, sizeof(struct drm_mode_set));
+				set2.crtc = tile_crtc;
+				set2.fb = NULL;
+				ret = drm_mode_set_config_internal(&set2);
+			}
+		}
+		ret = drm_mode_set_config_internal(&set);
+	}
 out:
 	if (fb)
 		drm_framebuffer_unreference(fb);
@@ -4226,6 +4266,9 @@ static int drm_mode_connector_set_obj_prop(struct drm_mode_object *obj,
 	int ret = -EINVAL;
 	struct drm_connector *connector = obj_to_connector(obj);
 
+	if (connector->has_tile && connector->tile_is_single_monitor &&
+	    (connector->tile_h_loc || connector->tile_v_loc))
+		return 0;
 	/* Do DPMS ourselves */
 	if (property == connector->dev->mode_config.dpms_property) {
 		if (connector->funcs->dpms)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index 08b7140..ca5eee6 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2190,6 +2190,12 @@ enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector
 		if (port->port_num >= 8 && !port->cached_edid) {
 			port->cached_edid = drm_get_edid(connector, &port->aux.ddc);
 		}
+
+		if (connector->has_tile && connector->tile_group_id == 0)
+			connector->tile_group_id = port->parent->conn_base_id;
+		if (connector->has_tile && (connector->tile_h_loc || connector->tile_v_loc))
+			status = connector_status_disconnected;
+
 		break;
 	case DP_PEER_DEVICE_DP_LEGACY_CONV:
 		if (port->ldps)
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 67c06bd..6041acd 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -375,6 +375,14 @@ struct drm_crtc {
 	void *helper_private;
 
 	struct drm_object_properties properties;
+
+	/* crtcs this one is using for tiling */
+	struct list_head tile_crtc_list;
+
+	/* tile list entry */
+	struct list_head tile;
+
+	struct drm_crtc *tile_master;
 };
 
 
-- 
1.9.3