From c2cd60db0feaebb827fe8eb3bbfc85040abf49da Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javier@osg.samsung.com>
Date: Tue, 28 Jun 2016 20:51:56 -0400
Subject: [PATCH] kmssink: add a plane-id property

Without setting the DRM_CLIENT_CAP_UNIVERSAL_PLANES capability bit, only
overlay planes are made available for compatibility with legacy clients.

But if a CRTC doesn't have an overlay plane associated, then kmssink is
not able to find a plane for the CRTC and the pipeline will fail, i.e:

ERROR                kmssink gstkmssink.c:482:gst_kms_sink_start:<kmssink0> Could not find a plane for crtc

This patch adds a plane-id property to the kmssink element so a specific
plane can be used in case that a CRTC has only a primary plane associated.

https://bugzilla.gnome.org/show_bug.cgi?id=768183
---
 docs/plugins/gst-plugins-bad-plugins.args | 10 ++++++++++
 sys/kms/gstkmssink.c                      | 24 +++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/docs/plugins/gst-plugins-bad-plugins.args b/docs/plugins/gst-plugins-bad-plugins.args
index 90ce2ab..2f8cc38 100644
--- a/docs/plugins/gst-plugins-bad-plugins.args
+++ b/docs/plugins/gst-plugins-bad-plugins.args
@@ -72071,6 +72071,16 @@ Gestures in the defined region of interest will emit messages.</BLURB>
 </ARG>
 
 <ARG>
+<NAME>GstKMSSink::plane-id</NAME>
+<TYPE>gint</TYPE>
+<RANGE>>= G_MAXULONG</RANGE>
+<FLAGS>rwx</FLAGS>
+<NICK>Plane ID</NICK>
+<BLURB>DRM plane id.</BLURB>
+<DEFAULT>-1</DEFAULT>
+</ARG>
+
+<ARG>
 <NAME>GstBs2b::fcut</NAME>
 <TYPE>gint</TYPE>
 <RANGE>[300,2000]</RANGE>
diff --git a/sys/kms/gstkmssink.c b/sys/kms/gstkmssink.c
index 90ce3ff..3c1c954 100644
--- a/sys/kms/gstkmssink.c
+++ b/sys/kms/gstkmssink.c
@@ -73,6 +73,7 @@ enum
 {
   PROP_DRIVER_NAME = 1,
   PROP_CONNECTOR_ID,
+  PROP_PLANE_ID,
   PROP_N
 };
 
@@ -391,7 +392,10 @@ gst_kms_sink_start (GstBaseSink * bsink)
   if (!pres)
     goto plane_resources_failed;
 
-  plane = find_plane_for_crtc (self->fd, res, pres, crtc->crtc_id);
+  if (self->plane_id == -1)
+    plane = find_plane_for_crtc (self->fd, res, pres, crtc->crtc_id);
+  else
+    plane = drmModeGetPlane (self->fd, self->plane_id);
   if (!plane)
     goto plane_failed;
 
@@ -1153,6 +1157,9 @@ gst_kms_sink_set_property (GObject * object, guint prop_id,
     case PROP_CONNECTOR_ID:
       sink->conn_id = g_value_get_int (value);
       break;
+    case PROP_PLANE_ID:
+      sink->plane_id = g_value_get_int (value);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -1174,6 +1181,9 @@ gst_kms_sink_get_property (GObject * object, guint prop_id,
     case PROP_CONNECTOR_ID:
       g_value_set_int (value, sink->conn_id);
       break;
+    case PROP_PLANE_ID:
+      g_value_set_int (value, sink->plane_id);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -1197,6 +1207,7 @@ gst_kms_sink_init (GstKMSSink * sink)
 {
   sink->fd = -1;
   sink->conn_id = -1;
+  sink->plane_id = -1;
   gst_poll_fd_init (&sink->pollfd);
   sink->poll = gst_poll_new (TRUE);
   gst_video_info_init (&sink->vinfo);
@@ -1259,6 +1270,17 @@ gst_kms_sink_class_init (GstKMSSinkClass * klass)
       "Connector ID", "DRM connector id", -1, G_MAXINT32, -1,
       G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT);
 
+   /**
+   * kmssink:plane-id:
+   *
+   * There could be several planes associated with a CRTC.
+   * By default the first plane that's possible to use with a given
+   * CRTC is tried.
+   */
+  g_properties[PROP_PLANE_ID] = g_param_spec_int ("plane-id",
+      "Plane ID", "DRM plane id", -1, G_MAXINT32, -1,
+      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT);
+
   g_object_class_install_properties (gobject_class, PROP_N, g_properties);
 }
 
-- 
2.7.4