From b1886be721be792c98f17af31dd8c144754e05be Mon Sep 17 00:00:00 2001
From: Haihua Hu <jared.hu@nxp.com>
Date: Wed, 12 Jul 2017 10:17:18 +0800
Subject: [PATCH 3/3] [MMFMWK-7567] kmssink: check scaleable when set_caps

when video size is same as display resolution, show frame will not do
retry because the setplane will never fail. But the scale result is not
correct. We can do this check by set a fake plane.

Upstream-Status: Inappropriate [i.MX specific]

---
 sys/kms/gstkmssink.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/sys/kms/gstkmssink.c b/sys/kms/gstkmssink.c
index 6d9b765..65fdc4f 100644
--- a/sys/kms/gstkmssink.c
+++ b/sys/kms/gstkmssink.c
@@ -402,6 +402,42 @@ get_drm_caps (GstKMSSink * self)
   return TRUE;
 }
 
+static void
+check_scaleable (GstKMSSink * self)
+{
+  gint result;
+  guint32 fb_id;
+  guint32 width, height;
+  GstKMSMemory *kmsmem = NULL;
+
+  if (!self->can_scale)
+    return;
+
+  if (self->conn_id < 0)
+    return;
+
+  kmsmem = (GstKMSMemory *) gst_kms_allocator_bo_alloc (self->allocator, &self->vinfo);
+  if (!kmsmem)
+    return;
+
+  fb_id = kmsmem->fb_id;
+
+  GST_INFO_OBJECT (self, "checking scaleable");
+
+  width = GST_VIDEO_INFO_WIDTH (&self->vinfo);
+  height = GST_VIDEO_INFO_HEIGHT (&self->vinfo);
+
+  result = drmModeSetPlane (self->fd, self->plane_id, self->crtc_id, fb_id, 0,
+      0, 0, width/2, height/2,
+      0, 0, width << 16, height << 16);
+  if (result) {
+    self->can_scale = FALSE;
+    GST_INFO_OBJECT (self, "scale is not support");
+  }
+
+  g_clear_pointer (&kmsmem, gst_memory_unref);
+}
+
 static gboolean
 configure_mode_setting (GstKMSSink * self, GstVideoInfo * vinfo)
 {
@@ -977,6 +1013,8 @@ gst_kms_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
 
   self->vinfo = vinfo;
 
+  check_scaleable (self);
+
   GST_OBJECT_LOCK (self);
   if (self->reconfigure) {
     self->reconfigure = FALSE;
-- 
1.9.1