From 9ed9c14eb5479498e3e3a77c1d740c96a6027e8d Mon Sep 17 00:00:00 2001
From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Wed, 19 Oct 2016 14:56:06 +0200
Subject: [PATCH] kmssink: if the plane can not scale, retry without scaling
 and remember

Retry the drmModeSetPlane call without scaling if the first try fails,
and remember not to scale anymore.

https://bugzilla.gnome.org/show_bug.cgi?id=781188
---
 sys/kms/gstkmssink.c | 12 ++++++++++--
 sys/kms/gstkmssink.h |  1 +
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/sys/kms/gstkmssink.c b/sys/kms/gstkmssink.c
index 8a9ff365d9..3c5571e80b 100644
--- a/sys/kms/gstkmssink.c
+++ b/sys/kms/gstkmssink.c
@@ -517,6 +517,8 @@ gst_kms_sink_start (GstBaseSink * bsink)
   if (!get_drm_caps (self))
     goto bail;
 
+  self->can_scale = TRUE;
+
   res = drmModeGetResources (self->fd);
   if (!res)
     goto resources_failed;
@@ -1261,7 +1263,8 @@ gst_kms_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
   dst.w = self->hdisplay;
   dst.h = self->vdisplay;
 
-  gst_video_sink_center_rect (src, dst, &result, TRUE);
+retry_set_plane:
+  gst_video_sink_center_rect (src, dst, &result, self->can_scale);
 
   if (crop) {
     src.w = crop->width;
@@ -1279,8 +1282,13 @@ gst_kms_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
       result.x, result.y, result.w, result.h,
       /* source/cropping coordinates are given in Q16 */
       src.x << 16, src.y << 16, src.w << 16, src.h << 16);
-  if (ret)
+  if (ret) {
+    if (self->can_scale) {
+      self->can_scale = FALSE;
+      goto retry_set_plane;
+    }
     goto set_plane_failed;
+  }
 
 sync_frame:
   /* Wait for the previous frame to complete redraw */
diff --git a/sys/kms/gstkmssink.h b/sys/kms/gstkmssink.h
index 19e695d4dd..214f3ad806 100644
--- a/sys/kms/gstkmssink.h
+++ b/sys/kms/gstkmssink.h
@@ -61,6 +61,7 @@ struct _GstKMSSink {
   /* capabilities */
   gboolean has_prime_import;
   gboolean has_async_page_flip;
+  gboolean can_scale;
 
   gboolean modesetting_enabled;