3 files changed, 31 insertions, 0 deletions
diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 6f16cbac..83c75108 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -84,6 +84,7 @@ search_snoop_cache(struct kgem *kgem, unsigned int num_pages, unsigned flags);
 #define DBG_NO_HANDLE_LUT 0
 #define DBG_NO_WT 0
 #define DBG_NO_WC_MMAP 0
+#define DBG_NO_SCANOUT_Y 0
 #define DBG_DUMP 0
 #define DBG_NO_MALLOC_CACHE 0
 
@@ -1231,6 +1232,30 @@ static bool test_has_create2(struct kgem *kgem)
 #endif
 }
 
+static bool test_can_scanout_y(struct kgem *kgem)
+{
+	struct drm_mode_fb_cmd arg;
+	bool ret = false;
+
+	if (DBG_NO_SCANOUT_Y)
+		return false;
+
+	VG_CLEAR(arg);
+	arg.width = 32;
+	arg.height = 32;
+	arg.pitch = 4*32;
+	arg.bpp = 32;
+	arg.depth = 24;
+	arg.handle = gem_create(kgem->fd, 1);
+
+	if (gem_set_tiling(kgem->fd, arg.handle, I915_TILING_Y, arg.pitch))
+		ret = do_ioctl(kgem->fd, DRM_IOCTL_MODE_ADDFB, &arg) == 0;
+	do_ioctl(kgem->fd, DRM_IOCTL_MODE_RMFB, &arg.fb_id);
+	gem_close(kgem->fd, arg.handle);
+
+	return ret;
+}
+
 static bool test_has_secure_batches(struct kgem *kgem)
 {
 	if (DBG_NO_SECURE_BATCHES)
@@ -1604,6 +1629,10 @@ void kgem_init(struct kgem *kgem, int fd, struct pci_device *dev, unsigned gen)
 	DBG(("%s: can render to Y-tiled surfaces? %d\n", __FUNCTION__,
 	     kgem->can_render_y));
 
+	kgem->can_scanout_y = test_can_scanout_y(kgem);
+	DBG(("%s: can render to Y-tiled surfaces? %d\n", __FUNCTION__,
+	     kgem->can_scanout_y));
+
 	kgem->has_secure_batches = test_has_secure_batches(kgem);
 	DBG(("%s: can use privileged batchbuffers? %d\n", __FUNCTION__,
 	     kgem->has_secure_batches));
diff --git a/src/sna/kgem.h b/src/sna/kgem.h
index f98d3b6d..51072e29 100644
--- a/src/sna/kgem.h
+++ b/src/sna/kgem.h
@@ -190,6 +190,7 @@ struct kgem {
 
 	uint32_t can_blt_cpu :1;
 	uint32_t can_render_y :1;
+	uint32_t can_scanout_y :1;
 
 	uint16_t fence_max;
 	uint16_t half_cpu_cache_pages;
diff --git a/src/sna/sna_present.c b/src/sna/sna_present.c
index 836c89d7..d6638db3 100644
--- a/src/sna/sna_present.c
+++ b/src/sna/sna_present.c
@@ -583,6 +583,7 @@ get_flip_bo(PixmapPtr pixmap)
 	}
 
 	if (priv->gpu_bo->tiling == I915_TILING_Y &&
+	    !sna->kgem.can_scanout_y &&
 	    !sna_pixmap_change_tiling(pixmap, I915_TILING_X)) {
 		DBG(("%s: invalid Y-tiling, cannot convert\n", __FUNCTION__));
 		return NULL;