From a2968896884545f5c8f3f16c398c1ee4534ad7a8 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexdeucher@gmail.com>
Date: Tue, 25 Aug 2009 11:39:56 -0400
Subject: RV740: disable small DFS transfers

Seems problematic on all rv740 chips, so until we
can find a solution, disable them.
---
 src/r600_exa.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/r600_exa.c b/src/r600_exa.c
index 77e94ea5..bee8f09c 100644
--- a/src/r600_exa.c
+++ b/src/r600_exa.c
@@ -1847,6 +1847,10 @@ R600DownloadFromScreen(PixmapPtr pSrc, int x, int y, int w, int h,
     int wpass = w * (bpp/8);
     drmBufPtr scratch;
 
+    /* RV740 seems to be particularly problematic with small xfers */
+    if ((info->ChipFamily == CHIP_FAMILY_RV740) && (w < 32 || h < 32))
+	return FALSE;
+
     if (src_pitch & 7)
 	return FALSE;
 
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