From: Alex Deucher <alexander.deucher@amd.com>
Date: Wed, 2 Jan 2013 23:30:21 +0000 (-0500)
Subject: drm/radeon/r6xx: fix DMA engine for ttm bo transfers
X-Git-Tag: v3.8-rc3~23^2~2^2~11
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=909d9eb67f1e4e39f2ea88e96bde03d560cde3eb;p=~emulex%2Finfiniband.git

drm/radeon/r6xx: fix DMA engine for ttm bo transfers

count must be a multiple of 2. Fixes crashes on
R6xx chips reported by a number of people.

Cc: Borislav Petkov <bp@alien8.de>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Tested-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 2aaf147969b..9f4ce5eb9e9 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2636,8 +2636,8 @@ int r600_copy_dma(struct radeon_device *rdev,
 
 	for (i = 0; i < num_loops; i++) {
 		cur_size_in_dw = size_in_dw;
-		if (cur_size_in_dw > 0xFFFF)
-			cur_size_in_dw = 0xFFFF;
+		if (cur_size_in_dw > 0xFFFE)
+			cur_size_in_dw = 0xFFFE;
 		size_in_dw -= cur_size_in_dw;
 		radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
 		radeon_ring_write(ring, dst_offset & 0xfffffffc);