drm/radeon/kms: fix r6xx/7xx 1D tiling CS checker v2

broken by:
drm/radeon/r600: fix tiling issues in CS checker.

v2: only apply it to 1D tiling case.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/r600_cs.c

diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index 4180291..7b294c1 100644
--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -215,6 +215,9 @@
 				 __func__, __LINE__, pitch);
 			return -EINVAL;
 		}
+		/* avoid breaking userspace */
+		if (height > 7)
+			height &= ~0x7;
 		if (!IS_ALIGNED(height, 8)) {
 			dev_warn(p->dev, "%s:%d cb height (%d) invalid\n",
 				 __func__, __LINE__, height);