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yaml --- r: 200242 b: refs/heads/master c: 4eb3033 h: refs/heads/master v: v3
git-mirror · Jun 8, 2010 · e0708bb · e0708bb
1 parent 9db44e4
commit e0708bb
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Showing 2 changed files with 9 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 75047944480a33afad76a272b21116d032ba61fa
+refs/heads/master: 4eb3033c72099fab3536ed8ac54a5dc99f0832d7
diff --git a/trunk/drivers/gpu/drm/nouveau/nv50_fb.c b/trunk/drivers/gpu/drm/nouveau/nv50_fb.c
@@ -6,10 +6,16 @@
 int
 nv50_fb_init(struct drm_device *dev)
 {
-	/* This is needed to get meaningful information from 100c90
-	 * on traps. No idea what these values mean exactly. */
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 
+	/* Not a clue what this is exactly.  Without pointing it at a
+	 * scratch page, VRAM->GART blits with M2MF (as in DDX DFS)
+	 * cause IOMMU "read from address 0" errors (rh#561267)
+	 */
+	nv_wr32(dev, 0x100c08, dev_priv->gart_info.sg_dummy_bus >> 8);
+
+	/* This is needed to get meaningful information from 100c90
+	 * on traps. No idea what these values mean exactly. */
 	switch (dev_priv->chipset) {
 	case 0x50:
 		nv_wr32(dev, 0x100c90, 0x0707ff);