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authorFrancisco Jerez <currojerez@riseup.net>2013-02-26 02:33:11 +0100
committerBen Skeggs <bskeggs@redhat.com>2013-03-04 11:46:12 +1000
commit650e1203c11354ba84d69ba445abc0efcfe3890a (patch)
tree8890d9aaa5db76f53eba84746105242efb891415 /drivers/gpu
parent65b5f42e2a9eb9c8383fb67698bf8c27657f8c14 (diff)
drm/nouveau: Disable AGP on PowerPC again.
Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_agp.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_agp.c b/drivers/gpu/drm/nouveau/nouveau_agp.c
index d28430cd2ba6..6e7a55f93a85 100644
--- a/drivers/gpu/drm/nouveau/nouveau_agp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_agp.c
@@ -47,6 +47,18 @@ nouveau_agp_enabled(struct nouveau_drm *drm)
if (drm->agp.stat == UNKNOWN) {
if (!nouveau_agpmode)
return false;
+#ifdef __powerpc__
+ /* Disable AGP by default on all PowerPC machines for
+ * now -- At least some UniNorth-2 AGP bridges are
+ * known to be broken: DMA from the host to the card
+ * works just fine, but writeback from the card to the
+ * host goes straight to memory untranslated bypassing
+ * the GATT somehow, making them quite painful to deal
+ * with...
+ */
+ if (nouveau_agpmode == -1)
+ return false;
+#endif
return true;
}