drm/nouveau: Don't enable AGP FW on nv18.

FW seems to be broken on nv18, it causes random lockups and breaks
suspend/resume even with the blob.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 19 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_mem.c b/drivers/gpu/drm/nouveau/nouveau_mem.c
index fb15a1b0dda9..a885cd0b27e8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_mem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_mem.c
@@ -417,6 +417,23 @@ nouveau_mem_detect(struct drm_device *dev)
         return -ENOMEM;
 }
 
+#if __OS_HAS_AGP
+static unsigned long
+get_agp_mode(struct drm_device *dev, unsigned long mode)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        /*
+         * FW seems to be broken on nv18, it makes the card lock up
+         * randomly.
+         */
+        if (dev_priv->chipset == 0x18)
+                mode &= ~PCI_AGP_COMMAND_FW;
+
+        return mode;
+}
+#endif
+
 int
 nouveau_mem_reset_agp(struct drm_device *dev)
 {
@@ -436,7 +453,7 @@ nouveau_mem_reset_agp(struct drm_device *dev)
                 if (ret)
                         return ret;
 
-                mode.mode = info.mode & ~PCI_AGP_COMMAND_FW;
+                mode.mode = get_agp_mode(dev, info.mode) & ~PCI_AGP_COMMAND_FW;
                 ret = drm_agp_enable(dev, mode);
                 if (ret)
                         return ret;
@@ -491,7 +508,7 @@ nouveau_mem_init_agp(struct drm_device *dev)
         }
 
         /* see agp.h for the AGPSTAT_* modes available */
-        mode.mode = info.mode;
+        mode.mode = get_agp_mode(dev, info.mode);
         ret = drm_agp_enable(dev, mode);
         if (ret) {
                 NV_ERROR(dev, "Unable to enable AGP: %d\n", ret);