drm/nvc0/copy: check PUNITS to determine which copy engines are disabled

On some Fermi chipsets (NVCE particularly) PCOPY1 doesn't exist.  And if
what I've seen on Kepler is true of Fermi too, chipsets of the same type
can have different PCOPY units available.

This should fix a v3.5 regression reported by a number of people effecting
suspend/resume on NVC8/NVCE chipsets.

Cc: stable@vger.kernel.org [3.5]
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index 1866dbb499792e4e4758938c50802d11beb29bb7..c61014442aa931cfe5822069c7ecf6c0d565f4dc 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -736,9 +736,11 @@ nouveau_card_init(struct drm_device *dev)
                        }
                        break;
                case NV_C0:
-                       nvc0_copy_create(dev, 1);
+                       if (!(nv_rd32(dev, 0x022500) & 0x00000200))
+                               nvc0_copy_create(dev, 1);
                case NV_D0:
-                       nvc0_copy_create(dev, 0);
+                       if (!(nv_rd32(dev, 0x022500) & 0x00000100))
+                               nvc0_copy_create(dev, 0);
                        break;
                default:
                        break;