drm/nv40: Ignore sync-to-vblank active when waiting for idle.

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

drivers/gpu/drm/nouveau/nouveau_reg.h

@@ -332,6 +332,7 @@
 #define NV04_PGRAPH_BSWIZZLE5                              0x004006A0
 #define NV03_PGRAPH_STATUS                                 0x004006B0
 #define NV04_PGRAPH_STATUS                                 0x00400700
+#    define NV40_PGRAPH_STATUS_SYNC_STALL                  0x00004000
 #define NV04_PGRAPH_TRAPPED_ADDR                           0x00400704
 #define NV04_PGRAPH_TRAPPED_DATA                           0x00400708
 #define NV04_PGRAPH_SURFACE                                0x0040070C

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -1105,7 +1105,13 @@ bool nouveau_wait_until(struct drm_device *dev, uint64_t timeout,
 /* Waits for PGRAPH to go completely idle */
 bool nouveau_wait_for_idle(struct drm_device *dev)
 {
-	if (!nv_wait(dev, NV04_PGRAPH_STATUS, 0xffffffff, 0x00000000)) {
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	uint32_t mask = ~0;
+
+	if (dev_priv->card_type == NV_40)
+		mask &= ~NV40_PGRAPH_STATUS_SYNC_STALL;
+
+	if (!nv_wait(dev, NV04_PGRAPH_STATUS, mask, 0)) {
 		NV_ERROR(dev, "PGRAPH idle timed out with status 0x%08x\n",
 			 nv_rd32(dev, NV04_PGRAPH_STATUS));
 		return false;