drm/nvc0/fifo: kick channels off during suspend

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvc0_fifo.c

@@ -240,6 +240,22 @@ nvc0_fifo_load_context(struct nouveau_channel *chan)
 int
 nvc0_fifo_unload_context(struct drm_device *dev)
 {
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	int i;
+
+	for (i = 0; i < 128; i++) {
+		if (!(nv_rd32(dev, 0x003004 + (i * 4)) & 1))
+			continue;
+
+		nv_mask(dev, 0x003004 + (i * 4), 0x00000001, 0x00000000);
+		nv_wr32(dev, 0x002634, i);
+		if (!nv_wait(dev, 0x002634, 0xffffffff, i)) {
+			NV_INFO(dev, "PFIFO: kick ch %d failed: 0x%08x\n",
+				i, nv_rd32(dev, 0x002634));
+			return -EBUSY;
+		}
+	}
+
 	return 0;
 }