drm/nv04-nv40: Give "gpuobj->cinst" the same meaning as on nv50.

No functional changes, just simplify some code paths a bit.
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_object.c

@@ -202,11 +202,7 @@ nouveau_gpuobj_new(struct drm_device *dev, struct nouveau_channel *chan,
 		if (gpuobj->pinst != ~0)
 			gpuobj->pinst += ramin->start;
 
-		if (dev_priv->card_type < NV_50)
-			gpuobj->cinst = gpuobj->pinst;
-		else
-			gpuobj->cinst = ramin->start;
-
+		gpuobj->cinst = ramin->start;
 		gpuobj->vinst = ramin->start + chan->ramin->vinst;
 		gpuobj->node  = ramin;
 	} else {

drivers/gpu/drm/nouveau/nouveau_ramht.c

@@ -104,12 +104,12 @@ nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
 	nouveau_gpuobj_ref(gpuobj, &entry->gpuobj);
 
 	if (dev_priv->card_type < NV_40) {
-		ctx = NV_RAMHT_CONTEXT_VALID | (gpuobj->cinst >> 4) |
+		ctx = NV_RAMHT_CONTEXT_VALID | (gpuobj->pinst >> 4) |
 		      (chan->id << NV_RAMHT_CONTEXT_CHANNEL_SHIFT) |
 		      (gpuobj->engine << NV_RAMHT_CONTEXT_ENGINE_SHIFT);
 	} else
 	if (dev_priv->card_type < NV_50) {
-		ctx = (gpuobj->cinst >> 4) |
+		ctx = (gpuobj->pinst >> 4) |
 		      (chan->id << NV40_RAMHT_CONTEXT_CHANNEL_SHIFT) |
 		      (gpuobj->engine << NV40_RAMHT_CONTEXT_ENGINE_SHIFT);
 	} else {

drivers/gpu/drm/nouveau/nouveau_sgdma.c

@@ -241,12 +241,6 @@ nouveau_sgdma_init(struct drm_device *dev)
 	}
 
 	if (dev_priv->card_type < NV_50) {
-		/* special case, allocated from global instmem heap so
-		 * cinst is invalid, we use it on all channels though so
-		 * cinst needs to be valid, set it the same as pinst
-		 */
-		gpuobj->cinst = gpuobj->pinst;
-
 		nv_wo32(gpuobj, 0, NV_CLASS_DMA_IN_MEMORY |
 				   (1 << 12) /* PT present */ |
 				   (0 << 13) /* PT *not* linear */ |