drm/nv50: use correct PRAMIN flush register on original nv50

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

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -1028,6 +1028,7 @@ extern void nv50_instmem_clear(struct drm_device *, struct nouveau_gpuobj *);
 extern int  nv50_instmem_bind(struct drm_device *, struct nouveau_gpuobj *);
 extern int  nv50_instmem_unbind(struct drm_device *, struct nouveau_gpuobj *);
 extern void nv50_instmem_flush(struct drm_device *);
+extern void nv84_instmem_flush(struct drm_device *);
 extern void nv50_vm_flush(struct drm_device *, int engine);
 
 /* nv04_mc.c */

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -266,7 +266,10 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->instmem.clear		= nv50_instmem_clear;
 		engine->instmem.bind		= nv50_instmem_bind;
 		engine->instmem.unbind		= nv50_instmem_unbind;
-		engine->instmem.flush		= nv50_instmem_flush;
+		if (dev_priv->chipset == 0x50)
+			engine->instmem.flush	= nv50_instmem_flush;
+		else
+			engine->instmem.flush	= nv84_instmem_flush;
 		engine->mc.init			= nv50_mc_init;
 		engine->mc.takedown		= nv50_mc_takedown;
 		engine->timer.init		= nv04_timer_init;

drivers/gpu/drm/nouveau/nv50_instmem.c

@@ -485,6 +485,14 @@ nv50_instmem_unbind(struct drm_device *dev, struct nouveau_gpuobj *gpuobj)
 
 void
 nv50_instmem_flush(struct drm_device *dev)
+{
+	nv_wr32(dev, 0x00330c, 0x00000001);
+	if (!nv_wait(0x00330c, 0x00000001, 0x00000000))
+		NV_ERROR(dev, "PRAMIN flush timeout\n");
+}
+
+void
+nv84_instmem_flush(struct drm_device *dev)
 {
 	nv_wr32(dev, 0x070000, 0x00000001);
 	if (!nv_wait(0x070000, 0x00000001, 0x00000000))