drm/nouveau/gr/gf100-: insert some WFIs during gr init

Inserted wait-for-gr-idle in the places it seems that RM does it, seems
to prevent some random mmio timeouts on Quadro GV100.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.c

@@ -1385,6 +1385,8 @@ gf100_grctx_generate_main(struct gf100_gr *gr, struct gf100_grctx *info)
 		gf100_gr_mmio(gr, gr->fuc_sw_ctx);
 	}
 
+	gf100_gr_wait_idle(gr);
+
 	idle_timeout = nvkm_mask(device, 0x404154, 0xffffffff, 0x00000000);
 
 	grctx->pagepool(info);
@@ -1396,6 +1398,8 @@ gf100_grctx_generate_main(struct gf100_gr *gr, struct gf100_grctx *info)
 
 	gf100_grctx_generate_floorsweep(gr);
 
+	gf100_gr_wait_idle(gr);
+
 	if (grctx->r400088) grctx->r400088(gr, false);
 	if (gr->fuc_bundle)
 		gf100_gr_icmd(gr, gr->fuc_bundle);

drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c

@@ -2123,6 +2123,8 @@ gf100_gr_init(struct gf100_gr *gr)
 	else
 		gf100_gr_mmio(gr, gr->func->mmio);
 
+	gf100_gr_wait_idle(gr);
+
 	if (gr->func->init_r405a14)
 		gr->func->init_r405a14(gr);