drm/nouveau/ltcg: fix ltcg memory initialization after suspend

Some registers were not initialized in init, this causes them to be
uninitialized after suspend.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 23 insertions, 9 deletions

diff --git a/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
index bcca883018f4..ee2a0beef5e6 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
@@ -30,8 +30,9 @@ struct nvc0_ltcg_priv {
         struct nouveau_ltcg base;
         u32 part_nr;
         u32 subp_nr;
-        struct nouveau_mm tags;
         u32 num_tags;
+        u32 tag_base;
+        struct nouveau_mm tags;
         struct nouveau_mm_node *tag_ram;
 };
 
@@ -117,10 +118,6 @@ nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
         u32 tag_size, tag_margin, tag_align;
         int ret;
 
-        nv_wr32(priv, 0x17e8d8, priv->part_nr);
-        if (nv_device(pfb)->card_type >= NV_E0)
-                nv_wr32(priv, 0x17e000, priv->part_nr);
-
         /* tags for 1/4 of VRAM should be enough (8192/4 per GiB of VRAM) */
         priv->num_tags = (pfb->ram->size >> 17) / 4;
         if (priv->num_tags > (1 << 17))
@@ -152,7 +149,7 @@ nvc0_ltcg_init_tag_ram(struct nouveau_fb *pfb, struct nvc0_ltcg_priv *priv)
                 tag_base += tag_align - 1;
                 ret = do_div(tag_base, tag_align);
 
-                nv_wr32(priv, 0x17e8d4, tag_base);
+                priv->tag_base = tag_base;
         }
         ret = nouveau_mm_init(&priv->tags, 0, priv->num_tags, 1);
 
@@ -182,8 +179,6 @@ nvc0_ltcg_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
         }
         priv->subp_nr = nv_rd32(priv, 0x17e8dc) >> 28;
 
-        nv_mask(priv, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */
-
         ret = nvc0_ltcg_init_tag_ram(pfb, priv);
         if (ret)
                 return ret;
@@ -209,13 +204,32 @@ nvc0_ltcg_dtor(struct nouveau_object *object)
         nouveau_ltcg_destroy(ltcg);
 }
 
+static int
+nvc0_ltcg_init(struct nouveau_object *object)
+{
+        struct nouveau_ltcg *ltcg = (struct nouveau_ltcg *)object;
+        struct nvc0_ltcg_priv *priv = (struct nvc0_ltcg_priv *)ltcg;
+        int ret;
+
+        ret = nouveau_ltcg_init(ltcg);
+        if (ret)
+                return ret;
+
+        nv_mask(priv, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */
+        nv_wr32(priv, 0x17e8d8, priv->part_nr);
+        if (nv_device(ltcg)->card_type >= NV_E0)
+                nv_wr32(priv, 0x17e000, priv->part_nr);
+        nv_wr32(priv, 0x17e8d4, priv->tag_base);
+        return 0;
+}
+
 struct nouveau_oclass
 nvc0_ltcg_oclass = {
         .handle = NV_SUBDEV(LTCG, 0xc0),
         .ofuncs = &(struct nouveau_ofuncs) {
                 .ctor = nvc0_ltcg_ctor,
                 .dtor = nvc0_ltcg_dtor,
-                .init = _nouveau_ltcg_init,
+                .init = nvc0_ltcg_init,
                 .fini = _nouveau_ltcg_fini,
         },
 };