drm/nvc0/ltcg: fix handling of disabled partitions

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

diff --git a/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c b/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
index e4940fb..7c6194f 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/ltcg/nvc0.c
@@ -29,7 +29,6 @@
 struct nvc0_ltcg_priv {
        struct nouveau_ltcg base;
        u32 part_nr;
-       u32 part_mask;
        u32 subp_nr;
        struct nouveau_mm tags;
        u32 num_tags;
@@ -105,8 +104,6 @@ nvc0_ltcg_tags_clear(struct nouveau_ltcg *ltcg, u32 first, u32 count)
 
        /* wait until it's finished with clearing */
        for (p = 0; p < priv->part_nr; ++p) {
-               if (!(priv->part_mask & (1 << p)))
-                       continue;
                for (i = 0; i < priv->subp_nr; ++i)
                        nv_wait(priv, 0x1410c8 + p * 0x2000 + i * 0x400, ~0, 0);
        }
@@ -167,16 +164,20 @@ nvc0_ltcg_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 {
        struct nvc0_ltcg_priv *priv;
        struct nouveau_fb *pfb = nouveau_fb(parent);
-       int ret;
+       u32 parts, mask;
+       int ret, i;
 
        ret = nouveau_ltcg_create(parent, engine, oclass, &priv);
        *pobject = nv_object(priv);
        if (ret)
                return ret;
 
-       priv->part_nr = nv_rd32(priv, 0x022438);
-       priv->part_mask = nv_rd32(priv, 0x022554);
-
+       parts = nv_rd32(priv, 0x022438);
+       mask = nv_rd32(priv, 0x022554);
+       for (i = 0; i < parts; i++) {
+               if (!(mask & (1 << i)))
+                       priv->part_nr++;
+       }
        priv->subp_nr = nv_rd32(priv, 0x17e8dc) >> 28;
 
        nv_mask(priv, 0x17e820, 0x00100000, 0x00000000); /* INTR_EN &= ~0x10 */