drm/nvc0/fb: detect presense of second rank

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

diff --git a/drivers/gpu/drm/nouveau/nvc0_vram.c b/drivers/gpu/drm/nouveau/nvc0_vram.c
index fd687ee..82b51b2 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvc0_vram.c
+++ b/drivers/gpu/drm/nouveau/nvc0_vram.c
@@ -116,6 +116,7 @@ nvc0_vram_init(struct drm_device *dev)
        NV_DEBUG(dev, "parts 0x%08x bcast_mem_amount 0x%08x\n", parts, bsize);
 
        dev_priv->vram_type = nouveau_mem_vbios_type(dev);
+       dev_priv->vram_rank_B = !!(nv_rd32(dev, 0x10f200) & 0x00000004);
 
        /* read amount of vram attached to each memory controller */
        part = 0;