drm/vmwgfx: Support older hardware.

V2: Fix a couple of typos.

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 0c9c0811f42d..bdd87dc9e7b1 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -318,6 +318,15 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
                 goto out_err3;
         }
 
+        /* Need mmio memory to check for fifo pitchlock cap. */
+        if (!(dev_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY) &&
+            !(dev_priv->capabilities & SVGA_CAP_PITCHLOCK) &&
+            !vmw_fifo_have_pitchlock(dev_priv)) {
+                ret = -ENOSYS;
+                DRM_ERROR("Hardware has no pitchlock\n");
+                goto out_err4;
+        }
+
         dev_priv->tdev = ttm_object_device_init
             (dev_priv->mem_global_ref.object, 12);