drm/vmwgfx: Save at least one screen layout

Save at least one screen layout during vga save to avoid odd things
happening during restore.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 5fb68f3981a2..87c6e6156d7d 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1025,6 +1025,9 @@ int vmw_kms_save_vga(struct vmw_private *vmw_priv)
         vmw_priv->num_displays = vmw_read(vmw_priv,
                                           SVGA_REG_NUM_GUEST_DISPLAYS);
 
+        if (vmw_priv->num_displays == 0)
+                vmw_priv->num_displays = 1;
+
         for (i = 0; i < vmw_priv->num_displays; ++i) {
                 save = &vmw_priv->vga_save[i];
                 vmw_write(vmw_priv, SVGA_REG_DISPLAY_ID, i);