drm/vmwgfx: Perform memory validations only when need full modeset.

For cases when full modeset is not requested like page-flip, skip
memory validation as the topology is not changed.

Signed-off-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 387bb39..3605ac1 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1670,13 +1670,32 @@ static int
 vmw_kms_atomic_check_modeset(struct drm_device *dev,
                             struct drm_atomic_state *state)
 {
-       int ret;
+       struct drm_crtc *crtc;
+       struct drm_crtc_state *crtc_state;
+       bool need_modeset = false;
+       int i, ret;
 
        ret = drm_atomic_helper_check(dev, state);
        if (ret)
                return ret;
 
-       return vmw_kms_check_topology(dev, state);
+       if (!state->allow_modeset)
+               return ret;
+
+       /*
+        * Legacy path do not set allow_modeset properly like
+        * @drm_atomic_helper_update_plane, This will result in unnecessary call
+        * to vmw_kms_check_topology. So extra set of check.
+        */
+       for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
+               if (drm_atomic_crtc_needs_modeset(crtc_state))
+                       need_modeset = true;
+       }
+
+       if (need_modeset)
+               return vmw_kms_check_topology(dev, state);
+
+       return ret;
 }
 
 static const struct drm_mode_config_funcs vmw_kms_funcs = {