This seems to cause flickering and lock-ups for a wide range of users.
Revert until we've found a proper fix for the flickering and lock-ups.

This reverts commit 36cc549d59864b7161f0e23d710c1c4d1b9cf022.

Cc: Shirish S <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: [email protected]
Signed-off-by: Harry Wentland <[email protected]>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 28 -------------------
 1 file changed, 28 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 3848d6823196..6f92a19bebd6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4982,30 +4982,6 @@ static int dm_update_planes_state(struct dc *dc,
        return ret;
 }
 
-static int dm_atomic_check_plane_state_fb(struct drm_atomic_state *state,
-                                         struct drm_crtc *crtc)
-{
-       struct drm_plane *plane;
-       struct drm_crtc_state *crtc_state;
-
-       WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
-
-       drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) {
-               struct drm_plane_state *plane_state =
-                       drm_atomic_get_plane_state(state, plane);
-
-               if (IS_ERR(plane_state))
-                       return -EDEADLK;
-
-               crtc_state = drm_atomic_get_crtc_state(plane_state->state, 
crtc);
-               if (crtc->primary == plane && crtc_state->active) {
-                       if (!plane_state->fb)
-                               return -EINVAL;
-               }
-       }
-       return 0;
-}
-
 static int amdgpu_dm_atomic_check(struct drm_device *dev,
                                  struct drm_atomic_state *state)
 {
@@ -5032,10 +5008,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
                struct dm_crtc_state *dm_new_crtc_state = 
to_dm_crtc_state(new_crtc_state);
                struct dm_crtc_state *dm_old_crtc_state  = 
to_dm_crtc_state(old_crtc_state);
 
-               ret = dm_atomic_check_plane_state_fb(state, crtc);
-               if (ret)
-                       goto fail;
-
                if (!drm_atomic_crtc_needs_modeset(new_crtc_state) &&
                    !new_crtc_state->color_mgmt_changed &&
                    (dm_old_crtc_state->freesync_enabled == 
dm_new_crtc_state->freesync_enabled))
-- 
2.17.0

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