Revert "drm/amd/display: disable CRTCs with NULL FB on their primary plane (V2)"

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 <shirish.s@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 2edabab..4e2f379 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4848,30 +4848,6 @@ 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)
 {
@@ -4895,10 +4871,6 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
                goto fail;
 
        for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
-               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)
                        continue;