Hi,

On 13/2/20 13:01, Enric Balletbo i Serra wrote:
> Commit 920fffcc8912 ("drm/mediatek: update cursors by using async atomic
> update") added support to async updates of cursors by using the new atomic
> interface for that. Unfortunately, introduced two issues. The first one is
> that since then, the drm_atomic_helper_async_commit triggers a WARNING due
> current fb is not the new fb. The second one, is that we get a black screen
> connecting the external display on Elm device and another WARNING due vblank
> wait timed out.
> 
> Swap the fb in mtk_plane_atomic_async_update to fix both issues.
> 
> Fixes: 920fffcc8912 ("drm/mediatek: update cursors by using async atomic 
> update")
> Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
> ---

I just noticed this, which should fix the problem too, so you can ignore this 
patch.

https://patchwork.kernel.org/patch/11379571/

> 
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c 
> b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index 914cc7619cd7..7eb10115e72a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -116,6 +116,7 @@ static void mtk_plane_atomic_async_update(struct 
> drm_plane *plane,
>       plane->state->src_h = new_state->src_h;
>       plane->state->src_w = new_state->src_w;
>       state->pending.async_dirty = true;
> +     swap(plane->state->fb, new_state->fb);
>  
>       mtk_drm_crtc_async_update(new_state->crtc, plane, new_state);
>  }
> 
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