[PATCH v2 1/2] drm/mediatek: Fix iommu fault by swapping FBs after updating plane state

[AngeloGioacchino Del Regno]

Il 09/07/23 18:26, Jason-JH.Lin ha scritto:
> According to the comment in drm_atomic_helper_async_commit(),
> we should make sure FBs have been swapped, so that cleanups in the
> new_state performs a cleanup in the old FB.
> 
> So we should move swapping FBs after calling mtk_plane_update_new_state(),
> to avoid using the old FB which could be freed.
> 
> Fixes: 1a64a7aff8da ("drm/mediatek: Fix cursor plane no update")
> Signed-off-by: Jason-JH.Lin <jason-jh.lin at mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>