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Before "drm/drm_blend: allow blend mode property without PREMULTI", userspace would have to assume that only PREMULTI was supported by drivers that didn't expose the blend mode property. But now userspace shouldn't rely on that, as they can't count with drivers always supporting PREMULTI. Warn if a driver exposes pixel formats with alpha but doesn't expose the blend mode property. This way userspace doesn't have to guess. Drivers triggering this warning must be fixed. Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com> Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com> Reviewed-by: Daniel Stone <daniels@collabora.com> Link: https://patch.msgid.link/20260526181700.25310-3-leandro.ribeiro@collabora.com Signed-off-by: Daniel Stone <daniels@collabora.com>