From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6449CC433E0 for ; Tue, 30 Mar 2021 06:56:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 36D6D61989 for ; Tue, 30 Mar 2021 06:56:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230294AbhC3Gzr (ORCPT ); Tue, 30 Mar 2021 02:55:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231299AbhC3GzW (ORCPT ); Tue, 30 Mar 2021 02:55:22 -0400 Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76F5CC061762; Mon, 29 Mar 2021 23:55:22 -0700 (PDT) Received: by mail-lf1-x134.google.com with SMTP id o126so22210325lfa.0; Mon, 29 Mar 2021 23:55:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version; bh=1jsWOxoyQCfkTr5+5+z2lN/kkkTcVyNslggcaR8Rk2c=; b=izuMf6e/BLLxHjV5UU54CW7NNsqwSVf0eKAMlC+1b4+sLursxvOB8k0lFWd90wlUJc sOpX5nS77HyPpZhoxS4Kt3Esu3JBD9NahRCU8+gcTnzNUlRUqRbDrMWhHPQ28dB+8nmd GHZeo2TGa6iTxJQek+yB8X+tV1OavGqOz/WEV7oiVvyB8HMqSG74dnU/EacBct/Il56f m6KfDNIdYztG3E9oDqubqTmq+YDsNc1MGFtOFIluHOezKOcWeA2P6ogjY1SXOkQPS5Pz qkws9qoQWTtcvkxYmRJkRBJzL36lcY/LD7+Ant4yGrQfHmaLur20uqhxv0rH+cmDSWj9 f7+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version; bh=1jsWOxoyQCfkTr5+5+z2lN/kkkTcVyNslggcaR8Rk2c=; b=g1dmOy/NtICeXlU1Ipr2bkixb+GbLzQIa0IdoQJ/n4kV3pzBZ79OI5CFtj0ozBzFD4 EMhbGde2LcOMwabhWsxVAarnYmuMnQR8bNMK6mG/u/Fj6DBNFX8ecb+y6TGrrVk0EvyH bMHMScJun4Op6VY+PeBnZAx+EBQ2ITBR4TePPLDUd9TkS1s13bBH27BC2ogVIUm3ik98 RhuhtuZsGCrOl2AAATOqa4aqfMYTBDU+HjHR5P3IjeIhPRFYvE1VT1L27Y+XNDFuonA2 PHLyuvuGzv1Zat+Ot6+75hLoeOwc/nYzBF+Sz+eFawUmvNU7yj7nRPqh1to3A5lOQSln m83A== X-Gm-Message-State: AOAM530WiCXbjD8wkl932Xz1NZjQjdPJJAwWug2ycA8R409sbwF7EfM6 lvLAm6/t+7HxH4uTmYZTAc0= X-Google-Smtp-Source: ABdhPJx0HuuT53YJq6EkxNoywPsAENHibGEd6ZjdO3S1YqjgBzCAuJ1csyt80CVEqKwBP3fN/M25rQ== X-Received: by 2002:ac2:4205:: with SMTP id y5mr18633234lfh.375.1617087321043; Mon, 29 Mar 2021 23:55:21 -0700 (PDT) Received: from eldfell ([194.136.85.206]) by smtp.gmail.com with ESMTPSA id q3sm2080022lfp.233.2021.03.29.23.55.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Mar 2021 23:55:20 -0700 (PDT) Date: Tue, 30 Mar 2021 09:55:10 +0300 From: Pekka Paalanen To: Simon Ser , Paul Cercueil Cc: Thomas Zimmermann , David Airlie , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, od@zcrc.me, Maxime Ripard , stable@vger.kernel.org Subject: Re: [PATCH] drm: DON'T require each CRTC to have a unique primary plane Message-ID: <20210330095510.4c6432f7@eldfell> In-Reply-To: References: <20210327112214.10252-1-paul@crapouillou.net> <20210329140731.tvkfxic4fu47v3rz@gilmour> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; boundary="Sig_/Ll+nnIQGkWAZjFxx5fyo+ff"; protocol="application/pgp-signature" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Sig_/Ll+nnIQGkWAZjFxx5fyo+ff Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Mon, 29 Mar 2021 15:36:27 +0000 Simon Ser wrote: > On Monday, March 29th, 2021 at 5:32 PM, Paul Cercueil wrote: >=20 > > Making the second plane an overlay would break the ABI, which is never > > something I'm happy to do; but I'd prefer to do it now than later. =20 >=20 > Yeah, I wonder if some user-space depends on this behavior somehow? >=20 > > I still have concerns about the user-space being "clever" enough to > > know it can disable the primary plane. Can e.g. wlroots handle that? =20 >=20 > wlroots will always pick the first primary plane, and will never use > overlays. The plan is to use libliftoff [1] to make use of overlay > planes. libliftoff should already support the scenario you describe. >=20 > I think Weston supports that too. Weston supports overlays, but I don't think it will try without "the" primary plane, IIRC. I'd need to verify. I'm not quite sure what Weston would do with multiple primary planes. It probably picks one for a CRTC ahead of time, and then sticks to it, always using it. But if Weston never worked with a driver to begin with, it also can't regress, so you're safe. Thanks, pq >=20 > [1]: https://github.com/emersion/libliftoff > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel --Sig_/Ll+nnIQGkWAZjFxx5fyo+ff Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEJQjwWQChkWOYOIONI1/ltBGqqqcFAmBiy04ACgkQI1/ltBGq qqe2JQ//Q12xC+K+PQC1SxJESBwT4t1YaA85MpemH6/+/66zluM5BqGAyC3Yi/bT YaTeWCrF2wbRx+Ei8aSymFHWypf9D2/eYz2vXra8oYxP3wrGtIM6a4hHo+oCC+XG TEBtdcvatzWNVLcxs3p0Y6Pe6lgKZr5uPkA/3nrU2FzRkaWIuhs8akYB+KqNv19r oyYg1Wdcvd57s0OhwcbNZOPuPEt/U5X0gY5HB4LV8v98oPdixrN+4z4ysXgCq2Ka PvR0kOEkDPSYO2e9KCMthq6lq1J6kcDpd61Jb+sDpUVRnae/s4rr9zD6ddqWgycD ljw0yuD+c+F6QNYwIIz2NU8uGSfFyUGZAcJfwjZJni4ieG66XEI8nhqHPT4V7qZB r2n2wx4URDzUdnGoo3XmqO/TA1szHr5aGfwIOIktKVT9l3Gr/ZOptPzRlzjcOc4P gAjQAhcaHlYYPvHhx1+ainKx0KsJ1hG2CcHGH+7KlglX7DuDCpjTGTg46j+LSrUy 4w6EaLwZgee9vCtH9lH55RnAtyL3hbofnlZmNaUTf/0jAKU7LiV3nqkEAQH9ffoP HtucrchZO1yqTIdLRY9PITwqKsHOrkcoQP/xkHjyzanmLFYBo+zdyp1/dU99rl9A Fltv1H3pi7+6+33jb8JN8lnZBC8t3zJVMjugi92D8jAP8xzHRjw= =gBJ/ -----END PGP SIGNATURE----- --Sig_/Ll+nnIQGkWAZjFxx5fyo+ff--