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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 31B5CD711D5 for ; Mon, 22 Dec 2025 09:48:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=b6lgQ+16oM+JVr3hOB8rFTOn5rMT6DuP3GnMyn+YIIE=; b=kYw2HmEwIl8SGsMFmx+XvCBgVw IfYNNC5qEBl4Cc/fjCEa/cKaIsKYmD2qqahVAqDaWalrnddJ2A/dPPmnSDdaurVLTKb8DNkpng/e5 2Q/DYmmLRCvhBStc8sFO1O9DfDumMwh8uvbCHmVRR7kARtGuloPC9Kcs//TvZgIjZx6fqO1xpKVaC vs6G+MLj3rFrDWWif5lBnO4iwq1kHtwPES16wDXcCHZxBn8AV2/P3Zg9SK/qAoQKNMz1vx+NKCSAU hrZ4R6xHcQ6QIJgZMRZ+1dzpZID3HEnI1Vqx3gRcWvrCagSgDcTCheAwN9lm2LVlhyQjuWatoEiaR tjE0rlXg==; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251222_014824_707791_A1C4083D X-CRM114-Status: GOOD ( 18.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 13/11/2025 22:37, Sean Anderson wrote: > The graphics plane does not support XRGB8888, which is the default mode > X uses for 24-bit color. Because of this, X must be set to use 16-bit > color, which has a measurable performance penalty. Make the video plane > the primary plane as it natively supports XRGB8888. An alternative > approach to add XRGB8888 to the graphics plane is discussed in [1], as > well as in patch 2. > > [1] https://lore.kernel.org/dri-devel/20250627145058.6880-1-mike.looijmans@topic.nl/ > > > Sean Anderson (3): > drm: zynqmp: Check property creation status > drm: zynqmp: Make the video plane primary > drm: zynqmp: Add blend mode property to graphics plane > > drivers/gpu/drm/xlnx/zynqmp_kms.c | 42 +++++++++++++++++++++++++------ > 1 file changed, 34 insertions(+), 8 deletions(-) > I made a test with pykms and tried this series with a few different things. Afaics with this series the driver behaves as I would expect the driver to behave. It makes sense to have the lower z-order plane as the primary plane, especially as it supports the standard XRGB8888. That said, I don't think there's anything that exactly would make the current way of having GFX as primary wrong... So I still don't see a single obvious solution to this whole issue. A few thoughts: If there is no regression here (i.e. this just has never worked well with X/Weston), might the actual fix be in X/Weston? Is there an actual bug in the xilinx driver? On the other hand, I think it makes sense for drivers to (try to) expose the HW in a common way. XRGB8888 is the standard format, so it makes sense to expose XRGB8888 on primary plane. I think this is how the driver should have behaved from the start. But if changing that now would cause user space regressions, it's not good either. Tomi