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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 79B9DEA4FA4 for ; Mon, 23 Feb 2026 10:58:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3BC6410E34A; Mon, 23 Feb 2026 10:58:44 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="aj1Uq+jE"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 76F1910E34A; Mon, 23 Feb 2026 10:58:43 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 1A10641750; Mon, 23 Feb 2026 10:58:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 725D0C116C6; Mon, 23 Feb 2026 10:58:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771844323; bh=QeUhpW5ZHW9W03OdaYVWS7lJzgfUrHq85mrNLwMR8Vk=; h=Date:From:To:Subject:In-Reply-To:References:Cc:From; b=aj1Uq+jELXnhsmWirdvYXtFjNwW/Rep8UbqYN8xtGttRFRcgPABYThU4kqtQkUdbj oCqFah1xawKiFHLvUx6BSDEPpDEZ7HHvL+qDCu6x/+KA4b+n8b5kCJoC3mlSQgZ2kH mvA3ltgbo0NBovsEGT473nQ1rM/uAPc4+YnGeg2vsTSkzfcH9YSzsb9CiXJVEMixKp MzqbqwwuakbbHRHvg/Ro0rT/FftY1XwvnF5vWJpUlvXwMyINy9SWC6K+e07O57JDr6 lGWLTC4WQnN8g/KM6SMVUFBGl/raTGAmbutKnkh9uvHRLf8g+vniJA6mj6FMrsYVwb bnXy15uAZMPeg== Message-ID: <37669584817bdca3d569e80047c94949@kernel.org> Date: Mon, 23 Feb 2026 10:58:40 +0000 From: "Maxime Ripard" To: "Nicolas Frattaroli" Subject: Re: [PATCH v8 06/20] drm/display: hdmi-state-helper: Try subsampling in mode_valid In-Reply-To: <20260216-color-format-v8-6-5722ce175dd5@collabora.com> References: <20260216-color-format-v8-6-5722ce175dd5@collabora.com> Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, kernel@collabora.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, "Alex Deucher" , "Andrzej Hajda" , "Andy Yan" , =?utf-8?b?Q2hyaXN0aWFuIEvDtm5pZw==?= , "David Airlie" , "Dmitry Baryshkov" , "Harry Wentland" , =?utf-8?b?SGVpa28gU3TDvGJuZXI=?= , "Jani Nikula" , "Jernej Skrabec" , "Jonas Karlman" , "Jonathan Corbet" , "Joonas Lahtinen" , "Laurent Pinchart" , "Leo Li" , "Maarten Lankhorst" , "Maxime Ripard" , "Neil Armstrong" , "Rob Herring" , "Robert Foss" , "Rodrigo Siqueira" , "Rodrigo Vivi" , "Sandy Huang" , "Sascha Hauer" , "Simona Vetter" , "Thomas Zimmermann" , "Tvrtko Ursulin" Content-Transfer-Encoding: 7bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On Mon, 16 Feb 2026 14:01:20 +0100, Nicolas Frattaroli wrote: > drm_hdmi_connector_mode_valid assumes modes are only valid if they work > with RGB. The reality is more complex however: YCbCr 4:2:0 > chroma-subsampled modes only require half the pixel clock that the same > mode would require in RGB. > > > [ ... ] Reviewed-by: Maxime Ripard Thanks! Maxime