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 08CC8EBFD30 for ; Mon, 13 Apr 2026 10:12:42 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=76fDzNVJYSDVrGkTUxdvp/mv1wblBjOyqunsJgcUsWM=; b=4a1eXxziTFXVkIZ2DdoBwezaaY WnZs512pFq6UejiAe5Q1jXb2H8AqQFqY+Vwesc3W7Btr1FCL4kO6HOEw7oFS4BPSISHDagYdwjbBU ykQhm4OmY5P1x0Ukn55ixkY6PTubKaovVmUq8ReUQdDuXua3yiBSMO/KVWQoo8q1N/9dhgzEEVL/M 2o87dEG/fZMVp6qc6im4ky+SRyAaL/qZ9Hw4F9RMG4adU4m/z+pNnzgSpCoR1nuKAmWref4/C3r6F /3eZgeEeH2Yp0SX7ViIo5t4VuK0Ndwmuw+n/sgBPG5wDz4KImd957FrU3tZYPm/vUw7pAVk4zOV3N vm1vJzzg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCEHV-0000000FTFM-24Q9; Mon, 13 Apr 2026 10:12:37 +0000 Received: from sender4-pp-f112.zoho.com ([136.143.188.112]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCEHS-0000000FSpN-29QL; Mon, 13 Apr 2026 10:12:36 +0000 ARC-Seal: i=1; a=rsa-sha256; t=1776075092; cv=none; d=zohomail.com; s=zohoarc; b=BzK7pbbbtL0/RC583Da4ed82n0lff6IzUcoX+Izh3vJgInY2eKPFV/WsJ0JTtEP7qnNJRYkpi+zB0H8AO/rRLShCBukvu7c+8h1144odvcAhRpgNEqpR+Vhbwy2l6dS0wJgtHLNAmK7/wJ3dmIA1DM1EmpgG3kxxhLI5RB+CZt8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1776075092; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=76fDzNVJYSDVrGkTUxdvp/mv1wblBjOyqunsJgcUsWM=; b=QiVYLIzzfAaEGx1hpPU2hTpLctgT9AzZP/5FqH0Etq574pJjWqZ6/tdZ3DMfJk53NuOxgPCHI6W50tCeB93motguxEa5eP2T33Fx0mQh2vqquvmx+2FkfgkEgdGNmp+93I+MTbM1Mu1Q8D/AFEEcEWfzXhvBC0/SZIg/J0YrgQE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=nicolas.frattaroli@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1776075092; s=zohomail; d=collabora.com; i=nicolas.frattaroli@collabora.com; h=From:From:Date:Date:Subject:Subject:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Message-Id:References:In-Reply-To:To:To:Cc:Cc:Reply-To; bh=76fDzNVJYSDVrGkTUxdvp/mv1wblBjOyqunsJgcUsWM=; b=MUXuFQM4uJ9ru9EMEqkiQWOyhLULiMsvuPJSkMl8HXJy1orXoTPzahMwuyc5XiPG PvqVPW0+jDcw71KVXObXA22E+9BvEdLWNucx5FBtW4MWopCpjQRzmHiQyr1KlRVpMdY hT+ODRV/J8PstN5lXHOXoHem6tMgM32BasAZ8A4A= Received: by mx.zohomail.com with SMTPS id 1776075090846920.0376394014768; Mon, 13 Apr 2026 03:11:30 -0700 (PDT) From: Nicolas Frattaroli Date: Mon, 13 Apr 2026 12:07:40 +0200 Subject: [PATCH v13 26/27] drm/bridge: Document bridge chain format selection MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260413-color-format-v13-26-ab37d4dfba48@collabora.com> References: <20260413-color-format-v13-0-ab37d4dfba48@collabora.com> In-Reply-To: <20260413-color-format-v13-0-ab37d4dfba48@collabora.com> To: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Dmitry Baryshkov , Sascha Hauer , Rob Herring , Jonathan Corbet , Shuah Khan Cc: kernel@collabora.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-doc@vger.kernel.org, Nicolas Frattaroli X-Mailer: b4 0.15.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260413_031234_714598_645EB706 X-CRM114-Status: GOOD ( 17.94 ) 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 The bridge chain format selection behaviour was, until now, undocumented. With the addition of the "color format" DRM property, it's not sufficiently complex enough that documentation is warranted, especially for driver authors trying to do the right thing. Add a high-level overview of how the process is supposed to work, and mention what the display driver is supposed to do if it wants to make use of this functionality. Reviewed-by: Maxime Ripard Signed-off-by: Nicolas Frattaroli --- Documentation/gpu/drm-kms-helpers.rst | 6 ++++++ drivers/gpu/drm/drm_bridge.c | 40 +++++++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/Documentation/gpu/drm-kms-helpers.rst b/Documentation/gpu/drm-kms-helpers.rst index b4a9e5ae81f6..bf5a9d909cf3 100644 --- a/Documentation/gpu/drm-kms-helpers.rst +++ b/Documentation/gpu/drm-kms-helpers.rst @@ -169,6 +169,12 @@ Bridge Operations .. kernel-doc:: drivers/gpu/drm/drm_bridge.c :doc: bridge operations +Bridge Chain Format Selection +----------------------------- + +.. kernel-doc:: drivers/gpu/drm/drm_bridge.c + :doc: bridge chain format selection + Bridge Connector Helper ----------------------- diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 5acd6bf84ae2..4cdc3c944f89 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -198,6 +198,46 @@ * driver. */ +/** + * DOC: bridge chain format selection + * + * A bridge chain, from display output processor to connector, may contain + * bridges capable of converting between bus formats on their inputs, and + * output formats on their outputs. For example, a bridge may be able to convert + * from RGB to YCbCr 4:4:4, and pass through YCbCr 4:2:0 as-is, but not convert + * from RGB to YCbCr 4:2:0. This means not all input formats map to all output + * formats. + * + * Further adding to this, a desired output color format, as specified with the + * "color format" DRM property, might not correspond 1:1 to what the display + * driver should set at its output. The bridge chain it feeds into may only be + * able to reach the desired output format, if a conversion from a different + * starting format is performed. + * + * To deal with this complexity, the recursive bridge chain bus format selection + * logic starts with the last bridge in the chain, usually the connector, and + * then recursively walks the chain of bridges backwards to the first bridge, + * trying to find a path. + * + * For a display driver to work in such a scenario, it should read the first + * bridge's bridge state to figure out which bus format the chain resolved to. + * If the first bridge's input format resolved to %MEDIA_BUS_FMT_FIXED, then its + * output format should be used. + * + * Special handling is done for HDMI as it relates to format selection. Instead + * of directly using the "color format" DRM property for bridge chains that end + * in HDMI bridges, the bridge chain format selection logic will trust the logic + * that set the HDMI output format. For the common HDMI state helper + * functionality, this means that %DRM_CONNECTOR_COLOR_FORMAT_AUTO will allow + * fallbacks to YCBCr 4:2:0 if the bandwidth requirements would otherwise be too + * high but the mode and connector allow it. + * + * For bridge chains that do not end in an HDMI bridge, + * %DRM_CONNECTOR_COLOR_FORMAT_AUTO will be satisfied with the first output + * format on the last bridge for which it can find a path back to the first + * bridge. + */ + /* Protect bridge_list and bridge_lingering_list */ static DEFINE_MUTEX(bridge_lock); static LIST_HEAD(bridge_list); -- 2.53.0