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 8B363FD4F02 for ; Tue, 10 Mar 2026 16:07:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id EDA8C10E71A; Tue, 10 Mar 2026 16:07:19 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="hQ+hiVNu"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id B648A10E71A for ; Tue, 10 Mar 2026 16:07:18 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 31021600C4; Tue, 10 Mar 2026 16:07:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83836C2BC9E; Tue, 10 Mar 2026 16:07:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773158837; bh=pWJGn98h8ZYkxcFli5V1DyhaDv4pkkzV67j693vyn2g=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=hQ+hiVNun7GjFJ85s1FfxfbbCC430nUHV39Z4fFcoYjSx7hET3byrGuEgNDe+BtSh eQy0n3wbRILZL82Vgj6baY24O+MCF4nikjsaFzskgnXdbyEyHosEIe/TZWbY3xrr0N t3eRCBevUcDqfRkkJuyAnt+bGhHgB5WkKUt3mpEobaPFnzJsILw1kcDRuP5kWZlLkh ZuDVT6HMw0sWRmO9zd07yKGs4funAOZYqkasvJK0VLiQk62nTxvQSme7t90dxdOz46 FpYWxs0963CnrlN+z3mAllaZ6FYlSGs6LUmBtI7Iz0IAikBmrmhthgggjQLz9jCOJv byKmQMwrV1kFg== From: Maxime Ripard Date: Tue, 10 Mar 2026 17:06:55 +0100 Subject: [PATCH 03/14] drm/mode-config: Mention drm_mode_config_reset() culprits MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260310-drm-mode-config-init-v1-3-de7397c8e1cf@kernel.org> References: <20260310-drm-mode-config-init-v1-0-de7397c8e1cf@kernel.org> In-Reply-To: <20260310-drm-mode-config-init-v1-0-de7397c8e1cf@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Jonathan Corbet , Shuah Khan , Dmitry Baryshkov , Jyri Sarha , Tomi Valkeinen , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec Cc: dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Maxime Ripard X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1400; i=mripard@kernel.org; h=from:subject:message-id; bh=pWJGn98h8ZYkxcFli5V1DyhaDv4pkkzV67j693vyn2g=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDJkbHJfOPj3b1fOw1bqrBd3iy67cWGWWYsO9g0cjRbzcR fy4mGR/x1QWBmFOBlkxRZYnMmGnl7cvrnKwX/kDZg4rE8gQBi5OAZhI/UTGhoU33j9m3rM9Yo7/ pUU2Ms9Onf0r+jj8VP+f93s/cFls/flZmfO/1MveqCyBHRYlwidmsDA2zC64f4vh/E1XDpHHjs7 l/8/fn8/ze3/Y4RDV/gUn6kMlPToOqO89suHBbvuuV3aPFmt/AQA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" drm_mode_config_reset() has the expectation that drm_private_states are not reset. This is especially significant for the DP MST and tunneling code that expect to be preserved across a suspend/resume cycle, where drm_mode_config_reset() is also used. Let's document this expectation. Link: https://lore.kernel.org/dri-devel/aOaQLx-7EpsHRwkH@ideak-desk/ Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_mode_config.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index 84ae8a23a36786705fea7c0eafd7f20813b7c8f9..54c27376f9894ef5eee378bb5b1e5fc7049de922 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -187,10 +187,14 @@ int drm_mode_getresources(struct drm_device *dev, void *data, * @dev: drm device * * This functions calls all the crtc's, encoder's and connector's ->reset * callback. Drivers can use this in e.g. their driver load or resume code to * reset hardware and software state. + * + * It's worth noting that @drm_private_obj structures are expected to be + * stable across suspend/resume cycles, and @drm_mode_config_reset() + * will not affect these structures. */ void drm_mode_config_reset(struct drm_device *dev) { struct drm_crtc *crtc; struct drm_colorop *colorop; -- 2.53.0