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 91AF6CD4F25 for ; Tue, 12 May 2026 13:06:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 21A7710EA9A; Tue, 12 May 2026 13:06:31 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="uUi8PyyW"; 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 6A89B10EAAB; Tue, 12 May 2026 13:06:29 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id DF49660139; Tue, 12 May 2026 13:06:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18A71C2BCF5; Tue, 12 May 2026 13:06:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778591188; bh=OOzvE+PDY+lMMJPx9rpX9siTCSFetWvZ9fVlq7uKBtk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=uUi8PyyWSlUasaCm2U0uzJXbtwFmzzWcaPhcbQ1cWY1JOZS0ZKblaXjz5H3XobsHw NZEJuk7wNJtOxBnPfQ5AR9Ls6MAJWvMoNRqrh6hFZ874XuuM9/AEmuLKNXwvpt1hp1 +tk5136Ff/28HHd2rMQj9e373Rq+rsYb6HZU7nFfLbKvHtlxSJU0JW6QLiCBJvNQgI +/ZP5nZ/QeFpdtxzqjHDgk7fwU9zgds+GFB/qKQF8BWhy979Nn0crxFNojKVs0Nnr9 6hcLspIgO4pVifirFHsMRvuRT+PcHSQddogD2DwIGhLgkh8aLQxJEeKfoQL2kJ7qWt gE02pAWujcpdQ== From: Maxime Ripard Date: Tue, 12 May 2026 15:06:03 +0200 Subject: [PATCH v4 05/20] drm/mode-config: Document drm_private_obj exclusion from drm_mode_config_reset() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260512-drm-mode-config-init-v4-5-591dfdcc1bf9@kernel.org> References: <20260512-drm-mode-config-init-v4-0-591dfdcc1bf9@kernel.org> In-Reply-To: <20260512-drm-mode-config-init-v4-0-591dfdcc1bf9@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 , Simon Ser , Harry Wentland , Melissa Wen , Sebastian Wick , Alex Hung , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Chen-Yu Tsai , Samuel Holland , Dave Stevenson , =?utf-8?q?Ma=C3=ADra_Canal?= , Raspberry Pi Kernel Maintenance Cc: dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Stone , intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, Maxime Ripard , Laurent Pinchart X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1384; i=mripard@kernel.org; h=from:subject:message-id; bh=OOzvE+PDY+lMMJPx9rpX9siTCSFetWvZ9fVlq7uKBtk=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDFnMqnuMvhxQE+VpeMGU8J57zZyE8p83wy+XJkarJN5nZ ZofalTQMZWFQZiTQVZMkeWJTNjp5e2LqxzsV/6AmcPKBDKEgYtTACbS5MhYp/k/+t5GvSWX9u31 Oc0juFzVVof3cc5FrhlNdfsVvobLSExv5iv9mnA1eb5ySJnP6vbVjHXqSvOumJjsmT+v7ncIz4E cWZPTKYuaPwXcLluauWrdhe+Sey+97NKVnm0XorykxPKC/hIA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" drm_mode_config_reset() does not reset drm_private_states by design. 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. Document this expectation. Link: https://lore.kernel.org/dri-devel/aOaQLx-7EpsHRwkH@ideak-desk/ Reviewed-by: Laurent Pinchart 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 66f7dc37b597..c33382a38191 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. + * + * Note that &drm_private_obj structures are expected to be stable across + * suspend/resume cycles, and drm_mode_config_reset() does not affect these + * structures. */ void drm_mode_config_reset(struct drm_device *dev) { struct drm_crtc *crtc; struct drm_colorop *colorop; -- 2.54.0