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 6A9D9FE5202 for ; Fri, 24 Apr 2026 10:19:28 +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=M+XcnAmlaaONK1ZLErA/m5Wd0iJnpahgeiSKtQbbAYE=; b=AqvuBrlOfVQwj1EqzFmbLjwwVP hd3JSXUGiDL1n17OdcieLgs5tXKLpnYeXW029dQ19CMeSa/jlMiXkBZHYTB+jkg2AAoB6EuhNLk2g pUQRUSx2N475GcSb+nudRjz8i0iv1BPgpuMbXGSp0ujEUfcOLDGKqLMhfX0qYQPsLtiqjTBj7cOvK OvgfwaPmrgUNPGByDERBjBPTMVgWr/fFIwe9RCN+mJgh3PGlHFF/i2V0N4PyZKXmz3i1YwheP1JhK 2tDlmdepvis5f2VSlAklkEnm5rvxobUaUtJV27xMdw5u19+cvATa4mu0j+Kx0HpP0+rkXQF1LnEEb lKc+aOZg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGDd5-0000000D0aM-11Eq; Fri, 24 Apr 2026 10:19:23 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGDcy-0000000D0Uf-0Nwl for linux-arm-kernel@lists.infradead.org; Fri, 24 Apr 2026 10:19:18 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B7C154174B; Fri, 24 Apr 2026 10:19:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1888BC2BCB4; Fri, 24 Apr 2026 10:19:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777025955; bh=aNX0zEGJyR4omhAYCQYN3diflr9cBelBuF2mFH6r1sI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=NSKPF/6L1iOeTKpG+TAXaJZRtvHoJDHtu0EPg8P8qH/e/o2Ui2bduii2PYLUt+XYV sD+vQsmKIBJQC2olcVH5iVvacfi8uB8/dHwlQorFzAlDMcAqcD3n0U2iaNSw8Qlog7 rB5LaXn5wkwiRXVmYch0h4O+bC7Tl55d5B85Rc9bcbR9hUOXbcz8iZXb9BVmpwKjvN dlZyQcNsOpYD8LgI+ND5K6TmCPHVu8sZeS6dgUsNir2YhFztC1+WdWAz0+vGvjZX/h zDemEt6SX1jQjbIrfRjGJX4IrsdU3s7GgU+sWzE/qa1QrvEfCYxyXV2IWH68gewvtD YmSUgmPk5mmNg== From: Maxime Ripard Date: Fri, 24 Apr 2026 12:18:45 +0200 Subject: [PATCH v3 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: <20260424-drm-mode-config-init-v3-5-8b68d9db0d8b@kernel.org> References: <20260424-drm-mode-config-init-v3-0-8b68d9db0d8b@kernel.org> In-Reply-To: <20260424-drm-mode-config-init-v3-0-8b68d9db0d8b@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=aNX0zEGJyR4omhAYCQYN3diflr9cBelBuF2mFH6r1sI=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDJmvnbvKFXQ8VfeKxlTPP/BDz01t8s9ftR8+W3pPmbG3s UrpWWVwx1QWBmFOBlkxRZYnMmGnl7cvrnKwX/kDZg4rE8gQBi5OAZhIgD9jnfWZjfrVx66VvdrH HmEtX+uqYLDfTOHztkjOMOtHU5+vK+ePLxA+2zB1duTyJLn0OZoTGBu2bDDyvv/rd+aOlyK3s9/ NXRZ1UPvPu8DHuoZPtvbsZzDc5pTL1pd4n/nlFz+7cjbzafkA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260424_031916_201186_3D9301A2 X-CRM114-Status: GOOD ( 10.49 ) 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 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; -- 2.53.0