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 D562ECD5BB1 for ; Tue, 26 May 2026 17:20:53 +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=vmAxlo1wPpVUGFi4z8FBEYgHX8eETYEQ7eEa1NRb4nY=; b=RIXvjzfr7Kx7+jPNYhsp1e6NzR hfXk16V+nLwNyi8hWWID2gVe80BHUStMEPOSAsoaJLhwFkTtVV39tJQfZgYm6aSztJWrldGSQ5rBN FLigGbUJi0XE0tq2f0tdLGHf4+zjsCFMYyu8BCW16ZkzM80F9YuKagsRY+MQZcgejlMH9Mi37qVTq Iwkt8oHNcOTmq9nISMZOw8U2Xyc1Ls3sjKhhvsbt2yDegXbcFEHEW0Q0FY+owTmvAAsVXvmw5qp4L 4FCGsTZ8pOF6lAdpfB33QKwrEmb/0XDS1o2GQhr21nNETtTbyXxIy/0QR4JyZKhTO+QwfyAQ+boiG FeVd1QBA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wRuvk-00000002ZNa-0ia8; Tue, 26 May 2026 16:47:00 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wRuvQ-00000002Z8o-3hqK for linux-arm-kernel@lists.infradead.org; Tue, 26 May 2026 16:46:42 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8BC71407DA; Tue, 26 May 2026 16:46:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B384D1F00A3E; Tue, 26 May 2026 16:46:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779814000; bh=vmAxlo1wPpVUGFi4z8FBEYgHX8eETYEQ7eEa1NRb4nY=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=ccr+aUxQl8B8VP26+PznQjAM5jvmJNlSdE8U9y1ip5BaMLJntllTX7BY3Nr43ByYR 3I7qL/PTr0QwCrtyQp5W+bo5LH0b+yhWamg9kaS/Fw6GLalmo3/TqXzvjcAl9nVoTn t8pbV74ygCP68BufoMuGEOi+/SGvtWM7zzOAXpKfVmwYbW2Tm5LKKOWmxbPJWLA57b rSEhj3pPq4GQvInyObJ0rsAxTMjEppCSJ4qJqErb5Uii0gr0M+ohJ5g6VIUDtjpb+D dfh5vciNbOM7B3WO74qXzJZivvN3UwICa9CBKQ43vqHiJAJxStDMBJJyEzSMzn3vBU WScG04N75WgRQ== From: Maxime Ripard Date: Tue, 26 May 2026 18:46:17 +0200 Subject: [PATCH v6 05/19] 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: <20260526-drm-mode-config-init-v6-5-852346394200@kernel.org> References: <20260526-drm-mode-config-init-v6-0-852346394200@kernel.org> In-Reply-To: <20260526-drm-mode-config-init-v6-0-852346394200@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=1438; i=mripard@kernel.org; h=from:subject:message-id; bh=p9ZaVQhU6x2BUkTWwGqZUaX+oUcICWz2dxNRq772dNc=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDFmi5yICquxP9H7QShWVXMCSd7vposCC4Dzt1JqfSx6dF OiqXWTfMZWFQZiTQVZMkeWJTNjp5e2LqxzsV/6AmcPKBDKEgYtTACbCrsBYZ/nwX9WGoDVKv2vC bjQvNb9///Z62doejbvN/TxBeZqHE8IkZtxlYhThFdlgIOh3tdKFsYarJe3f9J1988I8rvZvE1u oMvX4X9NpIZ7ygitPKZ30zlN6mP9kotbOvJ9v2Q70TLGW9AUA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260526_094640_976953_7854B615 X-CRM114-Status: GOOD ( 10.54 ) 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 Reviewed-by: Thomas Zimmermann 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