From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF8B435CB7C; Fri, 24 Apr 2026 10:19:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777025956; cv=none; b=E8qWCoaZRBgl2cfffzsGoy5RqsZ/hP64aEyLCcKylww1vONZb55qPpatM/Jkzb07teCUF/FMEyIBXPqqdu+/5SPAyOOjc00kFhPFeikUfRzoPvUrC+54KEkK3JYicPONBSavylOL8eUn04rVlahVWjdqthwYi0yQgSolg2lNbOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777025956; c=relaxed/simple; bh=aNX0zEGJyR4omhAYCQYN3diflr9cBelBuF2mFH6r1sI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Z9cHZAih2MS2VmYasJpAWL5m+NKNWcKVORZdLApoUW6X1jUAg80m7opAn7bMqsjOIAJL3tab5HbE4PAbvids8mz3oSF298Z0NTDpbRWbOWoJB30iOnJEUCd1rluQ2bqEK79lW8Af7MeM2uFCptF3zFzAl+iwrS+HaUiAgYWiKoA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NSKPF/6L; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NSKPF/6L" 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() Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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