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 8C73A10987A4 for ; Fri, 20 Mar 2026 16:27:47 +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=H5jAvpcXwF0Zl+VrVU8z8q5ztgaucjIpCP0dexToyEQ=; b=w2bTB4+PxSXbeqSjQLH3LoKnz7 ir+Rw9tBaHs4E+SsYBnZ/o/PZy1RBSO995hVmQU9DDf9UfDPLmcQpWjF7yMZd4o3ImJRY+E2zg7Oy 05KQu6DuRUF1AlOBGdbAQb4HUHit8zoy/fc6vdjinm/UCT6r8aOQceWlZb0S3VsInvYMVKmciMfuG 9oYGTe5ZzE/Bl97oYp3IAd4+FQlz2uFGcrkn+B6gsSbpBfmdJclswHwSqw+tRE9uA97/QR5LaLqpt c8p0dBDu+IzPNhgCAtlRxg9LHUy3CJlNiGlb68cpSpWkmD2FY22gZtENznpj4PJoQc0XWYqlWBMir cyKiWo/g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w3chL-0000000D7j3-2vWJ; Fri, 20 Mar 2026 16:27:43 +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 1w3chF-0000000D7e5-1UwQ for linux-arm-kernel@lists.infradead.org; Fri, 20 Mar 2026 16:27:39 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 6E4DC44201; Fri, 20 Mar 2026 16:27:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD29FC2BCB2; Fri, 20 Mar 2026 16:27:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774024056; bh=wsgH+JigiQfeFcxwGD7t3o9+hIxvZid3TubvDqbfQKQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=MnyukRsdGM5tALWWow4wXrFdo8tSbj4j8ni/3V46UYr2109ahtsTjO+b8xdEUcYWI B5FJMYYjNoRgcIgBsRxF8+csBoBgS+6LqeDii30a02TOaLREFHylNG/b0do5OgulRX uk/em3q56XPAJnJWUwicAA8LpnyY5y0NwTJ4AcO2XVPr4V0DKDVcERDl+tuHpGEfc3 rK0kS7xWscWDuSxaqOLPIN4F20FcZCis+xH8gNQyPqRGTFvMfi0CrnDdvcdJ1wwHSr GaxwAsRBHzUahnvinIQJekLn9N0AWZdRYeJEctKdrz8xQ24iXt3keg8QHNdSXsHSuI n8e5iAnbkY+TQ== From: Maxime Ripard Date: Fri, 20 Mar 2026 17:27:10 +0100 Subject: [PATCH v2 03/20] 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: <20260320-drm-mode-config-init-v2-3-c63f1134e76c@kernel.org> References: <20260320-drm-mode-config-init-v2-0-c63f1134e76c@kernel.org> In-Reply-To: <20260320-drm-mode-config-init-v2-0-c63f1134e76c@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 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1447; i=mripard@kernel.org; h=from:subject:message-id; bh=wsgH+JigiQfeFcxwGD7t3o9+hIxvZid3TubvDqbfQKQ=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDJl7S1Nstz3decpi2d3w+dyr5Sep10g8NjdLdNj4TvVkR dCc3sVbOqayMAhzMsiKKbI8kQk7vbx9cZWD/cofMHNYmUCGMHBxCsBE+vUYa3iSZ4dmqL/Xb0pU aF57vk5KrffSjgPs3nUaSq8YoldPLlV6o/bufc2bR9+75RnYukOmMjY8v2TSmPH1tu5y5rSOaW+ /3hGa0P4geHpjnTp3SDDXjcVf9XfxtOklnQ559/qG3ITr7+cCAA== 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-20260320_092737_469975_9BDE7B77 X-CRM114-Status: UNSURE ( 9.84 ) X-CRM114-Notice: Please train this message. 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. Let's 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 66f7dc37b5970c0a08f8dde008aef56376c59f37..cba527571ca66d3aa6dc652c87e03a19815d1d41 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