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a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779181341; c=relaxed/simple; bh=OOzvE+PDY+lMMJPx9rpX9siTCSFetWvZ9fVlq7uKBtk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=V6JKOo1ziOLFe0GNMID6CHGpOhjWqoPLmEdQyFGaxIB7O1X7kwQJoBox1mlRlbZkMQVWbO22zgC3Oz0NZf2GSeoT+eba7tCaimSzD/IrvSjT0Fep1td80om3gJV/DmDgYvZhYl+l0X4PQRh5esBa0k12ajvjs/SUGIVnj+qbJGs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y4cGV95U; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6442CC2BCF5; Tue, 19 May 2026 09:02:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1779181340; bh=OOzvE+PDY+lMMJPx9rpX9siTCSFetWvZ9fVlq7uKBtk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Y4cGV95UPDj7Y9KGJgAxd9rqvaQulKEX/+tIhrOy2Q+fcuwJ4pihVzVLN3JYmfqxQ r6BZEBLbm8vw6LspNUuEQ2Ock+xGPP8EhmGMikgOaUN6N5J2GLjXTCbI3eSY8JiV+K r7BbGSupl128A8bN5Fc32DykYtEWwohNCnIhiAAJx2pH3a/iGsu6nuumLjimtiSKSu n/xPW+u4RoDJLqT5IAjj495Ez3tN8QkRH7hp/s0Oikn/I7BC7dC9QhSZqrjBNJU0PX Z/eZE+phuV+0HQDndlrwfZItYxHXiGQaD/rxjDElnK+fDqvLrzirSX+eh4zuP6++sj tesI/alMZ21BA== From: Maxime Ripard Date: Tue, 19 May 2026 11:01:47 +0200 Subject: [PATCH v5 05/19] drm/mode-config: Document drm_private_obj exclusion from drm_mode_config_reset() Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20260519-drm-mode-config-init-v5-5-388b03321e38@kernel.org> References: <20260519-drm-mode-config-init-v5-0-388b03321e38@kernel.org> In-Reply-To: <20260519-drm-mode-config-init-v5-0-388b03321e38@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=owGbwMvMwCmsHn9OcpHtvjLG02pJDFk8ar/L/PIuBqXVas85f/zTBoPfj0LMhH7POHwq4cMS7 rNVjJaKHVNZGIQ5GWTFFFmeyISdXt6+uMrBfuUPmDmsTCBDGLg4BWAia1Yw1odIhv8yY+yaUvL6 Y/G6Wpl3r1zO/WCaf3D/7Lurt2VsK1wysUi+wvPEJYfa9Y9bnQ3TfjLWVwnvKv097YfDu8Nbs/k 5pZ1TmyRSv5559Xrlx628SdNq2iYrRz6rCZNpczsRIXb7oaYGAA== X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= 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 Reviewed-by: Thomas Zimmermann --- 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;