From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) (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 5D0831991CB; Tue, 31 Dec 2024 10:40:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735641630; cv=none; b=OJBki/2zgIgI292JOoFIfnPBwIytPU88xGHcGAcVqbjWSVaedzNWPdgeZjSEvJMOb6l5a3YEyEyaRZ2lBsml/Ua3N/gmSOwNZsVqcEiKeTXRrgfXR6NnQFeseN7J5becJ0MIuYLCz9qjWS5FZC1PzFw/MV34cUworFCVrWD/g6U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735641630; c=relaxed/simple; bh=9Egth4iHEs30CbICXzLRaqddoCOB3qYv2dcefV1KR8o=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AM5H3qJfezsB1BObwSDlBRuigiphCZkpVQ1y5GqrUlDUkmKGAVg/J1iPgumNGs4xTYcvSEdtUOag8gdQvj8U6qVTHpmL0Ri8MPGpx6s3sUHWnAWHOCXytTwdB5jNw/yHDQ/QG0e1y1ap2UwLm/LbjRZW7+vM/Qw8fPBCijEUTtw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=kRlUawNt; arc=none smtp.client-ip=217.70.183.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="kRlUawNt" Received: by mail.gandi.net (Postfix) with ESMTPSA id 2283DFF805; Tue, 31 Dec 2024 10:40:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1735641621; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wdJRFPYJn2qqkOdPun4N5SXzAsUkIySnz0tR0H9uV8o=; b=kRlUawNtU0Xjy9Zt9zORzIia6GHO6oAv8REIkF+pDHVszF9rOGwMdqNOwfqHBhP4mqECv7 Ga/POKxglQcPJ2Pj2A4yeanVcDy9aXMPHSEgg6DDWAMsfikzffOYlFSCOISfuDSxQPKQtB 2oljVjOEA9en7kD019nnb2N83WwYO7xu5tZtuBZA/i3wEdfRA7fQuXqYwfejDDQodeHGz9 Z57MzJkSGHGvKvdGVuKblP1xBu3txUngtThoQAROl8lawXKBzg8YJyFeiBakRb/od+f8bI eO6RCnfmIQJfqorXoB5PqJci1tKGg3Rr/gP84B1f8cTO1qrN45Hlo5SfhW6iaw== From: Luca Ceresoli Date: Tue, 31 Dec 2024 11:39:56 +0100 Subject: [PATCH v5 02/10] drm/encoder: add drm_encoder_cleanup_from() 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: <20241231-hotplug-drm-bridge-v5-2-173065a1ece1@bootlin.com> References: <20241231-hotplug-drm-bridge-v5-0-173065a1ece1@bootlin.com> In-Reply-To: <20241231-hotplug-drm-bridge-v5-0-173065a1ece1@bootlin.com> To: Simona Vetter , Inki Dae , Jagan Teki , Marek Szyprowski , Catalin Marinas , Will Deacon , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Daniel Thompson , Andrzej Hajda , Jonathan Corbet Cc: Paul Kocialkowski , Maxime Ripard , Dmitry Baryshkov , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Thomas Zimmermann , David Airlie , =?utf-8?q?Herv=C3=A9_Codina?= , Thomas Petazzoni , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, Paul Kocialkowski , Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-Sasl: luca.ceresoli@bootlin.com Supporting hardware whose final part of the DRM pipeline can be physically removed requires the ability to detach all bridges from a given point to the end of the pipeline. Introduce a variant of drm_encoder_cleanup() for this. Signed-off-by: Luca Ceresoli --- Changes in v5: none Changes in v4: none Changes in v3: none Changed in v2: - fix a typo in a comment --- drivers/gpu/drm/drm_encoder.c | 21 +++++++++++++++++++++ include/drm/drm_encoder.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c index 8f2bc6a28482229fd0b030a1958f87753ad7885f..472dfbefe2960924a4e83bec425af8c7ef5f5265 100644 --- a/drivers/gpu/drm/drm_encoder.c +++ b/drivers/gpu/drm/drm_encoder.c @@ -207,6 +207,27 @@ void drm_encoder_cleanup(struct drm_encoder *encoder) } EXPORT_SYMBOL(drm_encoder_cleanup); +/** + * drm_encoder_cleanup_from - remove a given bridge and all the following + * @encoder: encoder whole list of bridges shall be pruned + * @bridge: first bridge to remove + * + * Removes from an encoder all the bridges starting with a given bridge + * and until the end of the chain. + * + * This should not be used in "normal" DRM pipelines. It is only useful for + * devices whose final part of the DRM chain can be physically removed and + * later reconnected (possibly with different hardware). + */ +void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge) +{ + struct drm_bridge *next; + + list_for_each_entry_safe_from(bridge, next, &encoder->bridge_chain, chain_node) + drm_bridge_detach(bridge); +} +EXPORT_SYMBOL(drm_encoder_cleanup_from); + static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr) { struct drm_encoder *encoder = ptr; diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h index 977a9381c8ba943b4d3e021635ea14856df8a17d..bafcabb242674880a97dfb62a50d93cc4d80c1d4 100644 --- a/include/drm/drm_encoder.h +++ b/include/drm/drm_encoder.h @@ -320,6 +320,7 @@ static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev, } void drm_encoder_cleanup(struct drm_encoder *encoder); +void drm_encoder_cleanup_from(struct drm_encoder *encoder, struct drm_bridge *bridge); /** * drm_for_each_encoder_mask - iterate over encoders specified by bitmask -- 2.34.1