From patchwork Fri Aug 9 15:34:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Ceresoli X-Patchwork-Id: 818179 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (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 B2F4E17552; Fri, 9 Aug 2024 15:35:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723217749; cv=none; b=nBDgvVC9tQuLvS1J92sqzxcUZdbECoD1j4q83DWovjld8ooTBRqVYom7nW5nBvnxnjJorA+Tz6qrW/CB43GNP6+oa0ZnS1emj33BTcfPOrEVyEMCqpotT3y1fM1wHsY5orVUWtxL9bkKEfvkg3pzeAb8t817yRcEeS/zkL0irxA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723217749; c=relaxed/simple; bh=tbi2GjX0sVPxeekko6WyWU769v76iroU9gpWVQtjZyo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jsZp88HGKe3YRl6V3M/S5PN/8pCkRAersKQThJwTgq+IvU9Dgh+zkvZmjbo9WGIv4HVHz9VqHQ58pWwwt0HbfMDbcJWi3Wt9BlO2lNJLfQETTlEqnd9WcpFC8x64Y7ye+xqZuYG0K6eKFR+Zy2gDSfLXODkR+8zBbtPuZP7upb0= 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=GVeTBtmv; arc=none smtp.client-ip=217.70.183.198 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="GVeTBtmv" Received: by mail.gandi.net (Postfix) with ESMTPSA id C76CFC0008; Fri, 9 Aug 2024 15:35:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1723217745; 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=zXfD1uIHQ08PVRbHD3ejH9ya7NUdvN1EDBI59inSFEs=; b=GVeTBtmva2pQ6cW8+vsqX1j6REQCjU2/HhSlW19/YcRgk8oKUHbUp+6jOwEcK0jPcatxeS zXQ1P//3trfX/mWnKp/Sqg1DOHUUDSX7Z5sOtLukQRgFTOTuw+GFenCzaNSUuoE+6HyZ8C Y+2hMsLCe6C3b7Qde26rEMsfu4dN13Xn2csE61uKDShoX5fsy9s+UZq1spd9GtIEz+oSwj fO+6t5PKd4brBVwZymLQRL7zuIPoScfTkQJfYIkKUjEsBT+pEgzZ7fLbJhRi4ZbkhlZvkN k3RGLAGo7+tor8VKbIuKs5G+iJxamBOLKh71Yfp2tf62P0JVykbViNFO3/d8Mg== From: Luca Ceresoli Date: Fri, 09 Aug 2024 17:34:51 +0200 Subject: [PATCH v3 3/7] drm/encoder: add drm_encoder_cleanup_from() Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240809-hotplug-drm-bridge-v3-3-b4c178380bc9@bootlin.com> References: <20240809-hotplug-drm-bridge-v3-0-b4c178380bc9@bootlin.com> In-Reply-To: <20240809-hotplug-drm-bridge-v3-0-b4c178380bc9@bootlin.com> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Saravana Kannan , Wolfram Sang , "Rafael J. Wysocki" Cc: Paul Kocialkowski , =?utf-8?q?Herv=C3=A9_Codina?= , Thomas Petazzoni , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-i2c@vger.kernel.org, Paul Kocialkowski , Luca Ceresoli X-Mailer: b4 0.14.0 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 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 8f2bc6a28482..472dfbefe296 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 977a9381c8ba..bafcabb24267 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